C Program to Concatenate Two Strings

C Program to Concatenate Two Strings

C program to concatenate or join to string; Through this tutorial, we will learn how to concatenate or join two string using for loop, while loop, function and pointer in c program.

Programs and Algorithm to Concatenate Two Strings in C

  • Algorithm To Concatenate Two Strings
  • C program to Concatenate Two Strings using For Loop
  • C program to Concatenate Two Strings While Loop
  • C program to Concatenate Two Strings using Function
  • C program to Concatenate Two Strings uisng Pointer

Algorithm To Concatenate Two Strings

Use the following algorithm to write a program concatenate or join two string; as follows:

  • START
  • Step 1 -> Take two string as str1 and str2.
  • Step 2 -> Move to the last position of first string let it be i.
  • Step 3 -> Now Loop over second string with j = 0
  • Assign the character str1[i] = str2[j]
  • Increment i and j and repeat till the last element of j.
  • End Loop
  • Step 3 -> Print str1.
  • STOP

C program to Concatenate Two Strings using For Loop

/* C program to Concatenate Two Strings without using strcat() */

#include <stdio.h>
#include <string.h>
 
int main()
{
  	char Str1[100], Str2[100];
  	int i, j;
 
  	printf("\n Please Enter the First String :  ");
  	gets(Str1);
  	
  	printf("\n Please Enter the Second String :  ");
  	gets(Str2);

        // To iterate First String from Start to end  
  	for (i = 0; Str1[i]!='
/* C program to Concatenate Two Strings without using strcat() */
#include <stdio.h>
#include <string.h>
int main()
{
char Str1[100], Str2[100];
int i, j;
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
// To iterate First String from Start to end  
for (i = 0; Str1[i]!='\0'; i++);
// Concatenating Str2 into Str1  	
for (j = 0; Str2[j]!='\0'; j++, i++)
{
Str1[i] = Str2[j];
}
Str1[i] = '\0';
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
'; i++); // Concatenating Str2 into Str1 for (j = 0; Str2[j]!='
/* C program to Concatenate Two Strings without using strcat() */
#include <stdio.h>
#include <string.h>
int main()
{
char Str1[100], Str2[100];
int i, j;
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
// To iterate First String from Start to end  
for (i = 0; Str1[i]!='\0'; i++);
// Concatenating Str2 into Str1  	
for (j = 0; Str2[j]!='\0'; j++, i++)
{
Str1[i] = Str2[j];
}
Str1[i] = '\0';
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
'; j++, i++) { Str1[i] = Str2[j]; } Str1[i] = '
/* C program to Concatenate Two Strings without using strcat() */
#include <stdio.h>
#include <string.h>
int main()
{
char Str1[100], Str2[100];
int i, j;
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
// To iterate First String from Start to end  
for (i = 0; Str1[i]!='\0'; i++);
// Concatenating Str2 into Str1  	
for (j = 0; Str2[j]!='\0'; j++, i++)
{
Str1[i] = Str2[j];
}
Str1[i] = '\0';
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
'; printf("\n String after the Concatenate = %s", Str1); return 0; }

The output of the above c program; as follows:

Please Enter the First String :  hello
Please Enter the Second String :  world
String after the Concatenate = helloworld

C program to Concatenate Two Strings While Loop

#include <stdio.h>
#include <string.h>
 
int main()
{
  	char Str1[100], Str2[100];
  	int i, j;
 
  	printf("\n Please Enter the First String :  ");
  	gets(Str1);
  	
  	printf("\n Please Enter the Second String :  ");
  	gets(Str2);
 
