Question

How to multiply two numbers without using the multiple operator (*) in Node.js

Answer 1

function multiply(a, b) {
    let mul = 0;
  
    // mul = a * b
    
    if (a == 0 || b == 0) {
        return 0;
    }
    
    for (let i = 1; i <= Math.abs(a); i++) {
        mul = mul + b;
    } 
    
    if (a < 0 && b < 0) {
        return Math.abs(mul);
    } else if (a < 0 || b < 0) {
        return -mul;
    }
    
    return mul;
}

const a = 4;
const b = 8;

console.log(a + " * " + b + " = " + multiply(a, b));

 
 
/*
run:
 
4 * 8 = 32
 
*/

 

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