build-log/javascript/calculator/cal.js at master · thisal-d/build-log · GitHub

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let calOutput = document.getElementById("cal-output") ;

function addNumber(number){
    calOutput.textContent += number ;
}

function addOperand(operand){
    cal() ;
    let output = calOutput.textContent ;
    if (output[output.length-1]==" "){
        calOutput.textContent = output.substring(0,output.length-3) + operand ;
    }
    else{
        if (output!=""){
            calOutput.textContent += operand ;
        }
    }
}

function addPercentage(){
    let output = calOutput.textContent ;
    let operand = [" + " ," - " , " * " ," / "] ;
    let success = false ;
    for (let i=0 ;i<output.length ;i++){
        for (let i2=0 ;i2<operand.length ;i2++){
            if(output.substring(i,i+3)==operand[i2]){
                success = true ;
                break ;
            }
        }
    }
    if (success){
        console.log("%") ;
        if (output[output.length-1] != " " & output[output.length-1] != "%"){
            console.log("%") ;
            calOutput.textContent += "%" ;
        }
    }
}

function positiveNegative(){
    let output = calOutput.textContent ;
    let operand = [" + " ," - " , " * " ," / "] ;
    let calReq = false ;
    for (let i=0 ;i<output.length ;i++){
        for (let i2=0 ;i2<operand.length ;i2++){
            if(output.substring(i,i+3)==operand[i2]){
                calReq = true ;
                break ;
            }
        }
    }
    let success ;
    if (calReq){
        success = cal();
        if (success){
            output = calOutput.textContent ;
            output = Number(output) * -1 ;
            calOutput.textContent = output ;
        }
    }
    else{
        output = Number(output) * -1 ;
        calOutput.textContent = output ;
    }

    }

function removeText(){
    let output = calOutput.textContent ;
    if (output[output.length-1]==" "){
        calOutput.textContent = output.substring(0,output.length-3) ;
    }
    else{
        calOutput.textContent = output.substring(0,output.length-1) ;
    }

}

function addFloat(){
    output = calOutput.textContent ;
    let operand = [" + " ," - " , " * " ," / "] ;
    let data = [];
    let index = 0 ;
    let dataValid = false ;
    while(index<operand.length){
        data = output.split(operand[index]);
        if (data.length==2){
            dataValid = true ;
            break ;
        }
        index ++;
    }

    if (dataValid){
        num1 = data[0] ;
        num2 = data[1] ;
        let floatFound = false ;
        for (let i=0 ;i<num2.length ;i++){
            if(num2[i]=="."){
                floatFound = true;
                break ;
            }
        }

        if (floatFound==false){
            calOutput.textContent += "." ;
        }
    }

    else{
        num1 = output;
        let floatFound = false ;
        for (let i=0 ;i<num1.length ;i++){
            if(num1[i]=="."){
                floatFound = true ;
                break ;
            }
        }

        if (floatFound==false){
            calOutput.textContent += "." ;
        }
    }

}

function cal(){
    let processStr = calOutput.textContent ;
    console.log(processStr) ;
    let operand = [" + " ," - " , " * " ," / "] ;
    let data = [];
    let index = 0 ;
    let dataValid = false ;
    while(index<operand.length){
        data = processStr.split(operand[index]);
        if (data.length==2){
            dataValid = true ;
            break ;
        }
        index ++;
    }

    if (dataValid){
        let num1 = data[0].replace(" ","") ;
        let num2 = data[1].replace(" ","") ;


        if (num1!="" & num2!=""){
            num1 = Number(num1);
            for (let i=0 ;i<num2.length ;i++){
                if(num2[i] == "%"){
                    let percentage = Number(num2.substring(0,num2.length-1)) ;
                    if (index==0 | index==1){
                        num2 = num1/100*percentage ;
                    }
                    else{
                        num2 = percentage/100 ;
                    }

                }
            }

            num2 = Number(num2);

            let total;
            if(index==0){
                total = num1+num2 ;
            }
            else if(index==1){
                total = num1-num2 ;
            }
            else if(index==2){
                total = num1*num2 ;
            }
            else{
                total = num1/num2 ;
            }
            console.log(num1,operand[index],num2,"=",total);
            calOutput.textContent = total ;
            return true ;
        }
        else{
            return false}
    }
}


function clearCal(){
    calOutput.textContent = "" ;
    console.log("clear") ;
}