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Module DEMO-32-57DEMO-C-32

Time Addition

DEMO-C-32 • Programming in C

Browser-only practice

Problem Statement

Time Addition (24-hour format, Next Day)

You are given a time in 24-hour format (HH MM) and a duration in minutes (k). Your task is to compute the resulting time after adding the duration to the initial time.

If the resulting time is past midnight (i.e., it falls on the next day), append Next day to the output.

Examples

  • Adding 25 minutes to 23:50 results in 00:15 Next day
  • Adding 30 minutes to 10:05 results in 10:35

Notes

  • Use proper formatting with leading zeros for hours and minutes (e.g., 05:07)
  • You may find the modulo operator (%) helpful for handling time wraparound

Constraints

0 ≤ HH ≤ 23 0 ≤ MM ≤ 59 0 ≤ k ≤ 2000

Input Format

Input consists of:

  • A line containing two integers HH and MM, representing the starting time in 24-hour format.
  • A second line containing a single integer k, the number of minutes to add.

Output Format

Output the resulting time in HH:MM format.

If the result is past midnight (i.e., the next day), append Next day to the output line.

Example outputs:

  • 10:35
  • 00:15 Next day

Sample Testcases

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Sample #1
Public sample
Input
23 50
25
Output
00:15 Next day
Explanation
Adding 25 minutes to 23:50 results in 00:15 the next day.
Sample #2
Public sample
Input
22 45
75
Output
00:00 Next day
Explanation
Adding 75 minutes to 22:45 results in exactly midnight the next day.
Sample #3
Public sample
Input
10 05
30
Output
10:35
Explanation
Adding 30 minutes to 10:05 results in 10:35 on the same day.

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