Modulo in JavaScript - large number

Question

I try to calculate with JS\' modulo function, but don\'t get the right result (which should be 1). Here is a hardcoded piece of code.

var checkSum = 21050170         


        

Answer 1

Finally, my solution:

function modulo (divident, divisor) {
    cDivident = '';
    cRest = '';

    for each ( var cChar in divident ) {
        cOperator = cRest + '' + cDivident + '' + cChar;

        if ( cOperator < divisor ) {
            cDivident += '' + cChar;
        } else {
            cRest = cOperator % divisor;
            if ( cRest == 0 ) cRest = '';
            cDivident = '';
        }

    }

    return cRest;
}