C Program to Calculate Average using Array

In this c program, you will learn how to calculate average of numbers (entered by the user) using array in c.

#include<stdio.h>

int main()
{
    int n, i;
    float num[100], sum =0.0, average;
    
    printf("Enter the numbers of elements : ");    
    scanf("%d",&n);
    while(n >100|| n <=0)
    {        
        printf("Error! number should in the range of (1 to 100).\n");        
        printf("Enter the number again : ");        
        scanf("%d",&n);
    }
        for(i =0; i < n;++i)
        {        
            printf("%d. Enter number : ", i+1);        
            scanf("%f",&num[i]);        
            sum += num[i];
        }    
    average = sum / n;    
    printf("Average of the numbers is = %.2f", average);
    return 0;
}

#include<stdio.h>

int main()

{

int n, i;

float num[100], sum =0.0, average;

printf("Enter the numbers of elements : ");

scanf("%d",&n);

while(n >100|| n <=0)

{

printf("Error! number should in the range of (1 to 100).\n");

printf("Enter the number again : ");

scanf("%d",&n);

}

for(i =0; i < n;++i)

{

printf("%d. Enter number : ", i+1);

scanf("%f",&num[i]);

sum += num[i];

}

average = sum / n;

printf("Average of the numbers is = %.2f", average);

return 0;

}

When you run above program, the output will be following:

Enter the numbers of elements : 4                                                                                           
1. Enter number : 2                                                                                                         
2. Enter number : 8                                                                                                         
3. Enter number : 9                                                                                                         
4. Enter number : 4                                                                                                         
Average of the numbers is = 5.75

Enter the numbers of elements : 4

1. Enter number : 2

2. Enter number : 8

3. Enter number : 9

4. Enter number : 4

Average of the numbers is = 5.75