how to use if statement in c++ code example

Example 1: elseif c++

if( a == 10 ) {
      cout << "Value of a is 10" << endl;
   } else if( a == 20 ) {
      // if else if condition is true
      cout << "Value of a is 20" << endl;
   }

Example 2: C++ if else

#include<iostream>
using namespace std;

int main()
{
    int grade;

    cin >> grade;

    if( grade >= 60 )
    {
        cout << "You Pass!" << endl;
    }
    else
    {
        cout << "You Fail..." << endl;
    }

    return 0;
}

Example 3: c++ how to do else if statements

if (variable) {
  variable is true 
  }