How to convert ASCII codes and letters in C language? Seek a detailed explanation

1. First, two character variables z and z are defined to store the converted characters.

2. Then, define an integer variable n and save the ASCII code for conversion.

3. Assign the value of n to the variable z to realize the conversion of characters.

4. In the output window, output the characters converted from ASCII code.

5. Reassign the variable n, whose value is ASCII code of uppercase letters.

6. Convert ASCII code into corresponding uppercase English letters and output them in the output window.

7. Run the program, and the ASCII code entered in the code is successfully converted into the corresponding uppercase and lowercase letters.