August
1999 QUESTION 3 Total Marks: 20 Marks |
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| In C, there is no
special type to represent a string. Instead, a string is simply an array of the standard
type char, and it is the responsibility of the programmer to ensure that they allocate,
manipulate and delete these arrays correctly.
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| (a) | Give a simple declaration for a string which
consists of maximum of 10 letters.
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[1] |
| (b) | Implement the library function int strlen(const char* str) which returns the number of characters in the string str.
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[4] |
| (c) | Implement the library function char* strlchr(const char* str, char aChar) which returns a pointer to the first (leftmost) occurrence of the character aChar in the string str. If no such character is found, the function should return NULL.
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[5] |
| (d) | Without reversing the string, implement the
library function char* strrchr(const char* str, char aChar) which returns a pointer to the last (rightmost) occurrence of the character aChar in the string str. If no such character is found, the function should return NULL.
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[5] |
| (e) | Using your definition of strlchr, implement
the function int strmember(const char* str, const char* set) where the function will which returns 1 if the string str consists solely of characters that are contained in set. The order in which the characters appear can differ, therefore there is no implication of equality.
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[5] |