else if

if (condition1) {
  // code to execute if condition1 is true
} else if (condition2) {
  // code to execute if condition1 is false and condition2 is true
} else if (condition3) {
  // code to execute if condition1 and condition2 are false and condition3 is true
} ...
else {
  // code to execute if none of the conditions are true
}

#include <iostream>

using namespace std;

int main()
{
    int mark = 0;
    cin >> mark;
    if (mark >= 90)
        cout << "A" << endl;
    else if (mark >= 80)
        cout << "B" << endl;
    else if (mark >= 70)
        cout << "C" << endl;
    else if (mark >= 60)
        cout << "D" << endl;
    else
        cout << "F" << endl;

    return 0;
}

#include <iostream>

using namespace std;

int main()
{
    int x = 0, y = 0;
    cout << "Enter 2 numbers" << endl;
    cin >> x >> y;
    if (x < y)
        cout << "y is greater than x" << endl;
    else if (x > y)
        cout << "x is greater than y" << endl;

    else
        cout << "Both are equal" << endl;
    
    cout << "C++ is great language!" << endl;



    return 0;
}