Program to concatenate two strings

#include<stdio.h>

#include<string.h>

int main()

{

    char a[20],b[20];

    printf("Enter the  first string:");

    gets(a);

    printf("Enter the second string:");

    gets(b);

    strcat(a,b);

    printf("The concatenated string is %s.",a);

    return 0;

}