I'm very new to programming and i'm trying to create a delay, but I keep getting the error "expression preceding parentheses of apparent call must have (pointer-to-) function type"
on the line that has delay(1000); is where i get the error. why is this happening and how can i fix it?Code:void AI(void){ unsigned int delay = 1000; if (yR2 > yBall) { if (yR2 > RACKET ) { delay(1000); yR2--; } }
There is no delay() function under Linux, but there is a sleep() function.
If you are on another O/S, then there may or may not be a delay() function. If so, then you need to check the compiler's Standard Library documentation for the correct header file to use.
there is a delay function, i've used it before. also, i'm programming a microcontroller.
what else could be the problem, have i written the code incorrectly?
Please show the error message(s) you are receiving.
Which compiler?
i have no idea what compiler it is, this is like homework, so all i have been instructed to do is answer questions using code composer studio. sorry to sound nooby, but i literally started programming 2 days ago
Is yR2 a global variable? Is it defined outside of any function?Originally Posted by nothing909
Again: Please copy and paste the error message(s) you are receiving into your response, so I can better answer your questions!!!
Your specific error message relates to the fact you also have a variable called delay as well.
If you really have a delay () function, you need to rename your variable.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Guess I am blind! ;^)
Thanks!
The error message is "expression preceding parentheses of apparent call must have (pointer-to-) function type"
I don't have a delay function, I only have that delay variable. Do I need a delay function?
And yR2 is a global variable.
I guess you could write your own.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
do i need to write a delay function for the delay to work?
if so, how do i go about writing it? can you give me an example
Inline
As a functionCode:int n = 1000; volatile int i; for ( i = 0 ; i < n ; i++ ) ; // do nothing
Code:void delay ( int n ) { volatile int i; for ( i = 0 ; i < n ; i++ ) ; // do nothing }
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
if they both got to be true before delay takes place.
Code:if (yR2 > yBall && yR2 > RACKET ) { delay(1000); yR2--; }
i don't understand what you mean, can you relate it to my code?
do i need to have a function. if so, why. i tried creating a function and it still doesn't resolve the issue.
that is just a blank loop that just loops for an x amount of time to make a delay occur, give it a try, the larger the number the longer the delay. the need to make his or her code into a function is up to the programmer.
Last edited by userxbw; 12-10-2017 at 02:34 PM.
