where to use the if statements??

Question

actually i didn't get where to use the if statements

Answer 1

Use "if statement" when you have some decision to make on the basis of conditions.

Example: 4 is even or odd??

if(4%2==0)
cout<<"even";
else
cout<<"not even";

Answer 2

if statements are used if you want a line of code to be ran under specific conditions. For example if you were on a website, and you wanted to print something else if the user was 18 or older you would write
if (age >= 18){
cout << "You are allowed to enter" << endl;
else{
cout << "You are not old enough" << endl;

So it only runs if that condition is true, otherwise it runs the default code else statement. Which would be anything under 18