# TCS Coding Practice Question | Checking Leap Year

Given a number N, the task is to check if N is a Leap Year or not using Command Line Arguments.

Examples:

```Input: N = 2000
Output: Yes

Input: N = 1997
Output: No
``` Approach:

• Since the number is entered as Command line Argument, there is no need for a dedicated input line
• Extract the input number from the command line argument
• This extracted number will be in String type.
• Convert this number into integer type and store it in a variable, say N
• Now check for the below conditions:
• if N is multiple of 400 and
• if N is multiple of 4 and not multiple of 100

If both of the above conditions are true, then N is a leap year, else not

Program:

## C

 `// C program to check if N is a leap year ` `// using command line arguments ` ` `  `#include ` ` `  `#include /* atoi */ ` ` `  `// Function to check ` `// if year is a leap year or not ` `int` `isLeapYear(``int` `year) ` `{ ` ` `  `    ``// Return 1 if year is a multiple ` `    ``// 0f 4 and not multiple of 100. ` `    ``// OR year is multiple of 400. ` `    ``if` `(((year % 4 == 0) ` `         ``&& (year % 100 != 0)) ` `        ``|| (year % 400 == 0)) ` `        ``return` `1; ` `    ``else` `        ``return` `0; ` `} ` ` `  `// Driver code ` `int` `main(``int` `argc, ``char``* argv[]) ` `{ ` ` `  `    ``int` `n; ` ` `  `    ``// Check if the length of args array is 1 ` `    ``if` `(argc == 1) ` `        ``printf``(``"No command line arguments found.\n"``); ` `    ``else` `{ ` ` `  `        ``// Get the command line argument and ` `        ``// Convert it from string type to integer type ` `        ``// using function "atoi( argument)" ` `        ``n = ``atoi``(argv); ` ` `  `        ``// Check if n is a leap year ` `        ``if` `(isLeapYear(n) == 1) ` `            ``printf``(``"Yes\n"``); ` `        ``else` `            ``printf``(``"No\n"``); ` `    ``} ` ` `  `    ``return` `0; ` `} `

## Java

 `// Java program to check if N is a leap year ` `// using command line arguments ` ` `  `class` `GFG { ` ` `  `    ``// Function to check ` `    ``// if year is a leap year or not ` `    ``public` `static` `int` `isLeapYear(``int` `year) ` `    ``{ ` ` `  `        ``// Return 1 if year is a multiple ` `        ``// 0f 4 and not multiple of 100. ` `        ``// OR year is multiple of 400. ` `        ``if` `(((year % ``4` `== ``0``) ` `             ``&& (year % ``100` `!= ``0``)) ` `            ``|| (year % ``400` `== ``0``)) ` `            ``return` `1``; ` `        ``else` `            ``return` `0``; ` `    ``} ` ` `  `    ``// Driver code ` `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` ` `  `        ``// Check if length of args array is ` `        ``// greater than 0 ` `        ``if` `(args.length > ``0``) { ` ` `  `            ``// Get the command line argument and ` `            ``// Convert it from string type to integer type ` `            ``int` `n = Integer.parseInt(args[``0``]); ` ` `  `            ``// Check if n is a leap year ` `            ``if` `(isLeapYear(n) == ``1``) ` `                ``System.out.println(``"Yes"``); ` `            ``else` `                ``System.out.println(``"No"``); ` `        ``} ` `        ``else` `            ``System.out.println(``"No command line "` `                               ``+ ``"arguments found."``); ` `    ``} ` `} `

Output:

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