Concatenating n characters from source string to destination string in C

Problem

Write a C program to concatenate n characters from source string to destination string using strncat library function

Solution

The strcat function

This function is used for combining or concatenating two strings.
The length of the destination string must be greater than the source string.
The resultant concatenated string will be in the source string.

Syntax

strcat (Destination String, Source string);

Example 1

#include <string.h>
main(){
   char a[50] = "Hello";
   char b[20] = "Good Morning";
   clrscr ( );
   strcat (a,b);
   printf("concatenated string = %s", a);
   getch ( );
}

Output

Concatenated string = Hello Good Morning

The strncat function

This function is used for combining or concatenating n characters of one string into another.
The length of the destination string must be greater than the source string.
The resultant concatenated string will be in the destination string.

Syntax

strncat (Destination String, Source string,n);

Example 2

#include <string.h>
main ( ){
   char a [30] = "Hello";
   char b [20] = "Good Morning";
   clrscr ( );
   strncat (a,b,4);
   a [9] = ‘\0’;
   printf("concatenated string = %s", a);
   getch ( );
}

Output

Concatenated string = Hello Good.

Example 3

#include<stdio.h>
#include<string.h>
void main(){
   //Declaring source and destination strings//
   char source[45],destination[50];
   //Reading source string and destination string from user//
   printf("Enter the source string :");
   gets(source);
   printf("Enter the destination string before :");
   gets(destination);
   //Concatenate all the above results//
   destination[2]='\0';
   strncat(destination,source,2);
   strncat(destination,&source[4],1);
   //Printing destination string//
   printf("The modified destination string :");
   puts(destination);
}

Output

Enter the source string :TutorialPoint
Enter the destination string before :C Programming
The modified destination string :C Tur

Bhanu Priya

Published on 06-Mar-2021 07:42:58

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