String concatenation in C programming language using strcat & pointers. This is to concatenate the given input strings as one. It is a simple concatenation source code that generates the final output.

Here we have included the 2 example programs. They are,

• String concatenation using strcat,
• String concatenation using pointers

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STRING CONCATENATION IN C

This C program is used to concatenate the two string values into the third string and print the value of string and combined two strings by using the strcat function & pointers. The header file is #include<string.h>. For example first value is ‘string’ and second value is ‘concatenation’ after strcat it will concatenate and stored in third value as ‘string concatenation’.

• String is palindrome or not in C
• Matrix multiplication program in C

String concatenation codes:

1) C program for string concatenation using strcat function.

//Header files
#include <stdio.h>
#include <string.h>
int main()
{
   //Program variable
   char b[50], c[50];
   printf("Enter the first value of string\n");//Display function
   gets(b);//Getting input function
   printf("Enter the second value of string\n");
   gets(b);
   strcat(b,c);//concatenation function
   printf("After string  concatenation is %s\n",b);
   return 0;
}

2) Program in string concatenation using pointers

//Header files
#include<stdio.h>
#include<conio.h>
char *xs(char*,char*);//Global variable
void main()
{
char *s4,*s5,*s6;//Program variable
clrscr();
puts("\t enter the first value of string:\n");
gets(s4);
puts("\t enter the second value of string:");
gets(s5);
s6=xs(s4,s5);
printf("after concatenation of string is %s",s6);
getch();
}
char *xs(char *s1,char *s2)
{
	char *p=s1;
	/*int j,h=0;
	while(*(s1+h)!='\0')
	{
		h++;
	}
	j=h;
	h=0;
	while(*(s2+h)!='\0')
	{
		*(s1+j)=*(s2+h);
		h++;
		j++;
	} */
	while(*s1!='\0')
		s2++;
	while(*s1!='\0')
	{
		*s1=*s2;
		s1++;
		s2++;
	}
	*s4='\0';
	//fs4--;
	return (p);
}