how to check for chars?

Okay, I have to somehow check an integer value for a character or punctuation character. The catch is that the variable has already been read in; therefor I cannot use getch() or.. can I???

Okay, as you can see below, I read in a value and store it as a float, after I store it as a float, I check and see if it is actually a float (double) value. If it is .0, then I know it is an integer so I convert the float to an integer and return 0 to main() to let it know that the user has entered a valid integer.

currently I have the following which checks for float values and it works as long as a period is not entered or a character is not entered. Any ideas ? Suggestions? Again, the value is set and I cannot use getch unless I can take it from a pre-assigned variable.

Code:

---

int input_validate()  {
int guess;

double temp=12,temp2,i_part;

 temp2=temp;
 
 if (modf(temp,&i_part)>0.)    /*  Checks for a double value  */
  return -1;
 else  {
  guess=(int)temp2;  /*Stores the temp value into guess as Integer */
  if ((guess<100)&&(guess>=0))
    return 1;
  else
    return -1;
 }
}

---

Any ideas how i can check for chars and punctuation??? Thanks.

Try reading value into a string, then parsing it and converting it using atof() or atoi().

Okay, would this work correctly?

inside of a function of course:

Code:

---


int var1;
char strg[10];


strg=var1;

---

now my question is, how would I parse each individual character from that string? I understand a for loop and or a while loop, but how would I break it apart in the first place?

>>how would I parse each individual character from that string?
This prints each character one at a time. You can change it to do whatever you want.

Code:

---

for (i = 0: i < Length; i++)
{
  putchar(mystring[i]);
}

---

Well it seems that you could benefit from the ctype library. There you will find such functions as isalpha(), isspace() and so forth.

how do i get a double variable stored into a string? I cannot just let the string get thh double.

here's what i have: assume var's initialized and declared:

Code:

---

double temp=90;
char temp_str[5]
temp_str=temp;

/* OTHER CODE HERE */

for(i=0; i<N; i++)  {
        if(isdigit(temp_str[i])!=0)
        return 0;
        else
        return -1;
      }

---

>>how do i get a double variable stored into a string?
Lookup sprintf()