C Program to Concatenate Two Strings Using Pointers

In this tutorial you will learn about the C Program to Concatenate Two Strings Using Pointers and its application with practical example.

In this tutorial, we will learn to create a C program that will Concatenate Two Strings Using Pointers in C programming.

Table Of Contents−

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C programming topics:

Operators in C Programming.

Basic Input and Output function in C Programming.
Basic C programming.
While loop in c programming.

Concatenate Two Strings Using Pointers

As we all know the String is a collection of character data types. In strings, only one variable is declared which can store multiple values. First will take the number of elements of string 1 from the user. Then will take the number of elements of string 2 from the user. Then will take the elements from the user for string 1 and as well as for string 2. And concatenate them using the pointer.

With the help of this program, we can Concatenate Two Strings Using Pointers.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input number from the user.

3. Adding the given sting to pointers.

4. Passing those variables to while loop.

5. Using the those while loop one by one to add the strings.

6. Printing the result words.

1. Declaring the variables for the program.

2. Taking the input number from the user.

3. Adding the given sting to pointers.

4. Passing those variables to while loop.

5. Using the those while loop one by one to add the strings.

6. Printing the result words.

Program to Concatenate Two Strings Using Pointers:-

#include <stdio.h>  

int main()  

{
  //Declaring the required variables
  char string1[20]; // declaration char array1   
  char string2[20]; // declaration char array2   
  int i=0,j=0; // integer variables declaration 
  char *str1; // of char pointer declaration
  char *str2;  // char pointer  declaration
  str1=string1;  
  str2=string2;  
  
  //Taking Input From the user
  printf("Enter the first string\n");  
  scanf("%s",string1);  
  printf("\nEnter the second string\n");  
  scanf("%s", string2);  
  while(string1[i]!='\0')  
  {  
     ++str1;  
     i++;  
  }  
  
  while(string2[j]!='\0')  
  {  
      *str1=*str2;  
      str1++;  
      str2++;  
      j++;  
  }  
  printf("The concatenated string is %s",string1);  
  
    return 0;  
}

#include <stdio.h>

int main()

{

//Declaring the required variables

char string1[20]; // declaration char array1

char string2[20]; // declaration char array2

int i=0,j=0; // integer variables declaration

char *str1; // of char pointer declaration

char *str2; // char pointer declaration

str1=string1;

str2=string2;

//Taking Input From the user

printf("Enter the first string\n");

scanf("%s",string1);

printf("\nEnter the second string\n");

scanf("%s", string2);

while(string1[i]!='\0')

{

++str1;

i++;

}

while(string2[j]!='\0')

{

*str1=*str2;

str1++;

str2++;

j++;

}

printf("The concatenated string is %s",string1);

return 0;

}

Output:-

The above program we have first initialize the required variable.

string1[20] = it will hold the string value.
string2[20] = it will hold the string value.
i = it will hold the integer value.

j = it will hold the integer value.
*str1 = pointer type variable 1.
*str2 = pointer type variable 2.

Input strings from the user.

While loop body for concatenating the strings using the pointers and printing the concatenated string.

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C Program to Concatenate Two Strings Using Pointers