atof() acting weird?

[Mellowz]

This is how the program is setup.

The atof() function isn't working the way it should, and is producing bogus numbers. Any idea's?

Normally I'd just start with a float, but this is for a bigger program. I just made a little script that re-produces this problem for me. Any idea's?

#include <stdio.h>

int main(void)
{
    char test[100];
    double num = 0;


    printf("Testing number: ");
    gets(test);
    
    num = atof(test);
    printf("num = %.2f\n", num);

    return 0;
}

Results:

Testing number: 45
num = 2293232.00

Thanks,
Mellowz

[Prelude]

Perhaps you should include stdlib.h.

[Link_26]

Noob question...What atof() function was the program using since the header wasn't included, or why didn't the compiler complain?


And gets() ftw

[Prelude]

>What atof() function was the program using since the header wasn't included
Undefined behavior.

>or why didn't the compiler complain?
It probably didn't have warnings set high enough.

>And gets() ftw

[jafet]

Don't use gets. It's too safe. Use fgets. It's more dangerous. Why