A simple program to understand printf() and scanf() function

Now we will see how printf() and scanf() function works together to perform a particular work.
We will write a program to calculate the Simple Interest. where the principle, rate of interest and the time in years will be taken from the user.

#include<stdio.h>
#include<conio.h>
void main()

{
float si, p, r;     /* declaration of float type variables */
int t;                /* declaration of integer type variables */
clrscr();            /*  used to clear screen */
printf(“Enter the principle amount = Rs ”);           /* Printing of user friendly statement */
scanf(“%f”, &p);                                                     /* Inputting the value of float type variable p from the user */
printf(“\nEnter the rate of interest = ”);              /* Printing of user friendly statement */
scanf(“%f”, &r);                                                     /* Inputting the value of float type variable r from the user */
printf(“\nEnter the time in years = ”);                  /* Printing of user friendly statement */
scanf(“%d”, &t);                                                    /* Inputting the value of integer type variable t from the user */
si=(p*t*r)/100;                                                        /* logical operation for calculating the simple interst */
printf(“Therefore the Simple Interest = Rs %.2f”, si);     /* Printing the output with the user-friendly statement */
getch();                                                                            /* pause the output screen */
}

The output of this program is as follows:
Enter the principle amount = Rs 250
Enter the rate of interest = 8.5
Enter the time in years = 5
Therefore the Simple Interest = Rs 106.25