C Program to Concatenate Two Strings Without strcat

This C program concatenates two string without using string handling function strcat().

C Source Code: String Concatenation Without strcat()

#include<stdio.h>

int main()
{
 char str1[50], str2[50];
 int i, len=0;

 printf("Enter first string:\n");
 gets(str1);
 printf("Enter second string:\n");
 gets(str2);
 
 /* Calculating length of first string */
 for(i=0;str1[i]!='\0';i++)
 {
  len++;
 }
 
 /* Concatenating second string to first string */
 for(i=0;str2[i]!='\0';i++)
 {
  str1[len+i] = str2[i];
 }
 str1[len+i]='\0';
 printf("Concatenated string is: %s", str1);
 
 return 0;
}

Output

Enter first string:
Ram ↲
Enter second String:
Shyam ↲
Concatenated string is: RamShyam

Note: ↲ represents ENTER key is pressed.