  	i = 0;
	while( Str1[i]!='
#include <stdio.h>
#include <string.h>
int main()
{
char Str1[100], Str2[100];
int i, j;
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
i = 0;
while( Str1[i]!='\0')
{
i++;
}
j = 0;
while( Str2[j]!='\0')
{
Str1[i] = Str2[j];
i++;
j++;
}
Str1[i] = '\0';
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
') { i++; } j = 0; while( Str2[j]!='
#include <stdio.h>
#include <string.h>
int main()
{
char Str1[100], Str2[100];
int i, j;
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
i = 0;
while( Str1[i]!='\0')
{
i++;
}
j = 0;
while( Str2[j]!='\0')
{
Str1[i] = Str2[j];
i++;
j++;
}
Str1[i] = '\0';
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
') { Str1[i] = Str2[j]; i++; j++; } Str1[i] = '
#include <stdio.h>
#include <string.h>
int main()
{
char Str1[100], Str2[100];
int i, j;
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
i = 0;
while( Str1[i]!='\0')
{
i++;
}
j = 0;
while( Str2[j]!='\0')
{
Str1[i] = Str2[j];
i++;
j++;
}
Str1[i] = '\0';
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
'; printf("\n String after the Concatenate = %s", Str1); return 0; }

The output of the above c program; as follows:

Please Enter the First String :  hello
Please Enter the Second String :  dear
String after the Concatenate = hellodear

C program to Concatenate Two Strings using Function

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

void concatenate(char [], char []); 

int main()
{
  	char Str1[100], Str2[100];
 
  	printf("\n Please Enter the First String :  ");
  	gets(Str1);
  	
  	printf("\n Please Enter the Second String :  ");
  	gets(Str2);
  	
  	concatenate(Str1, Str2);

  	printf("\n String after the Concatenate = %s", Str1);
  	
  	return 0;
}

void concatenate(char s1[], char s2[])
{
	int i, j;
	
	i = 0;
	while( s1[i]!='
#include <stdio.h>
#include <string.h>
void concatenate(char [], char []); 
int main()
{
char Str1[100], Str2[100];
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
concatenate(Str1, Str2);
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
void concatenate(char s1[], char s2[])
{
int i, j;
i = 0;
while( s1[i]!='\0')
{
i++;
}
j = 0;
while( s2[j]!='\0')
{
s1[i] = s2[j];
i++;
j++;
}
s1[i] = '\0';
}
') { i++; } j = 0; while( s2[j]!='
#include <stdio.h>
#include <string.h>
void concatenate(char [], char []); 
int main()
{
char Str1[100], Str2[100];
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
concatenate(Str1, Str2);
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
void concatenate(char s1[], char s2[])
{
int i, j;
i = 0;
while( s1[i]!='\0')
{
i++;
}
j = 0;
while( s2[j]!='\0')
{
s1[i] = s2[j];
i++;
j++;
}
s1[i] = '\0';
}
') { s1[i] = s2[j]; i++; j++; } s1[i] = '
#include <stdio.h>
#include <string.h>
void concatenate(char [], char []); 
int main()
{
char Str1[100], Str2[100];
printf("\n Please Enter the First String :  ");
gets(Str1);
printf("\n Please Enter the Second String :  ");
gets(Str2);
concatenate(Str1, Str2);
printf("\n String after the Concatenate = %s", Str1);
return 0;
}
void concatenate(char s1[], char s2[])
{
int i, j;
i = 0;
while( s1[i]!='\0')
{
i++;
}
j = 0;
while( s2[j]!='\0')
{
s1[i] = s2[j];
i++;
j++;
}
s1[i] = '\0';
}
'; }

The output of the above c program; as follows:

Please Enter the First String :  hello
Please Enter the Second String :  world
String after the Concatenate = helloworld

C program to Concatenate Two Strings uisng Pointer

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

int main()
{
  	char Str1[100], Str2[100];
  	char *s1 = Str1;
	char *s2 = Str2;
 
  	printf("\n Please Enter the First String :  ");
  	gets(Str1);
  	
  	printf("\n Please Enter the Second String :  ");
  	gets(Str2);
  	
  	while(* ++s1);
  	
  	while(*(s1++) = (*s2++)); 
  	
  	printf("\n String after the Concatenate = %s", Str1);
  	
  	return 0;
}

The output of the above c program; as follows:

Please Enter the First String :  hello
Please Enter the Second String :  world
String after the Concatenate = helloworld

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AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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