Algorithms Quiz | SP2 Contest 1 | Question 6

Predict the output of the below C program:

#include <stdio.h>

int main()
{
    int a = - -3;

    printf("a=%d", a);

    return 0;
}

(A) a=3
(B) a=-3
(C) a=2
(D) None of the above

Answer: (A)
Explanation: Notice the space between the two minus(-) operators. Here unary operation minus(-) is applied twice instead of the pre-decrement operator, we know in maths that minus*minus gives plus. Therefore, – -3 = -(-3) = 3.
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