Thread: The atoi function

Well since it's a C function, the interface is exactly the same.
So you really should be able to get the jist of what is going on, even if you have only a glimmer of understanding of what cout might do.

Plus, you should use strtol() or strtoul() in place of atoi().
They have much better error detection.

Originally Posted by DaveH

The C version of atoi is used just like the C++ version. I'm not sure what you mean by using it as an alternative to printf.

What I mean is that you can't create a char array with numbers so atoi would be an alternate solution to just manually printing the numbers.

Originally Posted by Salem

Well since it's a C function, the interface is exactly the same.
So you really should be able to get the jist of what is going on, even if you have only a glimmer of understanding of what cout might do.

Plus, you should use strtol() or strtoul() in place of atoi().
They have much better error detection.

So if I understand it right, if you entered something like "123 hello" it would disregard the whitespace and letters and return 123?

Originally Posted by CommonTater

Who says you can't create a char array with numbers?

There's nothing magical about the char type, it's just a short short int ...

Code:

int main (void)
  {
     char x[3];

     x[0] = 11;
     x[1] = x[0] * 5;
     x[2] = 42;

     printf("%hhd %hhd %hhd\n", x[0], x[1], x[2]);

     return 0;
}

... go ahead, try it for yourself.

Outputs 11, 55, and 42. Thanks CommonTater, I guess I was misinformed about char arrays.