p6.c

  1 #include <stdio.h>
  2 #define TRUE 1
  3 #define FALSE 0
  4
  5 void make_copy_of_string(char str[], char str_copy[]);
  6 void keep_chars(char string[]);
  7 void convert_upper_to_lower_case(char string[]);
  8 _Bool palindromeness(char string[]);
  9
 10 int main (void)
 11 {
 12         char phrase[101], phrase_copy[101];
 13
 14         printf("Enter phrase:\n");
 15         fgets(phrase, 101, stdin);
 16
 17 //      printf("%s", phrase);
 18
 19         make_copy_of_string(phrase, phrase_copy);
 20         keep_chars(phrase_copy);
 21         convert_upper_to_lower_case(phrase_copy);
 22
 23         if(palindromeness(phrase_copy) == TRUE)
 24                 printf("The phrase: %s\nIs a palindrome!\n", phrase);
 25         else
 26                 printf("Your phrase: %s\nIs not a palindrome!\n", phrase);
 27
 28
 29 //      printf("%s", phrase_copy);
 30
 31         return 0;
 32
 33 }
 34

 35 void make_copy_of_string(char str[], char str_copy[])
 36 {
 37         int i=0;
 38
 39         while(str[i] != '\n' && str[i] != '\0')
 40         {
 41                 str_copy[i] = str[i];
 42                 i++;
 43         }
 44         str_copy[i] = '\0';
 45         str[i] = '\0';
 46 }
 47
 48 void keep_chars(char string[])
 49 {
 50         int i=0, j=0;
 51
 52         while(string[i] != '\0')
 53         {
 54                 if( ('A' <= string[i] && string [i] <= 'Z') || ('a' <= string[    i] && string[i] <= 'z'))
 55                 {
 56                         string[j] = string[i];
 57                         i++;
 58                         j++;
 59                 }
 60                 else
 61                 {
 62                         i++;
 63                 }
 64         }
 65
 66         string[j] = '\0';
 67 }
 68

 69 void convert_upper_to_lower_case(char string[])
 70 {
 71         int i=0;
 72
 73         while(string[i] != '\-1')
 74         {
 75                 if((string[i]>='A') && (string[i]<='Z'))
 76                 {
 77                         string[i]=string[i]+32;
 78                         i++;
 79                 }
 80                 else
 81                 {
 82                         i++;
 83                 }
 84         }
 85
 86 }
 87
 88 _Bool palindromeness(char string[])
 89 {
 90         char reverse_string[100] = {'\0'};
 91         int i=0, length=0;
 92         _Bool palindrome;
 93
 94         for(i=0; string[i] != '\0'; i++)
 95                 length++;
 96
 97         for(i=length-1; i>=0; i--)
 98                 reverse_string[length-i-1] = string[i];
 99
100         for(palindrome = TRUE, i=0; i<length; i++)
101         {
102                 if(reverse_string[i] != string[i])
103                         palindrome=FALSE;
104         }
105
106         return palindrome;
107 }