Functions with return statments inside of structs

Fido488 · Thu Dec 20, 2012 3:53 pm

In an attempt to avoid the very annoying "inline" error and with the goal to make cleaner code I have written a PID control loop that you can create multiple instances of (hopefully).
This part of the code successfully compiles:


	Code: typedef struct{ float KP; float KI; float KD; float previousError; int integral; } PidValue; typedef struct{ int value(int value, int targetValue, PidValue k){ int error = targetValue - value; k.integral += error; if(error == 0){ k.integral = 0; } if(abs(error)> 40){ k.integral = 0; } int derivative = error - k.previousError; k.previousError = error; return ((k.KPerror)+(k.KIk.integral)+(k.KD*derivative)); }; } PID; PidValue testV ={0, 0, 0, 0, 0}; PID test;

This, however, fails to compile and gives errors on the indicated lines:


	Code: int returned; task main() { // Hooray for test cases! while (1){ for(int j = 0; j<100; j++){ returned = test.value(j, 50, testV); // See error below } for(int j = 100; j>0; j--){ returned = test.value(j, 50, testV); // Same error given } } }

Here is the error that is given:


	Code: File "PID.c" compiled on Dec 20 2012 14:51:56 Error:'value' is not a 'struct' element of struct reference 'test' Error:Unexpected token ',' Error:Expected->';'. Found ',' Error:Unexpected ',' during parsing Error:Unexpected '50' during parsing Error:Missing ';' before ')' Error:Unexpected ')' during parsing Warning:Meaningless statement -- no code generated

I'm getting the impression that I'm doing something illegal in Robot C however I'm confused why the struct will compile but when I actually try to test it it wont.
Thanks!
Fido488

Functions with return statments inside of structs

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