Array problem

Hi, this is my first time posting here. So I'm working on this project for my final that is due in a few days for my C programming class. I have just one thing left. My program is a snack machine. The problem exists when the user puts in how much of something they want. Let's say I have 6 dollars and I want a quanity of 7 of an item (each item if 1 dollar) it says please reenter your choice but goes to the next item. I want it to reask for the same item. Sorry if I am doing something wrong. This is my source code.

Code:

/*
  Term Project I
  CSC 218, S1
  Spring, 2008
  Dr. Manki Min
  Nathan Nash
  1750669
*/

#include <stdio.h>   //header file
#include <stdbool.h> //header file
#include <stdlib.h>  //header file
#include <math.h>    //header file

int money, choice1; // declaration of variables
bool a = false; //bool statement
char candy[8][11] = {"snickers","mars", "hershey", "chips", "crackers", "cookies", "skittles", "gummybears"}; //snacks
int snacks[8]; // defined array for how many wanted
bool b = false; //bool statement

int main (void) //main program
{  // opening of snack machine
  system ( "clear" );  //clears screen
  printf("\n\t\t\tWelcome to Nate's Tummy Yummies!\n\n"); //Title of snack machine
 while (a == false) //loop statement
 {
  printf("\nPlease enter the amount of money you have in dollars.  Ex: 35 dollars = 35. "); //Statement about money
   scanf("%d", &money); //Enter the ammount of money you have
  
     printf("\nYou have entered $%d, is this correct? Type '1' for yes, '2' to return, or '4' to exit.  ", money);  //Asks user if ammount entered was correct.
     scanf("%d", &choice1); //Let's user confirm ammount or have a chance to go back
   
  if (choice1 == 1) // choices
    {
     printf("\nYou have $%d.\n", money); //States how much money the user has left
     printf("You will get to choose from snickers, mars, hershey, chips, crackers, cookies, skittles, and gummybears.\n\n"); //shows choices
     printf("Each item costs $1\n"); //display cost of each item
     a = true;  //continues on with program
    }
  else if (choice1 == 2) //no choice
    {
     a = false; //goes back to enter money
    } 
  else if (choice1 == 4) //choice to quit
  {
     return 0; //terminates program
  } 
  else //else statement
  {
    printf("\nInvalid choice.  Please try again.\n"); //invalid choice
    a = false; //invalid entry returns to choice
  }
  }
  
  int row; //define row
  int col; //define col
  int x;   //define x
  FILE* spOut; //used for opening file
  spOut = fopen("receipt.dat", "w"); //opens receipt.dat

  for (row = 0; row < 8; row++) //for statement with how many like of candy
  { 
 	if (money >= 0) //if money is greater than or equal to 0
	{ 
	  printf("\nHow many of the %s would you like? ", candy[row]); //asks for how many snacks
          scanf("%d", &snacks[row]); //stores users input for snacks
  	  
	  if (snacks[row] > money)
	  {
	    printf("\nYou don't have enough money please re-enter the amount you want.");

	  }
	  if (snacks[row] <= money)
	  {
	  fprintf(spOut, "\n%d %s ", snacks[row], candy[row]); //prints output to outside file
	  money = money - snacks[row]; //subtracts money
	  printf("\nYou have $%d remaining. ", money); //money remaining
	  }
  	}
  }
  for(row = 0; row < 8; row++) //for statement for how many wanted
  {
      printf("\nYou wanted %d", snacks[row]); //tell how many snacks wanted
      printf(" %s.", candy[row]); //name of candy
  }
  
  printf("\n\nYour receipt is printed on the file receipt.dat\n");  //tells user that file will be made
  printf("\nThank you for choosing Nate's Tummy Yummies!\n"); //closing statement

  fprintf(spOut, "\nThank you!"); //prints thanks you to outside file

  return 0; //End program
}

you have only 1 function - why so many global vars?

I want it to reask for the same item

use same loop idea you have with money asking question

This is my first C class. You mean just do another while type statement?

You mean just do another while type statement?

yes... if you want to repeate several statements - wrap them inside some loop

while seems to be a good choice here... but do{}while maybe even better - because you always want to execute the body at least once - and this is exactly what do..while does

Could someone type up what it should look like? I am having trouble at this.