Added a new Problem convert 24hr clock to 12hr clock with detailed ex…

…plaination and code

P-Problem Statements & Solution/1-Level 1/24hrTo12hrFormat.cpp

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+//Link to the Question: https://www.geeksforgeeks.org/convert-time-from-24-hour-clock-to-12-hour-clock-format/
+
+
+//The approach to solving this problem requires some observations.
+//First that the minutes and seconds will be same in both the cases.
+//The only change will be in the hours and according to that Meridien will be appended to the string.
+//For hours, first convert it from string to int datatype, then take its modulo with 12 and that will be our hours in 12-hour format. Still, there will be a case when hour becomes 00 i.e (12 or 00 in 24-hour format) which we need to handle separately.
+
+
+//Below is the implementation of above approach:
+
+#include <bits/stdc++.h>
+using namespace std;
+
+// Convert Function which takes in 24hour time and convert it to 12 hour format
+void convert12(string str)
+{
+    // Get Hours
+    int h1 = (int)str[0] - '0';
+    int h2 = (int)str[1] - '0';
+
+    int hh = h1 * 10 + h2;
+
+    // Finding out the Meridien of time ie. AM or PM
+    string Meridien;
+    if (hh < 12) {
+        Meridien = "AM";
+    }
+    else
+        Meridien = "PM";
+
+    hh %= 12;
+
+    // Handle 00 and 12 case separately
+    if (hh == 0) {
+        cout << "12";
+
+        // Printing minutes and seconds
+        for (int i = 2; i < 8; ++i) {
+            cout << str[i];
+        }
+    }
+    else {
+        cout << hh;
+        // Printing minutes and seconds
+        for (int i = 2; i < 8; ++i) {
+            cout << str[i];
+        }
+    }
+
+    // After time is printed cout Meridien
+    cout << " " << Meridien << '\n';
+}
+
+// Driver code
+int main()
+{
+
+    string str;
+    cout << "Enter time (24 hr format): ";
+    cin >> str;
+
+    convert12(str);
+
+    return 0;
+}