Question

How to find the average of int array in C

Answer 1

#include <stdio.h>

int sum_array(int arr[], int len);

int main(void)
{
    int arr[] = {1, 2, 3, 4, 5, 6, 81}, size;
       
    size = sizeof(arr) / sizeof(int); 
    
    printf("average = %f", (float) sum_array(arr, size) / size); // 14.571429
    
    return 0;
}
int sum_array(int arr[], int len)
{
    int i, sum = 0;
    
    for (i = 0; i < len; i++) sum += arr[i];
    
    return sum;
}

/* 
run:

average = 14.571429

*/

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Answer 2

#include <stdio.h>
 
int sum_array(int arr[], int len);
 
int main(void)
{
    int arr[] = {1, 2, 3, 4, 5, 6, 81}, arr_size;
    float sum = 0;
    
    arr_size = sizeof(arr) / sizeof(int); 
	sum = sum_array(arr, arr_size);
     
    printf("average = %.2f", sum / arr_size); 
     
    return 0;
}
int sum_array(int arr[], int len)
{
    int i, sum = 0;
     
    for (i = 0; i < len; i++) sum += arr[i];
     
    return sum;
}
 
/* 
run:
 
average = 14.57
 
*/

 

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