See the Tutorial List

C Program to calculate Simple Interest

Below is a program to calculate the Simple Interest for a given prinicipal amount, rate of interest and time duration.

%7.3f means the float value will be represented in 7 digits including 3 digits after decimal places.

#include<stdio.h>

void main()
{
    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
    float principal_amt, rate, simple_interest;
    int time;
    printf("Enter the value of principal amount, rate and time\n\n\n");
    scanf("%f%f%d", &principal_amt, &rate, &time);

    // considering rate is in percentage
    simple_interest = (principal_amt*rate*time)/100.0;

    // usually used to align text in form of columns in table
    printf("\n\n\t\t\tAmount = Rs.%7.3f\n ", principal_amt);

    printf("\n\n\t\t\tRate = Rs.%7.3f\n ", rate);
    printf("\n\n\t\t\tTime= %d years \n", time);
    printf("\n\n\t\t\tSimple Interest = Rs.%7.3f\n ", simple_interest);
    printf("\n\n\t\t\tCoding is Fun !\n\n\n");
    return 0;
}

Output:

C program output for Simple Interest