How To Concatenate Two Strings In C Without Using Strcat

In this tutorial, we are going to see how to concatenate two strings in C without using strcat. A string is a sequence of characters, enclosed in quotes (""), used to represent a string terminated by a null character ‘\0’ in C. If we try to concatenate two strings using the + operator, it will fail. The following example shows you how to concatenate two strings in C without using strcat.

 
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How To Concatenate Two Strings In C Without Using Strcat

#include <stdio.h>
#include <string.h>
 
int main()
{
  char str1[100], str2[100];
  int i, j;
 
  printf("Enter the first string: ");
  gets(str1);

  printf("Enter the second string: ");
  gets(str2);

  // To iterate the first string from beginning to end
  for (i = 0; str1[i]!='\0'; i++);
  
  // Concatenate Str2 with Str1  
  for (j = 0; str2[j]!='\0'; j++, i++)
  {
     str1[i] = str2[j];
  }
  str1[i] = '\0';

  printf("After the concatenation: %s\n", str1);
    
  return 0;
}

Output:

Enter the first string: Hello
Enter the second string: World
After the concatenation: HelloWorld

 
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