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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. char *strtolower(char *str) {
  5.   char *ptr = str;
  6.  
  7.   while(*ptr != '\0') {
  8.     *ptr = tolower(*ptr);
  9.     ++ptr;
  10.   }    
  11.  
  12.   return str;
  13. }
  14.  
  15. int main(void) {
  16.   char str[] = "stEfAn";
  17.  
  18.   printf("%s", strtolower(str));
  19.  
  20.   return 0;
  21. }
Success #stdin #stdout 0.01s 1720KB
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Standard input is empty
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stefan
https://ideone.com/PO39Oy
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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