Thread: Isspace ??? Anyone Know?

123

>>I get a double value from another function
>>and return a value of 1 if it is a double.
Eh?

There is no function overloading in C, so this is as close as you get without using a structure or a void pointer.

Code:

int function( int i, float f, int status )
{
    if( status != 0 )
    {
        /* use the integer */
        return 1;
    }
    else
    {
        /* use the float */
    }
    return 0;
}

Call it:

function ( 0, myFloat, 0 ); /*use a float */
function( myInt, 0.0, 1 ); /* use an int */

Quzah.

>>This function has to determine what it is.
Like quzah said, the function can't determine that, you have to tell it up front. Thats what the parameter types are for.

How can you not know what you're processing? Surely you're getting the value from some place. If it's user input, validate it first, then pass the correct data to the appropriate function. You can't just not know what you're dealing with and expect it to work.

Example: I have a data file that contains 300 bytes of information. What is it? See how impossible that question is? You have to tell it what you're reading. Bytes are just bytes. They can "be" anything you want. It doesn't mean the values are accurate, just that you can access the bytes of data.

Quzah.

Originally posted by justin69enoch
The user will input a number. if it is a float, I need to reject the input and tell them that it is invalid; that is basically what I am doing. But the thing is, if I just limit integers from 0 - 500, and someone enters 10.3, it will simply round it to 10 and store 10 as a value rather than reporting an error. ??? any suggestions?

Then your answer is simple. You have to read the input from the keyboard with fgets(), into a char array. Then you perform you own custom validation on the data to ensure its what you expected. Or maybe this function will help you do some of the work too.

Okay, this is what I have so far... It only accepts one char per enter... If i use fgets, won't all it do is store the string into one allocated spot in an array? If so, how would I be able to verify that a '.' is not in the string itself?

I know this is a stupid thing for you guys, but I am really trying to learn this stuff. All help is appreciated and again, i thank you for the quick responses. This forum is really great to get help.

Code:

#define SIZE 2

int main()  {
  char A[SIZE];
  char text; 
  int sum,count=0;  

  printf("Enter Data: "); 
  scanf(" %c", &text);
  
  while (count<SIZE)  {
     if (text != '.')  {
       A[count]=text;
       printf("Checksum:  %c  %d\n\n",sum,sum);
       scanf(" %c", &text);
       count++;
     }
     else  {
       printf("this is an error!\n"
       break; \
     }
  }

}

Try doing a board search, you never know what you might find

Code:

#include <ctype.h>
#include <stdio.h>
#include <math.h>

int is_float(double num);

int main(void)
{
double temp;

printf("Enter a integer: ");
scanf("%lf",&temp);
while (is_float(temp))
{
   printf("Invalid input.  Please enter an integer: ");
   scanf("%lf",&temp);
}

return 0;
}

int is_float(double num)
{
   double ipart;
   if (modf(num,&ipart) > 0.)
      return 1;
   return 0;
}