How to do a program for reverse of string?

CODE

How to do a program for reverse of string?

//Write a program for reverse of string…

int main()

{

    char a[20],b[20];

    int i,c;

    printf("\n enter name:");

    gets(a);

    for(i=0;i<a[i]!='\0';i++);

    c=i-1;

    for(i=0;a[i]!='\0';i++)

    {

        b[c-i]=a[i];

    }

    b[i]='\0';

    for(i=0;b[i]!='\0';i++)

    {

        a[i]=b[i];

    }

    a[i]='\0';

    printf("\n reversed array:\n %s",a);

}

Output:

enter name: smile

 reversed array:

 elims