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  1. /* 
  2.  * hello.c
  3.  * 
  4.  * print "Hello World!" on standard output device (console).
  5.  * 
  6.  */
  7.  
  8. #include <stdio.h>
  9.  
  10. void toUpperCase(char *p);
  11. void toLowerCase(char *p);
  12.  
  13. int main()
  14. {
  15.     char mes1[] = "Hello";
  16.     char mes2[] = "World!";
  17.  
  18.     toUpperCase(mes1);
  19.     toLowerCase(mes2);
  20.  
  21.     printf("%s %s\n", mes1, mes2);
  22.  
  23.     return 0;
  24. }
  25.  
  26. void toUpperCase(char *p)
  27. {
  28.     for ( ; *p != '\0'; p++) {
  29.         if (('a' <= *p) && (*p <= 'z')) {
  30.             *p += 'A' - 'a';
  31.         }
  32.     }
  33. }
  34.  
  35. void toLowerCase(char *p)
  36. {
  37.     for ( ; *p != '\0'; p++) {
  38.         if (('A' <= *p) && (*p <= 'Z')) {
  39.             *p += 'a' - 'A';
  40.         }
  41.     }
  42. }
  43.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin 
Standard input is empty
stdout 
HELLO world!
https://ideone.com/rO0AyO
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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