Question

Example code:

int hour = 0;
bool saveData = true;

if(hour > 0) doSomeMethod(); saveData = false;

In the code above, saveData will always be set to false, yet doSomeMethod() won’t be fired. I figured that the compiler treats the semi-colon after doSomeMethod() as an indicator to move to the next statement, ignoring that it’s on the same line as the if statement. What’s the reason for this behaviour?

Answer 1

An if statement can contain either a single statement, or a code block. Once the compiler finds the ; it ends the if.

Your code above is equivalent to:

if (hour > 0)
    doSomeMethod();
saveData = false;

What you want is:

if (hour > 0)
{
    doSomeMethod();
    saveData = false;
}

or:

if (hour > 0) { doSomeMethod(); saveData = false; }