diff options
Diffstat (limited to 'OLD/csci4061/110920_breakout/chap8/pgm_8_5.c')
-rw-r--r-- | OLD/csci4061/110920_breakout/chap8/pgm_8_5.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/OLD/csci4061/110920_breakout/chap8/pgm_8_5.c b/OLD/csci4061/110920_breakout/chap8/pgm_8_5.c new file mode 100644 index 0000000..b20cdfa --- /dev/null +++ b/OLD/csci4061/110920_breakout/chap8/pgm_8_5.c @@ -0,0 +1,43 @@ +// Program 8.5 + +#include <math.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> + +static volatile sig_atomic_t doneflag = 0; + +/* ARGSUSED */ +static void setdoneflag(int signo) { + doneflag = 1; +} + +int main (void) { + struct sigaction act; + int count = 0; + double sum = 0; + double x; + + act.sa_handler = setdoneflag; /* set up signal handler */ + act.sa_flags = 0; + if ((sigemptyset(&act.sa_mask) == -1) || + (sigaction(SIGINT, &act, NULL) == -1)) { + perror("Failed to set SIGINT handler"); + return 1; + } + + while (!doneflag) { + x = (rand() + 0.5)/(RAND_MAX + 1.0); + sum += sin(x); + count++; + printf("Count is %d and average is %f\n", count, sum/count); + sleep(3); + } + + printf("Program terminating ...\n"); + if (count == 0) + printf("No values calculated yet\n"); + else + printf("Count is %d and average is %f\n", count, sum/count); + return 0; +}
\ No newline at end of file |