61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
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#include<unistd.h>
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#include<stdio.h>
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#include<stdlib.h>
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#include<signal.h>
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#include<stdint.h>
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#include<assert.h>
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uint64_t shots_in=0,shots=0;
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double x,y, pi;
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void point(){
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x = rand()/(RAND_MAX*1.0);
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y = rand()/(RAND_MAX*1.0);
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shots ++;
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if ((x*x+y*y)<=1){
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shots_in ++;
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}
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pi = ((double)shots_in)/((double)shots)*4.0;
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}
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void sig_alarm(int signum){
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printf("pi = %lf\n", pi);
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alarm(5);
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}
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void sig_int(int signum){
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char reponse;
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printf("voulez vous réellement arrêter le programme ? (y/n)\n");
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scanf("%c", &reponse);
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if (reponse == 'y'){
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exit(0);
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}
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}
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void sig_quit(int signum){
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shots_in = 0;
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shots = 0;
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point();
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}
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int set_signal_handler(int signo, void (*handler)(int)) {
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struct sigaction sa;
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sa.sa_handler = handler; // call `handler` on signal
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sigemptyset(&sa.sa_mask); // don't block other signals in handler
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sa.sa_flags = SA_RESTART; // restart system calls
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return sigaction(signo, &sa, NULL);
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}
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int main(int argc, char **argv)
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{
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shots_in = 0;
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shots = 0;
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set_signal_handler(SIGALRM,sig_alarm);
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set_signal_handler(SIGINT, sig_int);
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set_signal_handler(SIGQUIT, sig_quit);
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alarm(5);
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for (;;){
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point();
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}
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}
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