C | Loops & Control Structure | Question 11

Output of following C program?

#include<stdio.h>
int main()
{
    int i = 0;
    for (printf("1st\n"); i < 2 && printf("2nd\n"); ++i && printf("3rd\n"))
    {
        printf("*\n");
    }
    return 0;
}

(A) 1st
2nd
*
3rd
2nd
*

(B) 1st
2nd
*
3rd
2nd
*
3rd

(C) 1st
2nd
3rd
*
2nd
3rd

(D) 1st
2nd
3rd
*
1st
2nd
3rd

Answer: (B)

Explanation: It is just one by one execution of statements in for loop.
a) The initial statement is executed only once.
b) The second condition is printed before ‘*’ is printed. The second statement also has short circuiting logical && operator which prints the second part only if ‘i’ is smaller than 2
b) The third statement is printed after ‘*’ is printed. This also has short circuiting logical && operator which prints the second part only if ‘++i’ is not zero.

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