## calculate compound interest:

Compound interest arises when interest is added to the principal, so that from that moment on, the interest that has been added also earns interest. This addition of interest to the principal is called compounding.

For Rs. 5000 at interest rate 10% every year, Amount with compound interest at end of first year is 5500. Amount with compound interest at end of second year is 6050 (5000 + 500 + 500 + 50 [interest on interest]) and at end of third year Amount with compound interest is 5000 + 500 x 3 + 50 x 2 + 50 + 5 = Rs. 6655

note: compound interest generated for first period of time ( year as per above example)
is always equal to simple interest for first period of time. From second period onwards compound interest varies as interest on interest adds up.

## write a C program to find compound interest without functionswrite a C program to calculate compound interest without functions / write a C program for calculating compound interest without functions #include<stdio.h> #include<conio.h> #include<math.h> void main() { float p,t,r; float i,compound,a; clrscr(); printf("...To calculate compound interest.....\t") printf("enter principal:\t"); scanf("%d",&p); printf("enter rate of interest:\t"); scanf("%d",&r); printf("enter time in years:\t"); scanf("%d",&t); if((p<1)||(t<1)||(r<1)) printf("invalid"); else { a=(float)p*(pow(1+r/100.0,t)); compound=a-p; printf("the compound interest is rs.%.2f",compound); } getch(); } OUTPUT: ...To calculate compound interest..... enter principal: 100 enter rate of interest: 10 enter time in years: 1 The compound interest is rs. 10 ## Write a C program to calculate compound interest using functionswrite a C program to find compound interest using functions / write a C program for calculating compound interest using functions #include<stdio.h> #include<conio.h> #include<math.h> void main() { float p,t,r; float i, compound ,a; clrscr(); printf("...To calculate compound interest.....\t") printf("enter principal:\t"); scanf("%d",&p); printf("enter rate of interest:\t"); scanf("%d",&r); printf("enter time in years:\t"); scanf("%d",&t); compound = ci( p, t, r ); printf("the compound interest is rs.%.2f", compound); } ci( int principal, int rate, int time) { if((prinipal<1)||(time<1)||(rate<1)) printf("invalid"); else { i=(principal*time*rate)/100.0; printf("The compound interest is rs.%.2f",i); int amount=(float)principal*(pow(1+rate/100.0,time)); return(amount-prinipal); } } OUTPUT1: ...To calculate compound interest..... enter principal: 200 enter rate of interest: 10 enter time in years: 1 The compound interest is rs. 20 run2: ...To calculate compound interest..... enter principal: 200 enter rate of interest: 10 enter time in years: 2 The compound interest is rs. 42 ## other related programswrite a program in c to find or calculate Simple interest WAP to calculate Simple interest using macros in c programming |

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