Library Function strcat in String Class

February 1, 2023

Library Function strcat of string.h Header File

On this page we will discuss about library function strcat in string class which is used in C.The C header file string.h contains a set of functions that can be used for performing various manipulation operations on strings. The strcat function is used to join or to concatenate the two strings.

Library Function strcat in String Class used in C

In C programming language the strcat function is included in string.h header file.

The function appends the source string to the end of the destination string, overwriting the null character at the end of the destination string and adding a new null character at the end of the resulting concatenated string.

Note: In strcat function, the destination string must have enough space to hold the concatenated string. If the destination string does not have enough space, then the behaviour of strcat is undefined.

Declaration of strcat function

 char *strcat(char *destination, const char *source)

The strcat function can also be declared without using pointers as given below:

 strcat(destination,source);

Parameters of strcat function

The strcat function accepts two parameters which are source and destination.

Parameter	Description
source	It is a pointer to the source string that needs to be concatenated to the destination string.
destination	It is a pointer to the destination string which will be modified by the source string.

Return value of strcat function

The strcat function returns a pointer to the destination string. This is the same as the destination parameter that was passed to the function.

library function studio h clearerr

library function string h strcat

library function string h strcmp

library function string h strcpy

library function string h strlen

Implementation of Library Function string.h strcat

Example 1:

Run

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

int main() {
  
  // Initializing the two strings 
  char destination[20] = "PrepInsta";
  char source[10] = " Prime";

  // Concatenating the source string to the destination string
  char *result = strcat(destination, source);
  
  // Displaying the resultant string
  printf("Result: %s\n", result);

  return 0;
}

Output:

Result: PrepInsta Prime

Example 2:

Run

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

int main() {
  
  // Initialization of multiple strings
  char destination[50] = " ";
  char source1[10] = "PrepInsta";
  char source2[10] = " Prime";
  char source3[10] = " ";

  // Concatenating the source string to the destination string
  strcat(destination, source1);
  strcat(destination, source2);
  strcat(destination, source3);
  
  // Displaying the resultant string
  printf("%s\n", destination);

  return 0;
}

Output:

 PrepInsta Prime

Note In C, the strcat function is capable of concatenating strings only. It is not possible to use strcat function to concatenate other data types. If an attempt is made to concatenate a non-string value, then an error will occur.

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Library Function strcat in String Class

Library Function strcat of string.h Header File

Library Function strcat in String Class used in C

Declaration of strcat function

Parameters of strcat function

Return value of strcat function

Implementation of Library Function string.h strcat

Example 1:

Output:

Example 2:

Output:

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