I haven't done any programming for a while and I cannot understand this..... I get the compile error expected primary-expression before '/' token at the line with HERE in the comment in this srtn, yet the similar commands above it are OK. void getDigits() { float result = hh/10; //=2.1 …

[image] Nick_Pyner: %/ Either % or / :wink: And you have a stack of re-declarations of variables.

assuming everything is a global variable, you could do void getDigits() { digit0 = hh / 10; digit1 = hh % 10; digit2 = mm / 10; digit3 = mm % 10; digit4 = ss / 10; digit5 = ss % 10; }

Thank you, both. That section is now fine. What I couldn't understand is why only the last command was in error. I can only assume that, for this part of the programme, the verifier starts at the bottom and works up - which explains what happened when I commented stuff out.

The compiler starts from the top. It reports the point where it finds something it cannot handle. It can be rather cryptic. But the error is always at or before the given point. Especially missing {} and ; will give cryptic messages. Almost never: hey, I suspect a missing } here.

Note you can check if you have a missing number of opening braces or closing braces, by clicking your cursor on the opening brace and the matching closing brace (if any) will be outlined. It will help you track down problems like this. Also it helps if you post all your code, because it is very li…

[image] build_1971: The compiler starts from the top. [image] Grumpy_Mike: No it is the other way round, it starts at the top and works down. OK, but this does not explain why the compiler passed over two identical bad commands and only declared an error on the third. Also, when I comm…

[image] Nick_Pyner: OK, but this does not explain why the compiler passed over two identical bad commands and only declared an error on the third. I compiled the below based on your example; ignore the fact that the variables are not initialised. void setup() { // put your setup code here,…

But the red line was on the third instance (line HERE) and if I uncomment the last lines, the red line is on "and HERE" i.e. later The only way I can get the red line on the first instance is by commenting out everything after it. Perhaps I need a new IDE. This is 1.8.3, but I have never had cause…

Ignore the red line, look at the line numbers in the output. IDE 2.3.6 seems better from that perspective [image] But I would not consider that a reason to upgrade.

[image] Nick_Pyner: OK, but this does not explain why the compiler passed over two identical bad commands and only declared an error on the third. The compiler only complains when it reaches something that it can't understand. It just shows you that the previous statements could be resolved i…

Expected primary-expression before '/' token

Projects Programming

sterretje June 29, 2025, 11:26am 14

You can disable that if you want; see Arduino IDE 2.3.6 is now available - #16 by ptillisch.

Topic		Replies	Views
Math problem with variable names Programming	16	326	March 23, 2025
Benötige Hilfe bei der Fehlermeldung "Compilation error: expected primary-expression before ')' token" Deutsch	15	964	October 31, 2024
Equation issues with mixed variable types Programming	12	295	July 27, 2025
Expected primary-expression before "." token Español	10	2775	August 21, 2022
Trying to fix expected primary-expression before ')' token Programming	7	1948	October 4, 2021

Expected primary-expression before '/' token

Related topics