C program to concatenate strings

C programming code

#include <stdio.h>
#include <string.h>
 
int main()
{
   char a[100], b[100];
 
   printf("Enter the first string\n");
   gets(a);
 
   printf("Enter the second string\n");
   gets(b);
 
   strcat(a,b);
 
   printf("String obtained on concatenation is %s\n",a);
 
   return 0;
}

Download String Concatenation program.

Output of program:

String concatenation without strcat

#include <stdio.h>
 
void concatenate_string(char*, char*);
 
int main()
{
    char original[100], add[100];
 
    printf("Enter source string\n");
    gets(original);
 
    printf("Enter string to concatenate\n");
    gets(add);
 
    concatenate_string(original, add);
 
    printf("String after concatenation is \"%s\"\n", original);
 
    return 0;
}
 
void concatenate_string(char *original, char *add)
{
   while(*original)
      original++;
 
   while(*add)
   {
      *original = *add;
      add++;
      original++;
   }
   *original = '\0';
}