C Program to concatenate two Strings using pointer

In this article, I will show you how you can write a C Program to concatenate two Strings using pointer. I will explain the algorithm, concepts and then help you to write C Program to concatenate two Strings using pointer.

1. Program Outline

In this program, we will take two Strings as input from the user. We will then concatenate those Strings using Pointer.
To write a C Program to concatenate two Strings using pointer. Open your favorite code editor and Let’s start writing C Program to concatenate two Strings using pointer.

2. Concepts

To write this C Program to concatenate two Strings using pointer, you need to learn the following concepts of C Programming:

  1. Input
  2. Pointer
  3. Increment/Decrement operator
  4. Output

3. Algorithm

To write this C program, follow this Algorithm:

Step 1: START
Step 2: Input the String
Step 3: Add Pointer
Step 4: Concatenate the String
Step 5: Output concatenated String
Step 6: STOP

4. Program

Here’s the C Program to concatenate two Strings using pointer:

#include <stdio.h>
#define MAX_SIZE 100
  
int main()
{
    char str1[MAX_SIZE], str2[MAX_SIZE];
    char * s1 = str1;
    char * s2 = str2;
  
    // Getting String as Input
    printf("Enter 1st string: ");
    gets(str1);
    printf("Enter 2nd string: ");
    gets(str2);
    while(*(++s1));
    while(*(s1++) = *(s2++));
  
    printf("Concatenated string: %s", str1);
    return 0;
}

5. Output

Here’s the output of the above C Program:

C Program to concatenate two Strings using pointer

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