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The following non-compliant code example simply illustrates calling the standard string handling function strlen() with a plain character string, a signed character string, and an unsigned character string:
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#include <string.h> int main(void) { size_t len; char cstr[] = "char string"; signed char scstr[] = "signed char string"; unsigned char ucstr[] = "unsigned char string"; len = strlen(cstr); len = strlen(scstr); /* warns when char is unsigned */ len = strlen(ucstr); /* warns when char is signed */ return 0; } |
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Compiling at high warning levels in compliance with [MSC00-A. Compile cleanly at high warning levels] causes warnings to be issued when converting from {{unsigned char\[\]}} to {{const char *}} when {{char}} is signed and from {{signed char\[\]}} to {{const char *}} when char is defined to be unsigned. Casts are required to eliminate these warnings, but excessive casts can make code difficult to read and hide legitimate warning messages. |
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The compliant solution uses plain char for character data.
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#include <string.h> int main(void) { size_t len; char cstr[] = "char string"; len = strlen(cstr); return 0; } |
Conversions are not required and the code compiles cleanly at high warning levels without casts.
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