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Subtract using plus operator only

Solution: Since a-b = a + (-b),
this problem is easy if we can find negative of a number using only the plus operator.

Here is how to do it:
int negate(int num)
    int minusA = 0;
    int decrementUnit = num < 0 ? 1 : -1;  
    while (num != 0)
        minusA += decrementUnit;
        num += decrementUnit;
    return minusA;

int subtract (int a, int b)
    return a + negate(b);
Execution for negate(5)
minusA decrementUnit num

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Site Owner: Sachin Goyal