Unexpected characters being printed in the end of string

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I solved a problem. In my IDE(codeblocks) code is working as it is expected. But the CodeForces judge showing unexpected characters in the end of string.

Input:
1010100
0100101

Output:
1110001�B�_v��iv��@���_v�

Ans: 1110001

What I have tried:

This is my Code:

#include<stdio.h>
#include<string.h>
int main(void)
{
    /*declaring variables*/
    char array[100], array1[100];
    char ans[100];
    
    /* taking two separate line strings*/
    gets(array);
    gets(array1);
    
    /*length of the two strings are equal*/
int length = strlen(array);

/*comparing individual characters of two strings*/
int i=0;
while(length--){
    if(array[i]==array1[i]){
        ans[i]='0';
    }else{
    ans[i]='1';
    }
        i++;
}

/*printing desired string*/
printf(ans);
    return 0;
}

There must be something that I am missing. Please help.

Posted 27-Mar-22 16:25pm

Jahirul Sarker

Updated 27-Mar-22 20:11pm

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Comments

Peter_in_2780 27-Mar-22 22:38pm

Do you understand how C marks the end of a string?

Luc Pattyn 28-Mar-22 0:13am

Is that a rhetorical question?\0

Peter_in_2780 28-Mar-22 0:59am

I wish it were!

2 solutions

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OriginalGriff · Accepted Answer · 2022-03-27T19:58:00

Solution 1

In C, a string doesn't really exist: it's an array of chars which is terminated by a null character: '\0'

If you omit the terminating null, there is no way to tell where your string was intended to end so printf just prints the content of memory - "random" data" - until it encounters a byte containing zero.

Posted 27-Mar-22 19:58pm

OriginalGriff

Comments

CPallini 28-Mar-22 2:11am

5.

CPallini · Accepted Answer · 2022-03-27T20:11:00

As others suggested (and Griff pointed out), in C you must zero-terminate strings, that is you must append the '\0' at the end of the string.
Try

C

#include <stdio.h>
#include <string.h>

int main(void)
{
  enum { SIZE = 100 };
  enum { IN1, IN2, OUT };

  /*declaring variables*/
  char array[3][SIZE];

  /* taking two separate line strings*/
  scanf("%s", array[IN1]);
  scanf("%s", array[IN2]);

  /* assuming the strings have the same length */
  size_t length = strlen(array[IN1]);



  for (size_t n = 0; n<length; ++n)
    array[OUT][n] = array[IN1][n] == array[IN2][n] ? '0' : '1';

  array[OUT][length] =  '\0';

  /*printing desired string*/
  printf("%s\n", array[OUT]);
  return 0;
}