how to make a loop in c 2b 2b

1//'i' can be any number
2//Can be any comparison operater 
3//can be any number compared
4//can be any mathmatic operater
5
6for (int i = 0; i<100; i++){
7//Do thing
8}
9
10//more info on operaters
11//https://www.w3schools.com/cpp/cpp_operators.asp

1for (int i; i < 10; i++)
2{
3  cout << i << "\n";
4}