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  1. #include <iostream>
  2. #include <cstdlib>
  3. #include <ctime>
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8.  
  9. 	int N = 100000;   // N: 抽樣的數量
  10. 	int m = 0;        // M: 落在四分之一圓的點數
  11. 	for (int i = 1; i <= N; i++) {
  12.  
  13. 		double x = (double) rand() / RAND_MAX;
  14. 		double y = (double) rand() / RAND_MAX;
  15.  
  16. 		if (x * x + y * y < 1) {
  17. 			m++;   //若該點落在四分之一內則 M++
  18. 		}
  19.  
  20. 	}
  21. 	cout << "pi~ " << 4.0 * m / N << endl;
  22. 	return 0;
  23. }
Success #stdin #stdout 0.01s 5280KB
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Standard input is empty
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pi~ 3.14152
https://ideone.com/NfPw11
language:
C++ (gcc 8.3)
created:
131 days ago
visibility:
public

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