passing array as arguments specx range of array at main func?is the foll snippet wrong

Question

float avg(a,size)
float a[];
int size;
{
int i;
float sum=0;
for(i=0;i<size;i++)
sum+=a[i];
return(sum/size);
}
//main func
#define NUM 25
float a[NUM];
avg(a,NUM);

Answer 1

your first line should be float avg(float a[],int size) and then you dont need second and third line.

Answer 2

A minor modification is all that is needed here:

#include <iostream>

#define NUM 25

float avg(float a[], int size)
{
float sum = 0;

for(int i = 0; i < size; i++)
sum += a[i];
return(sum / size);
}

// main func
int main()
{
float a[NUM];

// Get value for each array element
// 25 inputs needed (as defined by NUM)
for(int i = 0; i < NUM; i++)
std::cin >> a[i];
// Calculate & display avg
std::cout << " AVG: " << avg(a, NUM);
}