switch()-->The expression inside the brackets switch is the keyword

1. Must be a == expression

2. On the left side of the equal sign, the expressions are the same

3. The right side of the equal sign must be a constant, and the numbers must be different from each other.

In a branch condition: Normally

Use if...else if...else for three branch conditions

For more than three branch conditions, use switch...case...default

switch...case-->Compare with the largest value

The case is followed by a constant (numeric value). If the case constant starts with 0, it is directly compared with the largest case constant.

If you start from other numbers, it is compared with the largest constant - the smallest constant.

Array addressing starts from 0

1. The case values ​​are continuous, and a case table will be created. What is placed in the table is the address of the case

2. The case values ​​are relatively continuous, and two case tables will be created. The first one is the number list, which contains the case number. If there is no case, It will fill in the number of cases, which is the corresponding default address. The second one is the address form, still filled in with the address of the case. Use the number to get the address ---> save space

3.case values ​​are discontinuous and can be compared directly, just like if Select half search (binary search) ---> Must be sorted first, look at the middle, left/right

4. The fourth situation combines the previous three

while (expression)--->while is the keyword (expression)

{

In the middle is the while statement;

}

The difference between if and while: while has one more jmp statement than if (jumps up)

while--->There must be a conditional judgment expression inside the brackets (There must be corresponding exits), otherwise it will easily cause an infinite loop.

If add a goto statement to imitate the while loop

goto-->equivalent to jmp statement

break breaks out of the loop,

continue to end this loop (an exit needs to be added), When using it, set the exit above continue. -->Otherwise, it is easy to cause an infinite loop

If the exit is below, you need to set the loop exit yourself.

Export cannot store results

continuer

do

{

} while(); do while is a keyword, and there is a semicolon after while

1. while is to judge the condition first and then execute the statement

2. do...while executes the statement first and then determines the condition

for(expression1;expression2;expression3)

{

}

for-->keyword

Expression 1--->Initialize variables You can initialize one or more

Expression 2--->Judge loop conditions

Expression 3--->Variable increment or decrement (i or i--)

A jmp will be inserted in the middle of the disassembly of the for loop and jump to the loop judgment condition.