Small change to monte_carlo.c (#501)

Removed radius and changed number of samples to be unsigned

Author: Gathros

contents/monte_carlo_integration/code/c/monte_carlo.c

@@ -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;
         }
     }
@@ -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;
 }