C Program to compute the discount rate

C Program to calculate the discount percentage

This c program is used to compute the discount rate or discount percentage based on user inputs cost and sold amount of any products.

Discount Percentage Formula

Discount =  Cost Amount - Sold Amount
Discount Rate = (Discount * 100/Cost Amount)

C Program to find the discount percentage

#include<stdio.h>                                                               
                                                                                
void main()                                                                     
{                                                                               
  double cost, sold, discount, discount_per;                                    
  printf("Enter cost amount: ");                                                
  scanf("%lf", &cost);                                                          
  printf("Enter sold amount: ");                                                
  scanf("%lf", &sold);                                                          
                                                                                
  discount =  cost-sold;                                                        
  discount_per = ((discount *100)/cost);                                        
  printf("Discount Percentage: %lf\n", discount_per);                           
} 

Output:

$ cc discount-percentage.c 
$ ./a.out 
Enter cost amount: 5000
Enter sold amount: 4000
Discount Percentage: 20.000000

$ ./a.out 
Enter cost amount: 4500
Enter sold amount: 3750
Discount Percentage: 16.666667

C program to round decimal places of double value

This c program rounds up the decimal places of double value 'discount percentage' using %.2lf formatter.

#include<stdio.h>                                                                
                                                                                
void main()                                                                     
{                                                                               
  double cost, sold, discount, discount_per;                                    
  printf("Enter cost amount: ");                                                
  scanf("%lf", &cost);                                                          
  printf("Enter sold amount: ");                                                
  scanf("%lf", &sold);                                                          
                                                                                
  discount =  cost-sold;                                                        
  discount_per = ((discount *100)/cost);                                        
  printf("Discount Percentage: %.2lf\n", discount_per);                         
} 

Output:

$ cc discount-percentage.c 
$ ./a.out 
Enter cost amount: 4500
Enter sold amount: 3750
Discount Percentage: 16.67