Numerical type flipped teaching design

Level 1: Calculate the area of ​​a square with integer side lengths

Task Description
Task for this level: Write a small program that can calculate the area of ​​a square.

Relevant knowledge
In order to complete the task of this level, you need to master:
1. Input function
2. String to integer
3. Numerical operation
4. Output function

Level 2: Calculate the area of ​​a square whose side length is a floating-point number

Task Description
Task for this level: Write a small program that can calculate the area of ​​a square.

Relevant knowledge
In order to complete the task of this level, you need to master:
1. Input function
2. String to floating point number
3. Numerical operation
4. Output function

Level 3: Calculate the area of ​​a square, and the result data type is consistent with the input

Task Description
Task for this level: Write a small program that can calculate the area of ​​a square.

Relevant knowledge
In order to complete the task of this level, you need to master:
1. Input function
2. String to computable expression
3. Numerical operation
4. Output function

Level 4: Calculate the area of ​​a square, and the output result will retain up to 4 bits