0x02-functions_nested_loops

0x02. C - Functions, nested loops

Learning Objectives At the end of this project, you are expected to be able to explain to anyone, without the help of Google:

• What are nested loops and how to use them
• What is a function and how do you use functions
• What is the difference between a declaration and a definition of a function
• What is a prototype
• Scope of variables
• What are the gcc flags -Wall -Werror -pedantic -Wextra -std=gnu89
• What are header files and how to to use them with #include

Tasks

0-putchar.c

Write a program that prints _putchar, followed by a new line.

• The program should return 0

1-alphabet.c

Write a function that prints the alphabet, in lowercase, followed by a new line.

• Prototype: void print_alphabet(void);
• You can only use _putchar twice in your code

2-print_alphabet_x10.c

Write a function that prints 10 times the alphabet, in lowercase, followed by a new line.

• Prototype: void print_alphabet_x10(void);
• You can only use _putchar twice in your code

3-islower.c

Write a function that checks for lowercase character.

• Prototype: int _islower(int c);
• Returns 1 if c is lowercase
• Returns 0 otherwise FYI: The standard library provides a similar function: islower. Run man islower to learn more.

4-isalpha.c

Write a function that checks for alphabetic character.

• Prototype: int _isalpha(int c);
• Returns 1 if c is a letter, lowercase or uppercase
• Returns 0 otherwise FYI: The standard library provides a similar function: isalpha. Run man isalpha to learn more.

5-sign.c

Write a function that prints the sign of a number.

• Prototype: int print_sign(int n);
• Returns 1 and prints + if n is greater than zero
• Returns 0 and prints 0 if n is zero
• Returns -1 and prints - if n is less than zero

6-abs.c

Write a function that computes the absolute value of an integer.

• Prototype: int _abs(int); FYI: The standard library provides a similar function: abs. Run man abs to learn more.

7-print_last_digit.c

Write a function that prints the last digit of a number.

• Prototype: int print_last_digit(int);
• Returns the value of the last digit

8-24_hours.c

Write a function that prints every minute of the day of Jack Bauer, starting from 00:00 to 23:59.

• Prototype: void jack_bauer(void);
• You can listen to this soundtrack while coding :)

9-times_table.c

Write a function that prints the 9 times table, starting with 0.

• Prototype: void times_table(void);
• Format: see example

10-add.c

Write a function that adds two integers and returns the result.

• Prototype: int add(int, int);

11-print_to_98.c

Write a function that prints all natural numbers from n to 98, followed by a new line.

• Prototype: void print_to_98(int n);
• Numbers must be separated by a comma, followed by a space
• Numbers should be printed in order
• The first printed number should be the number passed to your function
• The last printed number should be 98
• You are allowed to use the standard library

100-times_table.c

Write a function that prints the n times table, starting with 0.

• Prototype: void print_times_table(int n);
• If n is greater than 15 or less than 0 the function should not print anything
• Format: see example

101-natural.c

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Write a program that computes and prints the sum of all the multiples of 3 or 5 below 1024 (excluded), followed by a new line.

• You are allowed to use the standard library

102-fibonacci.c

Write a program that prints the first 50 Fibonacci numbers, starting with 1 and 2, followed by a new line.

• The numbers must be separated by comma, followed by a space ,
• You are allowed to use the standard library

103-fibonacci.c

Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89. By considering the terms in the Fibonacci sequence whose values do not exceed 4,000,000, write a program that finds and prints the sum of the even-valued terms, followed by a new line.

• You are allowed to use the standard library

104-fibonacci.c

Write a program that finds and prints the first 98 Fibonacci numbers, starting with 1 and 2, followed by a new line.

• The numbers should be separated by comma, followed by a space ,
• You are allowed to use the standard library
• You are not allowed to use any other library (You can’t use GMP etc…)
• You are not allowed to use long long, malloc, pointers, arrays/tables, or structures
• You are not allowed to hard code any Fibonacci number (except for 1 and 2)

***John 5:38