Created
October 8, 2014 17:06
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c tutorial :)
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| #include <stdio.h> | |
| int is_number(char c) | |
| { | |
| return c >= '0' && c <= '9'; | |
| } | |
| int difference() | |
| { | |
| return 'A' - 'a'; | |
| } | |
| int main(int argc, char** argv) | |
| { | |
| char* argument; | |
| int i; | |
| int non_numeric_character_index; | |
| if (argc != 2) | |
| { | |
| printf("Usage: lowercase <string>\n"); | |
| return 0; | |
| } | |
| argument = argv[1]; | |
| non_numeric_character_index = 0; | |
| for (i = 0; argument[i] != 0 ; i++) | |
| { | |
| if (!is_number(argument[i])) | |
| { | |
| argument[non_numeric_character_index++] = argument[i]; | |
| } | |
| } | |
| argument[non_numeric_character_index] = 0; | |
| printf("%s\n", argument); | |
| } |
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| #include <stdio.h> | |
| char is_uppercase_letter(char c) | |
| { | |
| return c >= 'A' && c <= 'Z'; | |
| } | |
| char difference() | |
| { | |
| return 'a' - 'A'; | |
| } | |
| int main(int argc, char** argv) | |
| { | |
| char* argument; | |
| int i; | |
| if (argc != 2) | |
| { | |
| printf("Usage: %s <string>\n", argv[0]); | |
| return 0; | |
| } | |
| argument = argv[1]; | |
| for (i = 0; argument[i] != 0 ; i++ ) | |
| { | |
| if (is_uppercase_letter(argument[i])) | |
| { | |
| argument[i] = argument[i] + difference(); | |
| } | |
| // printf("%d\n", argument[i]); | |
| } | |
| printf("%s\n", argument); | |
| } |
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| #include <stdio.h> | |
| char is_ended(char* str, int i) | |
| { | |
| return str[i] == 0; | |
| } | |
| int main(int argc, char** argv) | |
| { | |
| if (argc != 3) | |
| { | |
| printf("Usage: string_compare <string1> <string2>\n"); | |
| return 0; | |
| } | |
| char* str1 = argv[1]; | |
| char* str2 = argv[2]; | |
| for (int i = 0 ; ; i++) | |
| { | |
| if (is_ended(str1, i)) | |
| { | |
| if (is_ended(str2, i)) | |
| { | |
| printf("Equal length\n"); | |
| return 0; | |
| } | |
| else | |
| { | |
| printf("Str1 is shorter.\n"); | |
| return 0; | |
| } | |
| } | |
| if (is_ended(str2, i)) | |
| { | |
| printf("str2 is shorter\n"); | |
| return 0; | |
| } | |
| } | |
| } |
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