Example: Hollow Diamond Pattern in C++ using For loop

// Hollow Diamond Pattern in C++ using For loop
#include <iostream>
using namespace std;

int hollowDiamond(int x);
int main() {
    int x;
    // x - denotes the size of the hollow diamond

    cout << "-----Enter the size of the hollow diamond, it should be even-----\n";
    cin >> x;

    // Size of the hollow diamond should be even number
    if (x % 2 == 1)
        x++;

    // This will print the hollow diamond pattern
    hollowDiamond(x);
    return 0;
}

int hollowDiamond(int size) {
    int i, j, diff;
    diff = size / 2;

    cout << "\n-----The hollow diamond pattern is-----\n\n";

    // This will print the first half diamond
    for (i = 1; i <= diff; i++) {
        cout << "\t";
        for (j = 1; j <= diff - i; j++) {
            cout << " ";
        }
        if (i == 1) {
            cout << "*";
        } else {
            cout << "*";
            for (j = 1; j <= 2 *i - 3; j++) {
                cout << " ";
            }
            cout << "*";
        }
        cout << "\n";
    }

    // This will print the last half diamond
    for (i = diff + 1; i < size; i++) {
        cout << "\t";
        for (j = 1; j <= i - diff; j++) {
            cout << " ";
        }
        if (i == size - 1) {
            cout << "*";
        } else {
            cout << "*";
            for (j = 1; j <= 2 *(size - i) - 3; j++) {
                cout << " ";
            }
            cout << "*";
        }
        cout << "\n";
    }
}