# CREATE OWN LIBRARY

## largest number between two or three numbers

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### Description

The program is written here to design a menu-driven program to find the largest number between two or three numbers. According to the choice of the user, the inputs are taken, and then the largest number is found and printed.

For example, if the two numbers are 5 and 8, then the largest number is 8.

If the  three numbers are 5, 2, and 4 then the largest number is 5.

### Algorithm

``````INPUT: Two or Three numbers according to the user choice.

OUTPUT: The largest number among two or three numbers.

PROCESS:
Step 1: [function to find the largest between two numbers]

If a>b then
Print “a is largest”
Else
Print “b is largest”
[End of ‘if’]

Step 2: [Function to find the largest between three numbers]

Read a, b, c [three numbers]
If a>b and a>c then
Print “a is largest"
else if b>a and b>c then
Print “b is largest"
else
Print “c is largest"
[End of ‘if’]

Step 3: [Main function]
Print “1. Find the largest between two numbers
2. Find the largest between three numbers
If ch=1 then
Call the function to find the largest number between two numbers
Else If ch=2 then
Call the function to find the largest number between three numbers
Else
Print “Wrong Choice”
[End of ‘if’]

[End of ‘main’ function]

Step 4: Stop.``````

### Code

TIME COMPLEXITY:

if(a>b) ------------------------------------------- O(1)

printf("%d is largest",a);

else ---------------------------------------------- O(1)

printf("%d is largest",b);

if(a>b&&a>c) ---------------------------------- O(1)

printf("%d is largest",a);

else if(b>a&&b>c) ---------------------------- O(1)

printf("%d is largest",b);

else ----------------------------------------------- O(1)

printf("%d is largest",c);

Here, O(1) means constant time. Each ‘if’ statement and ‘else’ statement takes a constant time to execute. Therefore, the time complexity of this program is O(1).

SPACE COMPLEXITY:

The space complexity of this program is O(1) as it requires a constant number of spaces for any given input.

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