C Program to Swap String

   #include<stdio.h>
   #include<string.h>
   #include<malloc.h>
   #include<conio.h>
   main()
   {
     char first[100], second[100], *temp;
     printf("Enter the first string ");
     gets(first);
     printf("Enter the second string ");
     gets(second);
     printf("\nBefore Swapping\n");
     printf("First string: %s\n",first);
     printf("Second string: %s\n\n",second);
     temp = (char*)malloc(100);
     strcpy(temp,first);
     strcpy(first,second);
     strcpy(second,temp);
     printf("After Swapping\n");
     printf("First string: %s\n",first);
     printf("Second string: %s\n",second);
     getch();
     return 0;
   }