Simple Interest: C Program

Video Tutorial illustrating: C Program To Calculation of Simple Interest.

Header File:

   #include<stdio.h>

To be able to use printf function, we have to include stdio.h header file.

main()
This is the starting point of C program execution.
since it does not return any value, we write void main()

Declaration of Variables:

   int p, n;
float r, si;

variables p and n are integer type variables i.e., they can hold integer values.
variables r and si are float or real type variables i.e., they can hold fractional values.

   clrscr();

to clear the output screen.

Initialization of Variables:

   p = 1000;
n = 3;
r = 8.5;

Principle p = 1000
n or time or duration = 3
rate of interest r = 8.5

Formula to calculate simple interest:

     si = ( p * n * r ) / 100;

The mathematical formula si = ( p x n x r ) / 100; is written as si = ( p * n * r ) / 100;

Output statement:

printf("%f\n",si);

the function printf is present inside stdio.h header file. %f is formatting string for float or real type values.

getch();

function to return to the console window.

Video Tutorial: C Program to calculate Simple Interest

Full Source code to calculate simple interest in C program:

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#include<stdio.h>
 
void main()
{
 
int p, n;
float r, si;
 
clrscr();
 
p = 1000;
n = 3;
r = 8.5;
 
si = ( p * n * r ) / 100;
 
printf("%f\n",si);
 
getch();
}

Output:
255.000000