Loop Statement 6

Loop statement
C language while do-while for GOTO (unconditional loop)
1. For Loop
For (expression 1; expression 2; expression 3) {statement };
// The condition can be omitted; the two semicolons cannot be omitted.
// If no condition exists, it indicates an infinite loop.
Expression 1: indicates the initialization of the loop condition.
Expression 2: the condition that controls the loop.
Expression 3: Change the cyclic variable. Tend to end
Exercise: print numbers between 1 and 10
For statement execution process:
Expression 1 assigns a value to the cycle factor when the first cycle enters,
Execute only once. Expression 1 is executed, and expression 2 is judged.
True or not. If it is true, it enters the loop body and the execution ends.
Expression 3, and then execute expression 2 to determine whether it is true. If it is true, it enters the loop body,
Execute expressions 3 and 2 repeatedly until expression 2 is false and the loop ends.
Common for loop types:
For (I = 0; I <n; I ++ ){}
For (I = 0; I <= N; I ++ ){}
For (I = N; I> 0; I --){}
For (I = n-1; I> = 0; I --){}
Exercise: print an odd number from one to one hundred
Modify the first line
200 lines of code per day
<3> Print the wildcard Formula 1*2-1 or 1*2 + 1

Exercise: print one to ten square tables
11
24
39
416
CTRL + C command to end the endless loop and exit

A comma expression is used to calculate the value of each expression at a time. If a value is assigned
Value assigned to variable
Exercise: 3. Calculate the total score and average score of students;
The number of students is required to be customized by the user.
Tip: first, let the user enter the number of students
(Int count = 0)
Read the scores of each student cyclically and calculate the total scores.
For (; I <count; I ++)
Sum/count

For (I = 1; I <10; I ++ ){
For (j = 1; j <= I; j ++)
{
}
}

Functions of nested loops:
Use the outer loop variable to control the number of inner loops;
Exercise: print the 9-9 multiplication table

 

5. The break keyword jumps out or ends.
Enter the year, month, and day to calculate the day of the year.
Goto
Break: Jump out or loop (branch switch)
Continue: continue. Terminate this cycle and enter the next cycle

Print the number between 1 and 30 that cannot be divided by four

While loop do while: WHILE LOOP
While (expression condition) {statement ;}

While (9); is equivalent to for (;) an endless loop.
Do {statement block, multiple statements} while (); Do not forget the last semicolon

Exercise: complete the days. C code with verification
2. Enter five Integers to find the largest

3. Use do while to determine the number of digits in an integer
4. Question: enter an integer to print the binary

 

2. Enter five numbers
Scanf
A> B
A> C
A <d

Every time I have to review, I have to study for 1 hour after the teacher finishes the course,
Consolidate first