crt + c continues behind the code (c ++ SIGINT)

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Presented here using c ++ SIGNT usage, namely ctr + c is sent by the operating system after an interrupt signal to the running process, by the interrupt function to choose their behavior. There will be only examples of SIGINT specific reference herein .

#include <iostream>
#include <csignal>
bool flag = true;
void exit_while(int sig)
{
  flag = false;
}
int main()
{
  signal(SIGINT, exit_while);
  while (flag)
  {
    std::cout << "while" << std::endl;
  }
  std::cout << std::endl;
  int i = 10;
  while (i-- > 0)
    std::cout << "exit while" << std::endl;
  return 0;
}

Sample Output crt + c:

while
while
while^C

exit while
exit while
exit while
exit while
exit while
exit while
exit while
exit while
exit while
exit while