Question

C Program Help! Easy question! .. hard for me. please help!

Objective: Modify the scan.c example from my notes so that it reads in a double and a long instead of a float and an int. Also, initialize the two variables so that they do not contain "junk" at the beginning of the program

Original: See image ->>http://imgur.com/iW9m7ye

What I have tried so far: See image ->> http://imgur.com/K9MBGtT

Xcode is attempting to help me, but I think its confused ... or maybe I am. I understand that a Double is %f and Long Double is %Lf

Answer 1

I got a clean compile and it ran properly with this code:

```
#include <stdio.h>

int main()
{
double x;
puts( "Enter a float: " );
scanf( "%lf", &x );
printf( "X == %f\n", x);

return( 0 );
}
```

Answer 2

Xcode is trying to warn you that you are using the float specifier instead of the "%d" int specifier.

On another note, using scanf() is unsafe. Use a safer way to read the string into your program like fgets() and convert via scanf() or strtol()/strtod().
Example:

Answer 3

The Example is in main.c attachment.