How to Concatenate Multiple Strings in C?

How to Concatenate Multiple Strings in C?

Last Updated : 17 Jun, 2024

In C, concatenating strings means joining two or more strings end-to-end to form a new string. In this article, we will learn how to concatenate multiple strings in C.

Example:

Input:
char str1[50] = "Hello";
char str2[50] = " geeksforgeeks";

Output:
Hello geeksforgeeks!

Concatenating Strings in C

To concatenate strings in C, we can use the strcat function from the string.h library. The strcat function appends the source string to the destination string.

C Program to Concatenate Multiple Strings

The below example demonstrates the use of the strcat function to concatenate multiple strings in C.

C

// C program to concatenate multiple strings

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

int main()
{
    // creating string variables
    char str1[50] = "Hello";
    char str2[50] = " geeksforgeeks!";
    char str3[50] = " How are you?";

    printf("Initial strings:\n%s\n%s\n%s\n", str1, str2,
           str3);

    // Concatenating strings
    strcat(str1, str2);
    strcat(str1, str3);

    printf("String after concatenation: %s\n", str1);

    return 0;
}

Output

Initial strings:
Hello
 geeksforgeeks!
 How are you?
String after concatenation: Hello geeksforgeeks! How are you?

Time Complexity: O(n)
Auxiliary Space: O(1)

How to Concatenate Multiple Strings in C?

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