c question

Question

#include<stdio.h>
main()
{
    int j=0;
    int i;
    for( i=0;i<100;i++)
    {
        j=j++;
    }
    printf("%d",j);
}

why o/p is zero??

Comments

answer is compiler dependent on gcc it is giving 0 and on turbo c it is giving 100.

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This program output will give the ans 0 try it as j=j+1 then it will give answer as 100. So it means that it only doing 0++ in gcc compiler

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https://gateoverflow.in/62411/undefined-behaviour-in-c check other examples for undefined behaviour.

Answer 1

Every time value of j taht is zero assign to itself j before the increment

j=j++;//at this line zero is  assign first then increment and every time j is assign by zero //

so the final output will be zero