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  1. #include <stdio.h>
  2.  
  3. int myIsDigit(int character)
  4. {
  5.     return character >= '0' &&
  6.            character <= '9';
  7. }
  8.  
  9. int myIsAlpha(int character)
  10. {
  11.     return (character >= 'A' &&
  12.             character <= 'Z') ||
  13.            (character >= 'a' &&
  14.             character <= 'z');
  15. }
  16.  
  17. int myIsAlnum(int character)
  18. {
  19.     return myIsDigit(character) ||
  20.            myIsAlpha(character);
  21. }
  22.  
  23. int myIsXDigit(int character)
  24. {
  25.     return (character >= '0' &&
  26.             character <= '9') ||
  27.            (character >= 'A' &&
  28.             character <= 'F') ||
  29.            (character >= 'a' &&
  30.             character <= 'f');
  31. }
  32.  
  33. int myIsLower(int character)
  34. {
  35.     return character >= 'a' &&
  36.            character <= 'z';
  37. }
  38.  
  39. int myIsUpper(int character)
  40. {
  41.     return character >= 'A' &&
  42.            character <= 'Z';
  43. }
  44.  
  45. int myToLower(int character)
  46. {
  47.     if (myIsUpper(character))
  48.     {
  49.         return character + ('a' - 'A');
  50.     }
  51.  
  52.     return character;
  53. }
  54.  
  55. int myToUpper(int character)
  56. {
  57.     if (myIsLower(character))
  58.     {
  59.         return character - ('a' - 'A');
  60.     }
  61.  
  62.     return character;
  63. }
  64.  
  65. int myIsSpace(int character)
  66. {
  67.     return character == ' ' ||
  68.            character == '\n' ||
  69.            character == '\t' ||
  70.            character == '\r' ||
  71.            character == '\f' ||
  72.            character == '\v';
  73. }
  74.  
  75. int myIsPunct(int character)
  76. {
  77.     if (!myIsAlnum(character) &&
  78.         character != ' ' &&
  79.         character >= 32 &&
  80.         character <= 126)
  81.     {
  82.         return 1;
  83.     }
  84.  
  85.     return 0;
  86. }
  87.  
  88. int myIsPrint(int character)
  89. {
  90.     return character >= 32 &&
  91.            character <= 126;
  92. }
  93.  
  94. int myIsGraph(int character)
  95. {
  96.     return character >= 33 &&
  97.            character <= 126;
  98. }
  99.  
  100. int main(void)
  101. {
  102.     char character;
  103.  
  104.     printf("Enter a character: ");
  105.     scanf("%c", &character);
  106.  
  107.     printf("myIsDigit = %d\n",
  108.            myIsDigit(character));
  109.  
  110.     printf("myIsAlpha = %d\n",
  111.            myIsAlpha(character));
  112.  
  113.     printf("myIsAlnum = %d\n",
  114.            myIsAlnum(character));
  115.  
  116.     printf("myIsXDigit = %d\n",
  117.            myIsXDigit(character));
  118.  
  119.     printf("myIsLower = %d\n",
  120.            myIsLower(character));
  121.  
  122.     printf("myIsUpper = %d\n",
  123.            myIsUpper(character));
  124.  
  125.     printf("myIsSpace = %d\n",
  126.            myIsSpace(character));
  127.  
  128.     printf("myIsPunct = %d\n",
  129.            myIsPunct(character));
  130.  
  131.     printf("myIsPrint = %d\n",
  132.            myIsPrint(character));
  133.  
  134.     printf("myIsGraph = %d\n",
  135.            myIsGraph(character));
  136.  
  137.     printf("myToLower = %c\n",
  138.            myToLower(character));
  139.  
  140.     printf("myToUpper = %c\n",
  141.            myToUpper(character));
  142.  
  143.     return 0;
  144. }
Success #stdin #stdout 0s 5348KB
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stdin
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Standard input is empty
stdout
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Enter a character: myIsDigit = 0
myIsAlpha = 0
myIsAlnum = 0
myIsXDigit = 0
myIsLower = 0
myIsUpper = 0
myIsSpace = 0
myIsPunct = 0
myIsPrint = 0
myIsGraph = 0
myToLower = 
myToUpper =
https://ideone.com/vPmxEW
language:
C (gcc 8.3)
created:
3 hours ago
visibility:
public

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