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Interview Question for Developer Program Engineers


Country: India



Comment hidden because of low score. Click to expand.
0
of 0 vote

What is the question?
Which company uses "void main" ?

think what happens printf tries to print a[3]

For illustrative purposes only:

#include <stdio.h>

        int main()
        {
            int i = 0, j = 0;
            char *a[10] = {"hi", "hello", "how"};

            for(j=3; j<10; j++) a[j]="";

            a[0] = "hey";

            for (i = 0; i < 10; i++)
	            printf("%s\n", a[i]);

            return 0;

        }

- S O U N D W A V E March 10, 2014 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

Interesting question!
Passing NULL pointer to printf("%s",s) causes undefined behavior. So it may up to the compiler decision...
prinf() without "\n" (newline) puts data into buffer and waits for all data to be printed, while with "\n", it prints immediately (?).

But I really don't know why and why not segmentation fault occurs. Any expert here?

- Anonymous March 10, 2014 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

a[3] is a garbage valued (because it is coming off stack) pointer to a char

when it's passed to printf, printf will try to access characters a[3][0] then a[3][1] ... etc. until some a[3][k] is the '\0' character (signalling end of string).

if you are lucky and say a[3][0] just happens to be '\0', then there is a[4] garbage pointer to deal with on next iteration of the loop

- S O U N D W A V E March 10, 2014 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

DId you guys even read the question?

The question is about removing \n from printf("%s\n").

- Anonymous March 10, 2014 | Flag
Comment hidden because of low score. Click to expand.
-1
of 1 vote

Do your own homework.

- Anonymous March 09, 2014 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

+1. This smells awful like a problem faced when trying to do homework.

To other/newcomers to the careercup site, please don't encourage questions like these and pollute the Questions page.

Please redirect them to the Forum page, where such questions are allowed.

- Anonymous March 10, 2014 | Flag
Comment hidden because of low score. Click to expand.
-1
of 1 vote

Try compiling with "-fno-builtin-printf"

- Anon March 10, 2014 | Flag Reply


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