What is the output of below program?
#include <stdio.h> int foo( int * a, int * b)
{ int sum = *a + *b;
*b = *a;
return *a = sum - *b;
} int main()
{ int i = 0, j = 1, k = 2, l;
l = i++ || foo(&j, &k);
printf ( "%d %d %d %d" , i, j, k, l);
return 0;
} |
(A) 1 2 1 1
(B) 1 1 2 1
(C) 1 2 2 1
(D) 1 2 2 2
Answer: (A)
Explanation: The control in the logical OR goes to the second expression only if the first expression results in FALSE. The function foo() is called because i++ returns 0(post-increment) after incrementing the value of i to 1. The foo() function actually swaps the values of two variables and returns the value of second parameter. So, values of variables j and k gets exchanged and OR expression evaluates to be TRUE.
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