C programming

Please find error in the program

@ajaychowdhury
C++ program#include <iostream>
using namespace std;
int main()
{
int n, i;
float num[100], sum=0.0, average;
cout << "Enter the numbers of data: ";
cin >> n;
while (n > 100  n <= 0)
{
cout << "Error! number should in range of (1 to 100)." << endl;
cout << "Enter the number again: ";
cin >> n;
}
for(i = 0; i < n; ++i)
{
cout << i + 1 << ". Enter number: ";
cin >> num[i];
sum += num[i];
}
average = sum / n;
cout << "Average = " << average;
return 0;
}C program for two number average
/* c program find sum and average of two numbers*/
#include <stdio.h>int main()
{
int a,b,sum;
float avg;printf("Enter first number :"); scanf("%d",&a); printf("Enter second number :"); scanf("%d",&b); sum=a+b; avg= (float)(a+b)/2; printf("\nSum of %d and %d is = %d",a,b,sum); printf("\nAverage of %d and %d is = %f",a,b,avg); return 0;
}
Still any doubt , let me know