isdigit()Prototype: int isdigit(int Character);Header File: ctype.h (C) or cctype (C++) Explanation: This function accepts an ASCII value, and returns whether or not it is a digit (0 to 9) when converted to its equivalent ASCII character. It returns a zero if it is not a digit, and non-zero if it is. Example:
//Example reads in a character and checks to see if it is a digit
#include <cctype>
#include <iostream>
using namespace std;
int main()
{
char a_char;
cin>>a_char;
if(isdigit(a_char))
{
cout<<"Is a digit!";
}
else
{
cout<<"Is not a digit!";
}
}
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