Answer to Question #302967 in C for Sushma

Question

Big-Bazaar wants an application for Billing.

Biller will enter the following details

Type of customer ( ‘R’ - Regular, ‘S’ - Special),

Product number,

Product cost per unit (greater than 10) and

Quantity purchased.(between 1 and 100)

Application should not accept any wrong entry other than as specified above.

Discount offered by shopping Mall

Gives 10% discount for Special customers.

If total billing amount is more than 1000, additional 5% discount is applied.

Application should apply all possible discount and Display Final Bill amount

All variables must have meaningful names(readable)

Variables should have proper data-types

Answer 1

#include <stdio.h>

struct customer {
  char type;
  int product_number;
  int cost_per_unit;
  int quantity;
};

int read_char(const char *msg,
              char c[], 
              int n, 
              char *dest)
{
  printf("%s: ", msg);
  scanf("%c", dest);
  int bool = 0;
  for (int i = 0; i < n; i++) {
    if (strcmp(c[i], dest) == 0) {
      bool = 1;
    }
  }
  return bool;
}

int read_int(const char *msg,
             int min, 
             int max,
             int *dest)
{
  printf("%s: ", msg);
  scanf("%d", dest);
  return min <= *dest && *dest <= max;
}

int main() {
  char type[2] = {'R', 'S'};

  struct customer cm;
  
  while (!read_char("Type", type, 2, &cm.type));
  while (!read_int("Product number", 0, INT_MAX, &cm.product_number));
  while (!read_int("Product cost per unit", 10, INT_MAX, &cm.cost_per_unit));
  while (!read_int("Quantity",  1, 100, &cm.quantity));

  if (cm.type == 'R') {
    cm.cost_per_unit = cm.cost_per_unit - cm.cost_per_unit / 10;
  }
  
  printf("%d", cm.cost_per_unit * cm.quantity);

  return 0;
}