10-12c# Basics-Operator

10-12c# Basics-Operator

Pre-class assignments: the name and age of the number in the class are written and aggregated.

I. Classification of Operators

1, mathematical operators (7)

1) + (plus)

Cases:

2)-(minus)

Cases:

3) * (multiplication sign)

Cases:

4)/(Division sign)

Cases:

5)% (number, whichever is the remainder)

Cases:

6) + + (increment character) automatic operation +1

? prefix increment operator:

Cases:

Postfix increment operator:

Cases:

Although the results are the same, the difference is that:

? ,//prefix increment operator: The first operation, then the assignment, and the last semicolon is the result of the assignment.

int y=++x;

equivalent to x=x+1;

int y=x;

Cases:

',///suffix increment operator: First assignment, after operation, and final semicolon after the result of assignment

int y=x + +;

Equivalent to int y=x;

x=x+1;

Cases:

7)--(decrement character) automatic operation minus 1

The calculation method is the same as the increment operator, where only the difference between the prefix decrement operator and the Postfix decrement operator is emphasized:

Exercise 1: Calculate the area of the Circle:

2, relational operators (6). Returns only true or FALSE.

1) = =

2)! = (not equal to)

3) <

4) >

5) <=

6) >=

2, logical operators (3).

1) and (&&) equal to and, several conditions must be met before execution

2) or (| | Equivalent or, only one or a few of these conditions can be satisfied.

3) Non-(! Equivalent to No, as long as the condition does not satisfy the return of true, applied in front of the parentheses of the expression.

4. Other operators

? assignment operators

1) = (equals)

2) + = (not equal to)

3)-=

4) *=

5)%=

6)/=

?:< Span style= "font-family: ' Song body '; font-size:16pt; Mso-spacerun: ' Yes '; >x;// x>12, so X=X-12; x=x.

Example: Hourly System

Exercise 2: Judging whether a student's score is passed (60 points)

Exercise 3: Judge whether the number within 0-100 is prime?

Exercise 4: Determine whether the integer within 0-200 is related to the whole ;

Precedence of operators (top-down)

1)!

2) Arithmetic operators

+ +,--

*,/,%

+,-

3) Relational operators

<,>,<=,>=

= =,!=

4) Logical operators

&&

||

Cases:

10-12c# Basics-Operator