Create TimeConversion.cpp

Author: XuhuaHuang

HackerRank/TimeConversion.cpp

@@ -0,0 +1,57 @@
+/*****************************************************************//**
+ * \file   TimeConversion.cpp
+ * \brief  Test question on HackerRank platform.
+ * https://www.hackerrank.com/challenges/time-conversion/problem
+ * Given a time in 12-hour AM/PM format, convert it to 24-hour time.
+ * Passes all test cases and the code is submitted.
+ * 
+ * Command used to compile:
+ * $ g++ -o time.exe .\TimeConversion.cpp -std=c++11
+ * $ .\time.exe
+ * 
+ * \author Xuhua Huang
+ * \date   October 2021
+ *********************************************************************/
+
+#include <iostream>
+#include <stdlib.h>
+#include <string>
+
+/*
+ * Complete the 'timeConversion' function below.
+ *
+ * The function is expected to return a STRING.
+ * The function accepts STRING s as parameter.
+ */
+std::string timeConversion(std::string s) {
+    std::string result = "";
+
+    if (s.find("AM") != std::string::npos && stoi(s.substr(0, 2)) == 12) {
+        result = s.erase(8, 2);
+        result = s.replace(0, 2, "00");
+    }
+    else if (s.find("PM") != std::string::npos && stoi(s.substr(0, 2)) == 12) {
+        result = s.erase(8, 2);
+    }
+    else if (s.find("AM") != std::string::npos) {
+        result = s.erase(8, 2);
+    }
+    else if (s.find("PM") != std::string::npos) {
+        result = s.erase(8, 2);
+        result = s.replace(0, 2, std::to_string((stoi(s.substr(0, 2)) + 12)));
+    }
+
+    return result;
+}
+
+int main()
+{
+    std::string s;
+    std::getline(std::cin, s); // get the 12-hour format time from the user
+
+    std::string result = timeConversion(s);
+
+    std::cout << result << "\n";
+
+    return 0;
+}