C Program to Concatenate Two Strings

In this example, we will concatenate two strings using multiple functions.

Concatenate Two Strings In C Programming

	
#include<stdio.h>

void main(void)
{
    char str1[25],str2[25];
    int i=0,j=0;
    printf("\nEnter First String:");
    gets(str1);
    printf("\nEnter Second String:");
    gets(str2);
    while(str1[i]!='\0')
    i++;
    while(str2[j]!='\0')
    {
        str1[i]=str2[j];
        j++;
        i++;
    }
    str1[i]='\0';
    printf("\nConcatenated String is %s",str1);
}
	

Output :

	
Enter First String:Hello
Enter Second String:World
Concatenated String is HelloWorld
	

Concatenate Two Strings with strcat() Funtion In C Programming

	
#include <stdio.h>
#include <string.h>
int main()
{
    char destination[] = "Hello ";
    char source[] = "World!";
    strcat(destination,source);
    printf("Concatenated String: %s\n", destination);
    return 0;
}
	

Output :

	
Concatenated String: Hello World!
	

concat() function is used for concatenate string and it's a in-built function provided by c programming. We must include <string.h> heder file to use this function.