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【通信软件技术（C++版）】增加PPT课件与课件参考代码
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‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_4/1.c‎

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#include <stdio.h>
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int main(void)
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{
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static const char *year_name[] = {"鼠", "牛", "虎", "兔",
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"龙", "蛇", "马", "羊",
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"猴", "鸡", "狗", "猪"};
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printf("%s\n", year_name[2 + (29 % 12)]);
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_4/2.c‎

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#include <stdio.h>
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#include <stdint.h>
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typedef struct Calc {
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size_t states;
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size_t now_state;
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double sum;
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} Calc;
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double func(Calc* calc, int a, int b)
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{
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if (calc->now_state >= calc->states) {
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return 0.0;
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}
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calc->now_state++;
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calc->sum += (double)a / (double)b + func(calc, b, a + b);
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}
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int main(void)
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{
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int n;
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__attribute__((unused)) int ret = scanf("%d", &n);
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Calc ans = {0};
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ans.states = n;
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func(&ans, 1, 1);
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printf("%lf\n", ans.sum);
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_4/3.c‎

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#include <stdio.h>
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int generateStateNum(int a, int state)
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{
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int sum = 0;
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int ret = 1;
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for (int i = 1; i <= state; i++) {
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sum += a * ret;
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ret *= 10;
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}
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return sum;
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}
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int func(int a, int state)
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{
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int sum = 0;
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for (int i = 1; i <= state; i++) {
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sum += generateStateNum(a, i);
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}
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return sum;
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}
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int main(void)
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{
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int a, state;
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__attribute__((unused)) int ret = scanf("%d%d", &a, &state);
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printf("%d\n", func(a, state));
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_4/4.c‎

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#include <stdio.h>
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#include <string.h>
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#define countof(array) (sizeof(array) / sizeof(array[0]))
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int main(void)
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{
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char str[9999];
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__attribute__((unused)) char* dummy_ptr = fgets(str, countof(str), stdin);
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int upper = 0, lower = 0;
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for (int i = 0; i < strlen(str); i++) {
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const char ch = str[i];
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if (ch >= 'a' && ch <= 'z') {
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lower++;
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}
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if (ch >= 'A' && ch <= 'Z') {
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upper++;
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}
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}
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printf("Upper: %d, Lower: %d\n", upper, lower);
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_4/5.c‎

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#include <stdio.h>
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#include <string.h>
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#define countof(array) (sizeof(array) / sizeof(array[0]))
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char toUpper(char* ch)
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{
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if (*ch >= 'a' && *ch <= 'z') {
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*ch -= 'a' - 'A';
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}
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}
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int main(void)
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{
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char str[9999];
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__attribute__((unused)) char* dummy_ptr = fgets(str, countof(str), stdin);
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toUpper(&str[0]);
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const int len = strlen(str);
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for (int i = 0; i < len; i++) {
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if (str[i] == ' ') {
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toUpper(&str[i + 1]);
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}
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}
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printf("%s", str);
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_6/1.c‎

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#include <stdio.h>
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#include <time.h>
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#include <unistd.h>
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#include <stdlib.h>
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#define FILE_NAME "test.txt"
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#define MY_NAME "your_name"
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#define MY_ID "12345678"
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int main(void)
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{
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if (access(FILE_NAME, 0) != 0) {
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if (system("touch " FILE_NAME) != 0) {
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printf("Error: failed to create file!");
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return 1;
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}
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}
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FILE* stream = fopen(FILE_NAME, "w");
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if (stream == NULL) {
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printf("Error: Failed to open file " FILE_NAME "!\n");
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return 1;
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}
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fprintf(stream, "Name: " MY_NAME "\n");
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fprintf(stream, "Id: " MY_ID "\n");
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fprintf(stream, "Time: ");
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time_t time_stamp;
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struct tm* time_info;
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time(&time_stamp);
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time_info = localtime(&time_stamp);
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const char* week[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
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const int year = time_info->tm_year + 1900;
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const int month = time_info->tm_mon + 1;
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const int day = time_info->tm_mday;
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const int week_num = time_info->tm_wday;
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const int hour = time_info->tm_hour;
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const int min = time_info->tm_min;
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const int sec = time_info->tm_sec;
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fprintf(stream, "%d/%d/%d %s %d:%d:%d\n", year, month, day, week[week_num], hour, min, sec);
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fclose(stream);
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_6/2.c‎

