c++ - how to increment or decrement from variable until get char -

i wanted create snake program in console application. in 1 confused. problem this:

#include <iostream> #include <cstdlib> #include <ctime> #include <conio.h> using namespace std; int main() {     int a=2000;     while (1) {         cout << time(0)<<endl;         -= 100;         _sleep(a);       **if (getch())break;         else continue;     } } 

my problem in **, want ,to while loop until pressed 1 key. example want run this: print time(). = 1900. wait 1.9s. print time(). a=1800. wait 1.8 s. // pressed key. break.//end program

so found answer used kbhit() in conio.h library.

you may try this. of course need in parent process have getchar() return key press without waiting, such using _getchar().

#include <iostream> #include <cstdlib> #include <ctime> #include <signal.h> #include <conio.h> using namespace std; int main() {     pid_t id;     id = fork();     if(id)     {       getchar();       kill(id, sigterm);     }     else     {         int a=2000;         while (1) {             cout << time(0)<<endl;             -= 100;             _sleep(a);           /*if (getch())break;             else continue;             */         }     } }