October 23, 2023
/ 375 /# C Program to Calculate the Average of N Numbers

## Table of Contents

**The C Program to Calculate the Average of N Numbers:**

**Explanation of the code step by step:**

**Wrap Up**

In this article, we are going to look at a C program that can be used to calculate the average of “N” numbers.

We will be using an array to store the numbers.

```
#include <stdio.h>
int main() {
int n;
printf("Enter number of elements: ");
scanf("%d", &n);
int avgArr[n];
printf("Enter each number:\n");
for (int i = 0; i < n; i++) {
scanf("%d", &avgArr[i]);
}
int sum = 0;
for (int i = 0; i < n; i++) {
sum += avgArr[i];
}
double result = (double)sum / n;
printf("Resultant is: %.2lf", result);
return 0;
}
```

`#include <stdio.h>`

: This line includes the standard input-output library, which is necessary for using functions like`printf`

and`scanf`

.`int main() {`

: This is the main function of the program, where the execution begins.`int n;`

: Declares an integer variable ’n’ to store the number of elements for which you want to calculate the average.`printf("Enter number of elements: ");`

: This line displays a message on the screen, prompting the user to enter the number of elements.`scanf("%d", &n);`

: This line reads an integer from the user’s input and stores it in the variable ’n'.`int avgArr[n];`

: This declares an integer array ‘avgArr’ with a size of ’n’. This array will be used to store the ’n’ numbers for which you want to calculate the average.`printf("Enter each number: \n");`

: This line displays a message, prompting the user to enter each of the ’n’ numbers.`for(int i = 0; i < n; i++) {`

: This is a loop that iterates ’n’ times. It starts with ‘i’ equal to 0 and goes up to ’n-1’.`scanf("%d", &avgArr[i]);`

: Inside the loop, this line reads an integer from the user’s input and stores it in the ‘i’-th position of the ‘avgArr’ array.

i.e., It takes an integer input from the user and puts it into the ‘avgArr’ array at the position specified by ‘i’, which be at**0, 1 …**depending on ’n’ and the iterarion it is at.`int sum = 0;`

: This line initializes an integer variable ‘sum’ to 0. ‘sum’ will be used to calculate the sum of all the ’n’ numbers.`for(int i = 0; i < n; i++) {`

: Another loop is used to iterate through the ‘avgArr’ array.`sum += avgArr[i];`

: Inside the loop, it adds the ‘i’-th element of ‘avgArr’ to the ‘sum’ variable, effectively accumulating the sum of all the numbers.`double result = (double)sum / n;`

: After calculating the sum, it computes the average by dividing the ‘sum’ by ’n’.

The`(double)`

typecast is used to ensure that the division is done in floating-point arithmetic to preserve the decimal portion.`printf("Resultant is: %.2lf", result);`

: This line prints the average (stored in the ‘result’ variable) to two decimal places using the format specifier`%.2lf`

.`return 0;`

: Finally, the program returns 0 to indicate successful execution of the program and terminates.

The program prompts the user for the number of elements, reads those elements, calculates their sum, and then divides the sum by ’n’ to find the average, which is displayed to the user.

For example, if the user what to find the average of 4 numbers (1, 2, 3, 4). The output will be:

```
2.50 // Output is (1 + 2 + 3 + 4) / 4
```