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
Let’s use the following algorithm and program to concatenate or join two string using for loop, while loop, function and pointer 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
