C Program to Calculate Compound Interest

C Program to Calculate Compound Interest

This c program is used to find the compound interest.

Compound Interest Algorithm

Total Amount = (principal amount * power(1+(rate per annum/ 100), year))
Compound Interest = Total Amount - Principal Amount

Compound Interest C Program

#include<stdio.h>  
#include<math.h>  
                                                             
                                                                                                                                                                                                                                                                          
void main()                                                                     
{                                                                               
  int p, r, y;                                                                  
  double total, ci;                                                             
  printf("Enter principal (p): ");                                              
  scanf("%d", &p);                                                              
  printf("Enter rate per annum (r): ");                                         
  scanf("%d", &r);                                                              
  printf("Enter number of years (y): ");                                        
  scanf("%d", &y);                                                              
                                                                                
  total = (double)p*(pow((1.0+(((double)r)/100)), y));                          
  printf("Total Amount: %lf\n", total);                                         
  ci = total - p;                                                               
  printf("Compuond interest: %lf\n", ci);                                       
}                                                                     

$ cc compount-interest.c -o a.out -lm
$ ./a.out 
Enter principal (p): 7500
Enter rate per annum (r): 4
Enter number of years (y): 2
Total Amount: 8112.000000
Compuond interest: 612.000000