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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.     while (*p != '\0') {
  29.         if (('a' <= *p) && (*p <= 'z')) {
  30.             *p += 'A' - 'a';
  31.         }
  32.         p++;
  33.     }
  34. }
  35.  
  36. void toLowerCase(char *p)
  37. {
  38.     while (*p != '\0') {
  39.         if (('A' <= *p) && (*p <= 'Z')) {
  40.             *p += 'a' - 'A';
  41.         }
  42.         p++;
  43.     }
  44. }
  45.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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Standard input is empty
stdout
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HELLO world!
https://ideone.com/wGEQH4
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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