Ctype.h problem?

I want to make sure that my user only enters a numbered response and if not then it goes back to asking the main question. I know goto is out of the question and duplicity of any kind is sloppy code. So how would i go about doing this please. I think i need somehting in the ctype.h right?

Code:

         /* guessing game program
* (c) 2003 practical applications

* To be refactored including:

* user input validation on scanf()

* calling only one function in main()

* preprocessor directives validating and executing platform
  specific code

* srand to generate better random numbers */

/* the game */


#include <stdio.h>
#define RUNNING 1



int main()

{
    int number;int guess;int tries = 0;
    char name[15];


    system("TITLE Stupid guessing game");
    printf("Hey, whats your name?");
    gets(name); /* in case it is alpha numeric */

    system("cls");
    printf("Hey %s, we are gonna play a game\n\n", name);
    system("pause");
    system("cls");
    system("COLOR 74");



    while(RUNNING)
            {
            number = rand() % 100 + 1;
            printf("guess a number between 1 and 100: ");
            gets(guess);  /* works better but still have a warning */
            tries++;
        
            if(guess > number)

                printf("too high. The number was %d\n", number);
                
                else if(guess < number)
                printf("too low. The number was %d\n", number);
        
                else if(guess == number)
        		
                printf("perfect you only need %d tries to guess!\007\007\007\n", tries);

             }


        


return 0;
system("PAUSE");

}

Use fgets( ) and then sscanf( ), and then just check the return code from sscanf( ).