Question

How to multiply two numbers recursively without using multiplication, division, bitwise and loops in Dart

Answer 1

int multiply(int x, int y) {
    if (y > 0) {
        return (x + multiply(x, y - 1));
    }
    if (y < 0) {
        return -multiply(x, -y);
    }
    
    return 0;
}

void main() {
    print("3 * 7 = " + multiply(3, 7).toString());
    print("3 * 0 = " + multiply(3, 0).toString());
    print("0 * 3 = " + multiply(0, 3).toString());
    print("3 * -5 = " + multiply(3, -5).toString());
    print("-3 * 6 = " + multiply(-3, 6).toString());
}




/*
run:

3 * 7 = 21
3 * 0 = 0
0 * 3 = 0
3 * -5 = -15
-3 * 6 = -18

*/

 

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