RosettaCodeData/Task/Long-multiplication/JavaScript/long-multiplication-1.js

23 lines
855 B
JavaScript

function mult(strNum1,strNum2){
var a1 = strNum1.split("").reverse();
var a2 = strNum2.toString().split("").reverse();
var aResult = new Array;
for ( var iterNum1 = 0; iterNum1 < a1.length; iterNum1++ ) {
for ( var iterNum2 = 0; iterNum2 < a2.length; iterNum2++ ) {
var idxIter = iterNum1 + iterNum2; // Get the current array position.
aResult[idxIter] = a1[iterNum1] * a2[iterNum2] + ( idxIter >= aResult.length ? 0 : aResult[idxIter] );
if ( aResult[idxIter] > 9 ) { // Carrying
aResult[idxIter + 1] = Math.floor( aResult[idxIter] / 10 ) + ( idxIter + 1 >= aResult.length ? 0 : aResult[idxIter + 1] );
aResult[idxIter] %= 10;
}
}
}
return aResult.reverse().join("");
}
mult('18446744073709551616', '18446744073709551616')