C | Operators | Question 23

Predict the output of following program?

# include <stdio.h>
int main()
{
    int x = 10;
    int y = 20;
    x += y += 10;
    printf (" %d %d", x, y);
    return 0;
}

(A) 40 20
(B) 40 30
(C) 30 30
(D) 30 40


Answer: (B)

Explanation: The main statement in question is “x += y += 10”. Since there are two += operators in the statement, associativity comes into the picture. Associativity of compound assignment operators is right to left, so the expression is evaluated as x += (y += 10).

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