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Postby JohnRobert » Sun Feb 03, 2013 9:17 am


I have the following code...

Code: Select all

void writeStr(char message[]){
	for(int x = 0; x<sizeof(message)-1; x++){
		txByte(TXD, (int)message[x]);
The IDE is telling me: "invalid application of `sizeof'"

Why is this, and how to fix it?


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Postby pstnotpd » Sun Feb 03, 2013 9:54 am

In ANSI C an array is passed as a pointer to the first element, i.e. by reference

I think the issue is you're trying to pass an un-sized array so the sizeof function cannot be aware of the size.

Examples usually pass the actual size of the array along with the array itself.


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void writeStr(char message[],int arr_size) {
I've also found examples where you specify the size in the parameter, but as you appear to want flexibility in size this would not be an option.

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