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C Programming - Strings - Discussion

@ : Home > C Programming > Strings > Find Output of Program - Discussion

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"In the middle of difficulty lies opportunity."
- Albert Einstein
15. 

What will be the output of the program ?

#include<stdio.h>

int main()
{
    int i;
    char a[] = "\0";
    if(printf("%s", a))
        printf("The string is empty\n");
    else
        printf("The string is not empty\n");
    return 0;
}

[A]. The string is empty[B]. The string is not empty
[C]. No output[D]. 0

Answer: Option B

Explanation:

The function printf() returns the number of charecters printed on the console.

Step 1: char a[] = "\0"; The variable a is declared as an array of characters and it initialized with "\0". It denotes that the string is empty.

Step 2: if(printf("%s", a)) The printf() statement does not print anything, so it returns '0'(zero). Hence the if condition is failed.

In the else part it prints "The string is not empty".


Ravi Ranjan Kumar said: (Thu, Jan 26, 2012 03:22:29 AM)    
 
Please tell me why the printf() within the "if(printf("%s",str)" does not print anything in the above question.

Selvadinesh said: (Wed, Dec 12, 2012 02:34:52 PM)    
 
@Ravi.

Its because array is a group of consecutive elements terminated by "\0".

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