**Introduction**

This program will calculate simple interest and the final amount on entered given amount. The first program calculates interest for 1 year @ 9% p.a. which makes it non-flexible. The second calculates for 2 years which is also non-flexible.The third one is for 3 years which is not flexible. But the next one is little flexible which calculates for given number of years. The last one is most flexible due to it calculation of interest on given years and given rate. You can expand the programs by taking more number of years and different rates. Go enjoy the program. Lets begin……

**Program to calculate simple interest for 1 year.**

#include<iostream.h> #include<conio.h> void main() { //clear the screen. clrscr(); //declare variable type float float a,i,fa; //Input amount the save it in 'a' cout<<"Enter the amount"<<endl; cin>>a; //calculate interest and final amount and save them in 'i' and 'fa' i=a*9/100; fa=a+i; //show the output cout<<"Interest @ 9% for 1yr. is "<<i<<endl; cout<<"Final amount is "<<fa; //get character getch(); }

**Output**

Enter the amount

100

Interest @ 9% for 1yr. is 9

Final amount is 109

**Program to calculate simple interest for 2 years.**

#include<iostream.h> #include<conio.h> void main() { //clear the screen. clrscr(); //declare variable type float float a,i,fa; //Input amount the save it in 'a' cout<<"Enter the amount"<<endl; cin>>a; //calculate interest and final amount and save them in 'i' and 'fa' i=a*9*2/100; fa=a+i; //show the output cout<<"Interest @ 9% for 2yr. is "<<i<<endl; cout<<"Final amount is "<<fa; //get character getch(); }

**Output**

Enter the amount

100

Interest @ 9% for 2yr. is 18

Final amount is 118

**Program to calculate simple interest for 3 year.**

#include<iostream.h> #include<conio.h> void main() { //clear the screen. clrscr(); //declare variable type float float a,i,fa; //Input amount the save it in 'a' cout<<"Enter the amount"<<endl; cin>>a; //calculate interest and final amount and save them in 'i' and 'fa' i=a*9*3/100; fa=a+i; //show the output cout<<"Interest @ 9% for 3yr. is "<<i<<endl; cout<<"Final amount is "<<fa; //get character getch(); }

**Output**

Enter the amount

100

Interest @ 9% for 3yr. is 27

Final amount is 127

**Program to calculate simple interest for given year.**

#include<iostream.h> #include<conio.h> void main() { //clear the screen. clrscr(); //declare variable type float float a,y,i,fa; //Input amount and year and save them in 'a' and 'y' cout<<"Enter the amount"<<endl; cin>>a; cout<<"Enter the years"<<endl; cin>>y; //calculate interest and final amount and save them in 'i' and 'fa' i=a*9*y/100; fa=a+i; //show the output cout<<"Interest @ 9% is "<<i<<endl; cout<<"Final amount is "<<fa; //get character getch(); }

**Output**

Enter the amount

100

Enter the years

5

Interest @ 9% for is 45

Final amount is 145

**Program to calculate simple interest for given year and given rate**

#include<iostream.h> #include<conio.h> void main() { //clear the screen. clrscr(); //declare variable type float float a,y,r,i,fa; //Input amount and year and save them in 'a' and 'y' cout<<"Enter the amount"<<endl; cin>>a; cout<<"Enter the years"<<endl; cin>>y; cout<<"Enter the rate"<<endl; cin>>r; //calculate interest and final amount and save them in 'i' and 'fa' i=a*r*y/100; fa=a+i; //show the output cout<<"Interest is "<<i<<endl; cout<<"Final amount is "<<fa; //get character getch(); }

**Output**

Enter the amount

100

Enter the years

5

Enter the rate

6

Interest is 30

Final amount is 130

**How does it work**

- You enter the necessary inputs for calculation in and is saved in variables.
- The Interest and final amount is calculated according to formula and is saved in respt. variables.
- Variables are shown by cout.

**Extending it**

The program can be extended by using different years and rates. You can take the necessary inputs and calculate the simple interest.

**Explanation.**

- Include ‘iostream.h’ and ‘conio.h’ files.
- Add void main.
- Start program by first clearing the screen.
- Declare the variables as float (name the as you want.)
- Add cout and cin of variables of necessary inputs.(as shown in program)
- Calculate the interest of the variables and save them in respt. variable.
- Cout the variables.

**At the end**

You learnt creating the c++ program of Calculation of Simple interest. So now enjoy the program.

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