ROBOTC programming error warning

noobwyatt2 · Sun Oct 30, 2011 7:22 pm

I'm writing a program for my last school assignment that is essentially a simple plotter (only doing letters at the moment), however when trying to compile the program i get the error:

"**Error**:Mixed mode (byte/short) comparison in conditional branch".

the thing is the section of the code it is reffering to is comparing a char to a byte, as far as i thought a char was considered to be a number so i'm not sure as to why this error is occuring. although i've only been coding in ROBOTC for the past week (i haven't used version of c previously either).

here is the code, the problem line is "if letters[i][0] == l"


	Code: void DrawLetter(char l){ nMotorEncoder[motorA] = 0; nMotorEncoder[motorB] = 0; nMotorEncoder[motorC] = 0; bool finished = false; for (int i=0; i < sizeof(letters)/sizeof(letters[0][0])/6 ; i++){ //calculate the number of rows in array and cycles through them if (letters[i][0] == l){ nMotorEncoderTarget[letters[i][1]] = letters[i][2]; motor[letters[i][1]] = letters[i][3]; motor[letters[i][4]] = letters[i][5]; while(nMotorRunState[letters[i][1]] != runStateIdle); //does until nMotorRunState = runStateIdle motor[letters[i][1]] = 0; motor[letters[i][4]] = 0; finished = true; //returns if the letter has been reached or not } else if (finished) return; //exits loop if letter is completed }// for }//drawLetter

any ideas as to why this is happening or how i can get around it?

here is an example of the array:


	Code: const int letters[][] = { {'A',1,485,-75,0,0}, // the last two are a second set of target motors and associated power levels as to make diagonal lines {'A',2,180,75,0,0}, {'A',1,485,75,0,0} };

let me know if you need any more details and any help would be greatly appreciated.

ROBOTC programming error warning

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