From 3b4b04c3bbfc78a617dda623b4911eb3d5f8edaf Mon Sep 17 00:00:00 2001
From: Kevin Lyda <kevin@ie.suberic.net>
Date: Thu, 12 Oct 2017 20:02:47 +0100
Subject: [PATCH] Shows timer info.
---
cube-test.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/cube-test.c b/cube-test.c
index 8ede1e7..b394d0f 100644
--- a/cube-test.c
+++ b/cube-test.c
@@ -8,6 +8,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
+#include <sys/time.h>
int
random_two_digit_number() {
@@ -29,16 +30,41 @@ read_number() {
return atoi(buf);
}
+typedef struct timer_struct {
+ struct timeval then;
+} timer_t;
+
+void
+start_timer(timer_t *timer) {
+ gettimeofday(&timer->then, NULL);
+}
+
+long int
+end_timer(timer_t *timer) {
+ struct timeval now;
+ long int delta;
+
+ gettimeofday(&now, NULL);
+ delta = (now.tv_sec - timer->then.tv_sec) * 1000000;
+ delta += now.tv_usec - timer->then.tv_usec;
+
+ return delta;
+}
+
int
main(int argc, char *argv[]) {
int guess, number;
+ timer_t timer;
+ long int delta;
srand(time(NULL));
while (1) {
number = random_two_digit_number();
printf("Number is %d. Cube root (0 to exit)? ", cube(number));
+ start_timer(&timer);
guess = read_number();
+ delta = end_timer(&timer);
if (guess == 0) {
exit(0);
}
@@ -47,5 +73,12 @@ main(int argc, char *argv[]) {
} else {
printf("Not correct. Number was %d.\n", number);
}
+ if (delta < 1000) {
+ printf("Took %ldus\n", delta);
+ } else if (delta < 1000000) {
+ printf("Took %.1fms\n", delta / 1000.0);
+ } else {
+ printf("Took %.2fs\n", delta / 1000000.0);
+ }
}
}
--
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