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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. void strupr(char *str) {
  5.     while (*str) {
  6.         *str++ = toupper(*str);
  7. //        str++;
  8.     }
  9. }
  10.  
  11. int main(void) {
  12. 	char texto[] = "teste";
  13. 	strupr(texto);
  14. 	printf("%s", texto);
  15. 	return 0;
  16. }
  17.  
Compilation error #stdin compilation error #stdout 0s 2112KB
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stdin
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Standard input is empty
compilation info 
prog.c: In function 'strupr':
prog.c:6:13: error: operation on 'str' may be undefined [-Werror=sequence-point]
         *str++ = toupper(*str);
             ^
cc1: all warnings being treated as errors
stdout
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Standard output is empty
https://ideone.com/bOePYL
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

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