1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
// basic_istream::peek example
#include <iostream> // std::cin, std::cout
#include <string> // std::string
#include <cctype> // std::isdigit
int main () {
std::cout << "Please, enter a number or a word: ";
std::cout.flush(); // ensure output is written
std::cin >> std::ws; // eat up any leading white spaces
std::istream::int_type c;
c = std::cin.peek(); // peek character
if ( c == std::char_traits<char>::eof() ) return 1;
if ( std::isdigit(c) )
{
int n;
std::cin >> n;
std::cout << "You entered the number: " << n << '\n';
}
else
{
std::string str;
std::cin >> str;
std::cout << "You entered the word: " << str << '\n';
}
return 0;
}
|