isgraph() Prototype
int isgraph(int ch);
The isgraph() function checks if ch has a graphical representation as classified by the current C locale. By default, the following characters are graphic:
- Digits (0 to 9)
- Uppercase letters (A to Z)
- Lowercase letters (a to z)
- Punctuation characters (!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~)
The behaviour of isgraph() is undefined if the value of ch is not representable as unsigned char or is not equal to EOF.
It is defined in <cctype> header file.
isgraph() Parameters
ch: The character to check.
isgraph() Return value
The isgraph() function returns non zero value if ch is graphic, otherwise returns zero.
Example: How isgraph() function works
#include <cctype>
#include <iostream>
using namespace std;
int main()
{
char ch1 = '$';
char ch2 = '\t';
isgraph(ch1)? cout << ch1 << " has graphical representation" : cout << ch1 << " does not have graphical representation";
cout << endl;
isgraph(ch2)? cout << ch2 << " has graphical representation" : cout << ch2 << " does not have graphical representation";
return 0;
}
When you run the program, the output will be:
$ has graphical representation
does not have graphical representation