How to Implement a Grade Calculator in C using While Loops and Functions

As a student learning programming, one of the fundamental tasks is to write a simple program that can help you manage and process data. In this article, we will cover how to write a program in C that can take 10 grades as input and calculate their average using both a function and a while loop. This example not only showcases the basic syntax of C but also demonstrates the use of functions, loops, and user input.

Understanding the Task

Our goal is to create a program that takes 10 grades as input from the user, calculates their average, and then displays the result. This process involves several steps, including:

Defining a function to calculate the average of the grades. Using a while loop to gather 10 grades from the user. Storing the grades in an array. Calculating the average of the grades. Displaying the result to the user.

Step-by-Step Guide

1. Define the Function to Calculate the Average

First, we need to define a function that takes an array of grades and the number of grades as input parameters. This function will calculate and return the average of the grades.

float calcularPromedio(float valores[], int cantidad) {    int i;    float suma  0.0;    for (i  0; i  cantidad; i  ) {        suma   valores[i];    }    return suma / cantidad;}

This function, calcularPromedio, iterates through the array of grades using a for loop, sums up all the values, and then returns the average by dividing the sum by the total number of grades.

2. Implement the Main Function

Next, we need to implement the main function, where we will ask the user to input the grades and then call our calcularPromedio function to get the average. We will use a while loop to ensure that we gather exactly 10 grades.

#include stdio.hfloat calcularPromedio(float valores[], int cantidad) {    int i;    float suma  0.0;    for (i  0; i  cantidad; i  ) {        suma   valores[i];    }    return suma / cantidad;}int main() {    int notas[10];    int n  0; // Number of grades entered    char opcion[3]  "n"; // Prompt user to enter another grade    do {        printf("Enter grade %d: ", n   1);        scanf("%d", notas[n]);        n  ;        printf("Do you want to enter another grade? (y/n): ");        scanf("%2s", opcion);    } while (opcion[0]  'y' || opcion[0]  'Y'  n  10);    float promedio  calcularPromedio(notas, n);    printf("The average of the grades is: %.2f
", promedio);    return 0;}

In our main function, we initialize an array notas to store the grades. We also initialize a variable n to keep track of the number of grades entered and a character array opcion to prompt the user to enter more grades.

The do-while loop continues until 10 grades are entered or the user decides not to enter more grades. Each time a grade is entered, we increment n. The loop also checks if the user wants to enter more grades using the opcion condition.

Once the loop is exited, we call the calcularPromedio function with the notas array and the current count of grades. The average is then displayed to the user.

Conclusion

Writing a C program to calculate the average of 10 grades is a great way to practice your programming skills and understand the basics of functions, loops, and input/output operations in C. By following the steps outlined here, you should be able to create a functional and efficient grade calculator in C. If you have any questions or need further clarification, feel free to leave a comment below!

Related Keywords

C Programming Grade Calculation While Loops

Note: This example assumes that you are familiar with basic C programming concepts such as arrays, functions, and user input. If you are new to C or programming in general, consider reviewing these basics before attempting to understand this example.