WAP in C to Concatenate strings using standard library functions.

//WAP in C to Concatenate strings using standard library functions

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

void main()
{

      int len1, len2, i;

      char string1[50],string2[50];

      clrscr();

       printf("Enter the first String\n");
       gets(string1);
       printf("\nEnter the second String\n");
       gets(string2);

       len1=strlen(string1); //calculating length of string1
       len2=strlen(string2); //calculating length of string2

       printf("\n\nString after concatenation is:\n ");

//code for string concatenation

       for(i=0;i<=len2;i++)
       {
            string1[len1+i]=string2[i]; //concatenating string1 and string2
       }

//OR

        string1=strcat(string1,string2); // built-in library function

        printf("%s",string1); //printing the concatenated string

      getch(); // for holding the console screen
}