isxdigit() Prototype
int isxdigit(int ch);
The isxdigit()
function checks if ch is a hexadecimal numeric character as classified by the current C locale. The available hexadecimal numeric characters are:
- Digits (0 to 9)
- Lowercase alphabets from a to f
- Uppercase alphabets from A to F
The behaviour of isxdigit()
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.
isxdigit() Parameters
ch: The character to check.
isxdigit() Return value
The isxdigit()
function returns non zero value if ch is a hexadecimal character, otherwise returns zero.
Example: How isxdigit() function works
#include <cctype>
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
bool flag = 0;
char str[] = "50Af";
for (int i=0; i<strlen(str); i++)
{
if (!isxdigit(str[i]))
{
flag = 1;
break;
}
}
if (flag)
cout << str << " is not a valid hexadecimal number";
else
cout << str << " is a valid hexadecimal number";
return 0;
}
When you run the program, the output will be:
50Af is a valid hexadecimal number