# 创建音频线程 defaudio_thread():whileTrue:ifnot ch.get_queue():forxinrange(BUFFERSIZE):ifx%BLOCKSIZE==0:outbuf=m.process(inbuf)samples[selector][x][0]=outbuf[(x%BLOCKSIZE)*2]samples[selector][x][1]=outbuf[(x%BLOCKSIZE)*2+1]ch.queue(sounds[selector])selector=int(not selecto...
A while loop in C++ is an example of an entry-controlled loop wherein the condition is checked at the entry of the loop. The loop runs until the condition is true, and the statements/ block of code inside the body of the loop are executed. The loop terminates as soon as the ...
importselect# 创建一个select对象selector=select.select([sys.stdin],[],[])# 循环等待输入whileTrue:# 等待输入ready_to_read,_,_=selector.select()# 如果有数据可读ifready_to_read:# 读取输入command=raw_input().lower()# 处理输入ifcommand=="commands":print'"look around"'print'"explore"'print...
x NUMBER :=1; BEGIN WHILE x<=10 LOOP DBMS_OUTPUT.PUT_LINE('X的当前值为:'||x); x:= x+1; END LOOP; END; 三 数字式循环 1 语法: [<<循环标签>>] FOR 循环计数器 IN [ REVERSE ] 下限 .. 上限 LOOP 要执行的语句; END LOOP [循环标签]; 每循环一次,循环变量自动加1;使用关键字REVER...
loop x := x + 1; y := y + x; if x = 100 then exit; end if; end loop; dbms_output.put_line(y); end; —for循环 –语法结构: declare –声明部分 begin –逻辑部分 for 循环变量 in 循环下限 … 循环上限 loop –循环体 end loop; ...
5 rows in set (0.00 sec) 一行就是执行结果,实际的作用和使用while编写的存储过程一样,都是插入5行数据。 再来看一下第三个循环控制语句LOOP……END LOOP。编写一个存储过程程序如下: mysql> create procedure pro12() -> begin -> declare i int default 0; ...
WHILE <布尔表达式> LOOP 要执⾏的语句;END LOOP;2 例⼦：DECLARE x NUMBER :=1;BEGIN WHILE x<=10 LOOP DBMS_OUTPUT.PUT_LINE('X的当前值为:'||x);x:= x+1;END LOOP;END;三数字式循环 1 语法：[<<循环标签>>]FOR 循环计数器 IN [ REVERSE ] 下限 .. 上限 LOOP 要执⾏的语句;END ...
⼀、for变量in开始数值...结束数值 loop end loop；⼆、while条件 loop end loop；loop的使⽤⽅式：⼀、X := 100;LOOP X := X + 10;IF X > 1000 THEN EXIT;END IF END LOOP;Y := X;⼆、 X := 100;LOOP X := X + 10;EXIT WHEN X > 1000;X := X + 10;END LOOP;...
In the following example, while loop calculates the sum of the integers from 0 to 9 and after completing the loop, else statement executes. x = 0; s = 0 while (x < 10): s = s + x x = x + 1 else : print('The sum of first 9 integers : ',s) Copy...
GOTO repeat_loop; --当x的值小于9时,就goto到repeat_loop END IF; END; / ORACLE中的FOR循环用法 DECLARE X number; --声明变量 BEGIN x:=1; --给初值 FOR X IN REVERSE 1..10 LOOP --reverse由大到小 DBMS_OUTPUT.PUT_LINE('内:x='||x); ...