Bool Confusion

zatora · #1 09-Dec-2008, 18:34

i have this function to determine the operand precedence

CPP / C++ / C Code:

bool op_precedence(char a, char b)
{
return(a=='*'||a=='/')>=(b=='*'||b=='/');
}

can nayone tell me how the compiler will evaluate this expression when
1 - a=='+' and b=='*'
2- a=='*' and b=='/'

thanks all.

WaltP · #2 09-Dec-2008, 21:35

Quote:

Originally Posted by zatora

i have this function to determine the operand precedence

CPP / C++ / C Code:

bool op_precedence(char a, char b)
{
return(a=='*'||a=='/')>=(b=='*'||b=='/');
}

can nayone tell me how the compiler will evaluate this expression when
1 - a=='+' and b=='*'
2- a=='*' and b=='/'

thanks all.

Code:

a = '-'
b = '/'  
(yes I know this was not one of your questions, but I won't give you the answer.  With this info, you can figure out the answers for your yourself)

return(a=='*'||a=='/')>=(b=='*'||b=='/');
       \____/  \____/    \____/  \____/
          F       F         F       T
          \_______/         \_______/   
              F                 T
              \_________________/
                       ?

What do you expect to happen when comparing two binary values with >=?

zatora · #3 09-Dec-2008, 22:22

well that looks not well formed and i have this function that i found online to determine the priority order between(*,+,/,-) and why the author put the code like that i have no idea , any better algorithm to compare the precedence order between those four operands. thanks all

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Bool Confusion

Re: Bool Confusion

Re: Bool Confusion