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// sputbackc example
#include <iostream> // std::cin, std::cout, std::streambuf, std::streamsize
#include <cstdio> // EOF
int main () {
char ch;
std::streambuf * pbuf = std::cin.rdbuf();
std::cout << "Please, enter some letters and then a number: ";
do {
ch = pbuf->sbumpc();
if ( (ch>='0') && (ch <='9') )
{
pbuf->sputbackc (ch);
long n;
std::cin >> n;
std::cout << "You entered number " << n << '\n';
break;
}
} while ( ch != EOF );
return 0;
}
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