C++ Program:

Example:

#include <iostream>
using namespace std;

int main() {
  int arr[]={10,12,5,7,1,9,3,2,9,3};
  int small;

  int l= sizeof(arr)/sizeof(arr[0]);
  small=arr[0];
  for(int i=1; i<l; i++){
    if(small>arr[i])
      small=arr[i];
  }
  cout<<"The smallest number in array is : ";
  cout<<small;
  return 0;
}

Output:

  The smallest number in array is : 1

We are pre-defining the array in here, you can customize your array

Main Logic :

//To find size of an array
int l= sizeof(arr)/sizeof(arr[0]);

//take 1st element of an array as small(ASSUME) 
  small=arr[0];

//finding the smallest
  for(int i=1; i<l; i++){
    if(small>arr[i])
      small=arr[i];
  }
//Finally print the 'small' value

To find the largest one, just change if(small>arr[i]) to if(small<arr[i])