C++ How to find char in a char array by using find function?

Question

Hello,

How to find char in a char array by using find function? If I just for loop the vowel then I could have gotten the answer but I'm asked to use std::find.. Thanks.

bool IsVowel (char c) { 

    char vowel[] = {'a', 'e', 'i', 'o', 'u'};            
    bool rtn = std::find(vowel, vowel + 5, c);

    std::cout << " Trace : " << c  << " " << rtn << endl;

    return rtn; 
 }

Answer 1

std::find(first, last, value) returns an iterator to the first element which matches value in range [first, last). If there's no match, it returns last.

In particular, std::find does not return a boolean. To get the boolean you're looking for, you need to compare the return value (without converting it to a boolean first!) of std::find to last (i.e. if they are equal, no match was found).

Answer 2

Use:

size_t find_first_of ( char c, size_t pos = 0 ) const;

Reference: http://www.cplusplus.com/reference/string/string/find_first_of/

Answer 3

bool IsVowel (char c) { 

    char vowel[] = {'a', 'e', 'i', 'o', 'u'};
    char* end = vowel + sizeof(vowel) / sizeof(vowel[0]);            
    char* position = std::find(vowel, end, c);

    return (position != end); 
 }