How do the if else condition works

Answer 1

if (condition) {
stuff to do if condition is true
} else {
stuff to do if condition is false
}

Example:
bool isEven(int n) {
if (n % 2 == 0) {
return true;
} else {
return false;
}
}

Answer 2

http://www.tutorialspoint.com/cplusplus/cpp_if_else_statement.htm

Answer 3

https://www.python.org/downloads/