Converting a char* to int, why is that so hard?!?!

Code:

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int main()
{
char* c = "123456";
int i = atoi(c[3]);
//i = (int)c[3];
//i = atoi((char*)c[3]);
//i = atoi((char)c[3]);
//char cc = (char)c[3]; i = atoi(cc);
//none works, what in the... ........ing me off!

cout << i;

return 0;
}

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Thats basically what I want to do, I want "int i" to have the c[3] number, which is "4"...

What on Gods green earth am I doing wrong? I mean.... Always getting the error "invalid conversion from char to char*". :(

The error means just what it says: atoi expects a char*; c[3] is a char. They are not the same thing, and can't be used interchangeably. If you just want to convert a single character, then atoi is not for you (a single character is not a string). The traditional way to convert a single character is to subtract '0' from the value of the character.

Thanks, but next time instead of writing two lines which actually don't answer my question, just write the little "snippet" down instead?
For instance:
int i= char[4]-'0';

Because, I know what you said, even subtracting '0', but how come the teacher included:
#include <cstdlib> // itoa
When I don't really need it??? Hm... Maybe I should have said this in the first post, oh... 6AM do that to you! :)

Quote:

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Originally Posted by ManyTimes

Because, I know what you said, even subtracting '0', but how come the teacher included:
#include <cstdlib> // itoa
When I don't really need it??? Hm... Maybe I should have said this in the first post, oh... 6AM do that to you! :)

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He could be jerking you around.
He could be incompetent.
But first, are you sure that you've read and understood the assignment correctly?

Quote:

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Originally Posted by ManyTimes

Thanks, but next time instead of writing two lines which actually don't answer my question, just write the little "snippet" down instead?

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tabstop actually answered your question, as you asked it.

S/he can't be held responsible if you asked for one thing but wanted another.

Also, bear in mind, that this site is not a free "do my homework" resource.

Quote:

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Thanks, but next time instead of writing two lines which actually don't answer my question, just write the little "snippet" down instead?

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O_o

How about next time you not waste everyone's time by posting a question you claim you know the answer to?

Not that I'm going to help. You've pretty much guaranteed that I'm not going to bother with you.

Soma

Two quotes...

Quote:

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Originally Posted by ManyTimes

What on Gods green earth am I doing wrong? I mean.... Always getting the error "invalid conversion from char to char*".

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Quote:

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Originally Posted by tabstop

The error means just what it says: atoi expects a char*; c[3] is a char. They are not the same thing, and can't be used interchangeably. If you just want to convert a single character, then atoi is not for you (a single character is not a string). The traditional way to convert a single character is to subtract '0' from the value of the character.

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You know what the character "?" means? (See, there it is!) It marks the end of a QUESTION. You asked a question what you were doing wrong. Tabstop writes two perfectly clear lines on what you did wrong. And then you complain that he didn't answer your question?
Be thankful, don't be a prick.

ManyTimes, if you asked a question while you wanted to ask another. you
shouldnt ignore the good answer and blame the helper (tabstop) for something
you are the responsible, either say thanks and then ask your real question or
dont ask anything at all