Scanf and integer...

Hi,

I am trying to obtain a number using scanf. But, I want to make sure the input is only integer, not characters. I have made some progress on C, but its loopping indefieniently and have some errors.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>


int get_number(void);


int get_number()
{
int check = 0, number = 0;

do
{
if( check > 0 )
{
if (number < 0)
{
printf("Not permitted!!! \n");
printf("Number value cannot < 0 \n");
}

}

fflush(stdin);
printf("\n");
printf("Please enter a number: ");
scanf( "%d", &number);

while ( (scanf ("%d", &number) ) == 0)
{
printf("Entered value is not integer");
printf("Please enter a number: ");
scanf( "%d", &number);
fflush (stdin);
}

check = 1;

} while ( ( (scanf ("%d", &number) ) == 0) || (number < 0) );

return 0;
}

that's perfectly fine,

However, I prefer not to use scanf as it will ruin the rest of the code...

I'm trying to work this out by using the above code... can you help me?

Quote:

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Originally posted by penny
that's perfectly fine,

However, I prefer not to use scanf as it will ruin the rest of the code...

I'm trying to work this out by using the above code... can you help me?

---

What? Make up your mind. Above you said you wanted to use scanf. So do you, or don't you? It can't be both.

Quote:

---

fflush(stdin);

---

Don't flush input streams. It's wrong.

Quzah.

You cannot use scanf() to test for invalid input, as it will leave that in the input buffer. For example, entering 9z0 will result in scanf() reading in the 9 and stopping. The functions return code will be 1 denoting success.

To test properly, use fgets() and strtol(), all as per the FAQ.