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#include <stdio.h>
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#include <time.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#define FILE_NAME "test.txt"
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int main(void)
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{
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pid_t pid = fork();
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if (pid == -1) {
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printf("Error: failed to fork!\n");
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return 1;
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}
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if (pid == 0) {
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printf("Sub process start.\n");
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sleep(10);
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if (access(FILE_NAME, 0) != 0) {
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printf("Error: file " FILE_NAME "does not exist!\n");
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return 1;
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}
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FILE *stream = fopen(FILE_NAME, "r");
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if (stream == NULL) {
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printf("Error: Failed to open file " FILE_NAME "!\n");
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return 1;
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}
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char buffer[100];
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size_t index = 0U;
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do {
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__attribute__((unused)) int ret = fscanf(stream, "%c", &buffer[index]);
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index++;
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} while(buffer[index - 1] != EOF);
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printf("%s\n", buffer);
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fclose(stream);
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}
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else {
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printf("Sub process pid=%d\n", pid);
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int status;
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wait(&status);
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}
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_8/client.c‎

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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include "fifo_def.h"
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#define TX_FIFO_NAME "client_to_server"
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#define RX_FIFO_NAME "server_to_client"
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int main(void)
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{
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if (access(FIFO_DIR, F_OK) != 0) {
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printf("Fifo dir not exists, now crerate it.\n");
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__attribute__((unused)) int ret = system("mkdir " FIFO_DIR);
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}
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int err = mkfifo(FIFO_DIR TX_FIFO_NAME, 0666);
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if (err == -1) {
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fprintf(stderr, "Failed to create fifo " TX_FIFO_NAME "! Error Code: %d\n", err);
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return 1;
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}
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printf("finished to create fifo " TX_FIFO_NAME ".\n");
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printf("waitting for " RX_FIFO_NAME "...\n");
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while (access(FIFO_DIR RX_FIFO_NAME, F_OK) != 0) {
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}
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printf(RX_FIFO_NAME " created.\n");
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int rx_fifo = open(FIFO_DIR RX_FIFO_NAME, O_RDONLY);
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if (rx_fifo == -1) {
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fprintf(stderr, "Failed to open fifo " RX_FIFO_NAME "! ErrorCode: %d\n", rx_fifo);
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unlink(FIFO_DIR TX_FIFO_NAME);
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return 1;
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}
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printf("Fininshed to open fifo " RX_FIFO_NAME ".\n");
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int tx_fifo = open(FIFO_DIR TX_FIFO_NAME, O_WRONLY);
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if (tx_fifo == -1) {
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fprintf(stderr, "Failed to open fifo " TX_FIFO_NAME "! ErrorCode: %d\n", tx_fifo);
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unlink(FIFO_DIR TX_FIFO_NAME);
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close(rx_fifo);
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return 1;
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}
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printf("Finished to open fifo " TX_FIFO_NAME ".\n");
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char rx_buffer[256], tx_buffer[256];
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while (true) {
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int size = read(rx_fifo, rx_buffer, sizeof rx_buffer / sizeof rx_buffer[0] - 1);
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rx_buffer[size] = '\0';
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printf("Readden buffer: %s, size = %d\n", rx_buffer, size);
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if (strcmp(rx_buffer, "esc") == 0) {
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break;
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}
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printf("Input message: ");
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fflush(stdin);
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__attribute__((unused)) int ret = scanf("%s", tx_buffer);
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size = write(tx_fifo, tx_buffer, strlen(tx_buffer));
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printf("Written buffer: %s, size = %d\n", tx_buffer, size);
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if (strcmp(tx_buffer, "esc") == 0) {
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break;
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}
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}
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close(rx_fifo);
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close(tx_fifo);
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unlink(FIFO_DIR TX_FIFO_NAME);
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return 0;
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}

‎课程目录/通信软件技术（C++版）/PPT课件/课后作业参考代码/chapter_8/fifo_def.h‎

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#pragma once
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#ifndef FIFO_DEF_H
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#define FIFO_DEF_H
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#define FIFO_DIR "./fifos/"
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#endif // !FIFO_DEF_H

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