Is there a shorter way to write compound 'if' conditions? [duplicate]

Answer 1

For this specific case you can use the fact that char is an integer and test for a range:

if(ch >= 'A' && ch <= 'C')
{
    ...
}

But in general this is not possible unfortunately. If you want to compress your code just use a boolean function

if(compare_char(ch))
{
    ...
}