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Small change to monte_carlo.c #501

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Merged
merged 4 commits into from
Oct 17, 2018
Merged

Small change to monte_carlo.c #501

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1f81d92
Small change to monte_carlo.c
Gathros Oct 12, 2018
71054da
fixing formating
Gathros Oct 12, 2018
8a05251
small change
Gathros Oct 13, 2018
76d8625
changing to uint
Gathros Oct 14, 2018
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25 changes: 12 additions & 13 deletions contents/monte_carlo_integration/code/c/monte_carlo.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4,19 +4,18 @@
#include <stdlib.h>
#include <time.h>

bool in_circle(double x, double y, double radius) {
return x * x + y * y < radius * radius;
bool in_circle(double x, double y) {
return x * x + y * y < 1;
}

double monte_carlo(int samples) {
double radius = 1.0;
int count = 0;
double monte_carlo(unsigned int samples) {
unsigned int count = 0;

for (int i = 0; i < samples; ++i) {
double x = (double)rand() * radius / RAND_MAX;
double y = (double)rand() * radius / RAND_MAX;
for (unsigned int i = 0; i < samples; ++i) {
double x = (double)rand() / RAND_MAX;
double y = (double)rand() / RAND_MAX;

if (in_circle(x, y, radius)) {
if (in_circle(x, y)) {
count += 1;
}
}
Expand All @@ -28,9 +27,9 @@ int main() {
srand(time(NULL));

double estimate = monte_carlo(1000000);
printf("The estimate of pi is %f\n", estimate);
printf("Percentage error: %0.2f%\n", 100 * fabs(M_PI - estimate) / M_PI);

printf("The estimate of pi is %g\n", estimate);
printf("Percentage error: %0.2f%%\n", 100 * fabs(M_PI - estimate) / M_PI);

return 0;
}