C++ Invalid conversion from

Question

I'm trying to solve this problem and i get such an error [ Invalid conversion from 'char' to 'const char' ] ,but i can't figure out how to solve it. Here are the lines in which the problem is :

Declarations:
string alp("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
string formatted;
char partoftext[20];
size_t found;

found = text.copy(partoftext,2,0);
partoftext[found] = '\0';
a = atoi(partoftext);
formatted.append(alp[a]);

...

and the problem is in this line of code :

formatted.append(alp[a]);

thanks.

you do not give enough context. what is formatted? what is the error? what is a? — Not_a_Golfer, Apr 16 '12 at 07:26
It would help if you indicated which line was giving the error. It would help even more if you condensed the code down to a complete module, which we could copy/paste and compile (or try to compile) directly. — James Kanze, Apr 16 '12 at 07:37
i've indicated the line which gives the error, and told what error. — ddacot, Apr 16 '12 at 07:41

score 4 · Accepted Answer · answered Apr 16 '12 at 07:35

4

From :http://www.cplusplus.com/reference/string/string/append/

formatted.append(1, alp[a]);

/*
string& append ( const string& str );
string& append ( const string& str, size_t pos, size_t n );
string& append ( const char* s, size_t n );
string& append ( const char* s );
string& append ( size_t n, char c );
*/

answered Apr 16 '12 at 07:35

AlexTheo

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one more question, why it's showing zeroes instead of letters? http://ideone.com/92d5F – ddacot Apr 16 '12 at 07:49
It is not a 0 but 'O'. Also you could use supstr instead of copy and stringstream instead of atoi-> or take a look on boost::lexical_cast http://stackoverflow.com/questions/8065413/stdlexical-cast-is-there-such-a-thing – AlexTheo Apr 16 '12 at 08:10

score 0 · Answer 2 · answered Apr 16 '12 at 07:36

0

If my guess is correct (and it's a guess because you don't specify what the error actually is), try:

formatted.append(alp, a, 1);

answered Apr 16 '12 at 07:36

Not_a_Golfer

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C++ Invalid conversion from

2 Answers2