PROGRAMMING:3.7 - enter four integers to display the maximum value

Write a program to calculate the maximum value of the four integers and display.
Pay attention to the if statement
[Mingjie C language exercise 3-7]
The operation is as follows:
```
Please enter four integers.
Integer 1:33
Integer 2:45
Integer 3:21
Integer 4: - 65
The maximum number is 45.
```
###Input example:
```in
thirty-three
forty-five
twenty-one
-65
```
###Output example:
```out
Please enter four integers.
Integer 1: integer 2: integer 3: integer 4: the maximum number is 45.
```







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