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C | Operators | Question 27

  • Difficulty Level : Hard
  • Last Updated : 28 Jun, 2021

Predict the output of following C program




#include <stdio.h>
int main()
{
    int i = 0;
    do
    {
        printf("GeeqsQuiz ");
        i = i++;
    }
    while (i < 5);
    return 0;
}

(A) GeeqsQuiz GeeqsQuiz GeeqsQuiz GeeqsQuiz GeeqsQuiz
(B) Infinite time GeeksQuiz
(C) Undefined Behavior


Answer: (C)

Explanation: The below statement causes undefined behavior.

 i = i++;

See https://www.geeksforgeeks.org/sequence-points-in-c-set-1/ for details.

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