atoi and itoa

[Myrna]

I wrote itoa function.

#include <iostream>
#include <string>>
char ch
char name
int main()
{
char buf (10);
int somenum = 20
itoa (somenum, buf, 10
string astring = buf;
}

Error message on int main. In advance, thank you.


atoi

#include <iostream>
#include <string>

string digits = "153"
int num;

//Enter your number

int atoi (char *s);
cout << num << end1;

[weaknessforcats]

You will need to #include <locale> for the complier to accept atoi and itoa.

You are also missing some semi-colons.

Your atoi code is very bad.
Your variable is named digits but you never use it.
You have an int num which you display witout ever putting a value in the variable.
You show a function prototype for atoi but never call the function.

[Banfa]

atoi is declared in stdlib.h (or cstdlib). itoa is not declared anywhere it is not a part of the C standard library but rather an extension in some, but not all, compilers.

In general terms if you are using C++ then you should be using a stringstream not atoi, itoa or any other of the C functions to do with converting numbers to strings and strings to numbers.