Visual Studio 2017 reproduces the C language classic example (i)

1, write a program, enter a, B, c these 3 values, the largest of the output.

2. Translate "China" into a password. Password rule: Replace the original letter with the 4th letter after the original letter.
For example, the 4th letter after the letter A is e, substituting E for a, so that China should be translated as Glmre.
Please compile a procedure, with the method of assigning the initial value to make C1, C2, C3, C4, C5, the values of the 5 variables are C, h, I, N, a, after operation, so C1, C2, C3, C4, C5, respectively, G, L, M, R, E.
(This topic to write the problem-solving ideas really detailed ...) ）

3, uppercase and lowercase conversion, enter the letter A, automatic output A-Z 26 lowercase letters, a-Z 26 capital letters
(I made up this problem myself)

4, set the circle radius r=1.5, the cylinder is high h=3, the circumference is long, circle area, sphere surface area, sphere volume, cylinder volume. With scanf input data, output calculation results, the output requires a text description, take the decimal point 2 is a number. Please compile the program.

Visual Studio 2017 reproduces the C language classic example (i)