Question

Need help creating a basic java string program using nested if/else, return loops or while loops or charAt methods while returning information using a console, Please leave notes as to compare my program and see where I went wrong or could've used a different method.

secondsAfterMidnight

Input: String that represents time of day

Returns: integer number of seconds after midnight (return -1 if String is not valid time of day)

General time of day format HH:MM:SS(AM/PM)

These are examples where when input the return value is answered in a console:

// Input String Return Value

// "12:34:09AM" 2049

// "12:00:00PM" 43200 (common noon)

// "12:00:02am" 2 (AM/PM case insensitive)

// "3:03:03Pm" 54183 (two digit MM and SS required)

// "7:11:03A" -1

// "7:11:3AM" -1

// "7:91:73PM" -1

// "23:45:12" -1 (do not allow 24 hour clock format)

public static int secondsAfterMidnight(String) {

Answer 1

Note:

In case of any issue please comment

//################### PGM START ###################

import java.util.Scanner;

public class TimeCalculation {
  
   //function to calculate seconds after midnight
   public static int secondsAfterMidnight(int h,int m,int s,String t){
      
       int result=-1;
       //checking the value of hour minute and second
       if(h>12 || m>60 || s>60){
           result=-1;
       }
       //if the time is in pm
       else if(t.equalsIgnoreCase("pm")){
           int hour;
           //if the time is less than 12 clk then add value upto 12 clk
           if(h<12)
               hour=(12*60*60)+(h*60*60);
           else
               hour=(h*60*60);
           int minute=m*60;
           int second=s;
           result=(hour+minute+second);
       }
       //if the time is in am
       else if(t.equalsIgnoreCase("am")){
           int hour;
           //if the time is 12 clk hours will be 0
           if(h==12)
               hour=0;
           else
               hour=(h*60*60);
           int minute=m*60;
           int second=s;
           result=(hour+minute+second);
       }
      
       //return result
       return result;
   }

  
   //main method
   public static void main(String[] args) {
       //result hold the number of seconds after midnight
       int result=0;
      
       //requesting input from user
       Scanner s=new Scanner(System.in);
       System.out.println("Enter the time{HH:MM:SS(AM/PM)}: ");
       String input=s.nextLine();
      
       //splitting input based on :
       String values[]=input.split(":");
      
       //getting the hours
       int hour=Integer.parseInt(values[0]);
      
       //verifying minute is of length 2 and seconds+am is of length 4
       if(values[1].length()!=2){
           result=-1;
       }else if(values[2].length()!=4){
           result=-1;
       }else{
           //getting the minute value
           int minute=Integer.parseInt(values[1]);
           //getting am/pm
           String t=values[2].substring(2, 4);
           if(!(t.equalsIgnoreCase("am") || t.equalsIgnoreCase("pm"))){
               result=-1;
           }else{
               //getting the seoncd
               int second=Integer.parseInt(values[2].substring(0, 2));
               //calculating seonds after midnight after primary format check
               result=secondsAfterMidnight(hour,minute,second,t);
           }
       }
      
       System.out.println("Seconds after midnight ="+result);
      
      
       s.close();

   }

}

//############## PGM END #########################################

OUTPUT
##########