Added a C++ for Problem 12

ProjectEuler/C++/Problem12.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <cmath>
+#include <chrono>
+
+unsigned long countDivisors(unsigned long number);
+
+int main(){
+	bool found = false;
+	unsigned long sum = 1;
+	unsigned long counter = 2;
+	const unsigned long goalDivisors = 500;
+
+	std::chrono::high_resolution_clock::time_point startTime = std::chrono::high_resolution_clock::now();
+	while(!found){
+		if(countDivisors(sum) > goalDivisors){
+			found = true;
+		}
+		else{
+			sum += counter;
+			++counter;
+		}
+	}
+	std::chrono::high_resolution_clock::time_point endTime = std::chrono::high_resolution_clock::now();
+	--counter;
+
+	std::cout << "The triangular number " << sum << " is made with all number >= " << counter << " and has " << countDivisors << " divisors" << std::endl;
+	std::cout << "The problem took " << std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::duration(endTime - startTime)).count() << " milliseconds" << std::endl;
+
+	return 0;
+}
+
+unsigned long countDivisors(unsigned long number){
+	unsigned long numDivisors = 0;
+	for(int cnt = 0;cnt * cnt < number;++cnt){
+		//if((number % cnt) == 0){
+		if(fmod((double)number, (double)cnt) == 0){
+			numDivisors += 2;
+		}
+	}
+	return numDivisors;
+}