C++ Program to find the Sum, Average, Minimum & Maximum of array with return type UDF

#include<iostream>
#include<time.h>
#include<stdlib.h>

using namespace std;

int sumArray(int[],int);
int avgArray(int[],int);
int minArray(int[],int);
int maxArray(int[],int);

int main()
{
int a[100],n,i,sum, min, max, avg;
cout<<"Enter Size of Array (Max. 100): ";
cin>>n;

//Random Input
srand((unsigned)time(NULL));
cout<<"\nThe values of array are:\n";
for(i=0;i<n;i++)
{
a[i]=(rand()%90)+10;
cout<<"Value-"<<i+1<<" : "<<a[i]<<endl;
}

sum=sumArray(a,n);
cout<<"Sum     : "<<sum<<endl;

avg=avgArray(a,n);
cout<<"Average : "<<avg<<endl;

min=minArray(a,n);
cout<<"Minimum : "<<min<<endl;

max=maxArray(a,n);
cout<<"Maximum : "<<max<<endl;
}

int sumArray(int ar[],int n)
{
int s=0, i;
for(i=0;i<n;i++)
s=s+ar[i];
return s;
}

int avgArray(int ar[],int n)
{
int s=0, i;
for(i=0;i<n;i++)
s=s+ar[i];
return (s/n);
}

int minArray(int ar[],int n)
{
int m, i;
m=ar[0];
for(i=0;i<n;i++)
if(ar[i]<m)
m=ar[i];
return m;
}

int maxArray(int ar[],int n)
{
int m, i;
m=ar[0];
for(i=0;i<n;i++)
if(ar[i]>m)
m=ar[i];
return m;
}