Hello :slight_smile: I have a small question about general c++ programming: char* test1( unsigned long a ) { char s[13]; //under 13 = arduino reset sprintf(s,"<%lu>", a); return s; } char* test2( unsigned long a ) { char s[39]; //under 39 = weird output sprintf(s,"<%lu>", a); return s…

Theory of why this doesn't really work?

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