1、西南財經大學王磊2021-12-222P循環體YN當當P為真為真循環體循環體P循環體YN當當P為真為真循環體循環體當型循環兩種方式當型循環兩種方式P循環體NY直到直到P為真為真循環體循環體P循環體Y直到直到P為真為真循環體循環體直到型循環兩種方式直到型循環兩種方式N2021-12-2232021-12-224P循環體YN2021-12-225P循環體YN2021-12-226循環起始條件循環起始條件通常對循環通常對循環變量賦初值變量賦初值循環終了條件循環終了條件(每次執行循環每次執行循環語句前需判別語句前需判別)循環增量循環增量循環語句執行循環語句執行完一次后計算表完一次后計算表達式達式3的值

2、的值(1) 計算表達式計算表達式1,計算表達式計算表達式2。假設表達式。假設表達式2的值的值0不滿足終了條件不滿足終了條件, 那么執行循環語句那么執行循環語句, 假設表達式假設表達式2的值的值=0，那么終了循，那么終了循環；環；執行循環語句；執行循環語句；(3) 計算表達式計算表達式3, 再次判別表達式再次判別表達式2的值的值.依此反復下去依此反復下去,直到直到表達式表達式2的值的值=0(假假)。2021-12-227for ( i=1; i=100; i+) sum+=i;2021-12-2282021-12-2292021-12-22102021-12-22112021-12-221220

3、21-12-2213i+;while (i=n);2021-12-22142021-12-2215magic = rand()%b + a; 2021-12-22162021-12-22172021-12-22182021-12-2219While循環語句的嵌套；循環語句的嵌套； while ( ) while ( ) for ( ; ; ) while ( ) do while ( ); 2021-12-22202021-12-22211234567891234567892468101214161836912151821242748121620242832365101520253035404

4、5612182430364248547142128354249566381624324048566472918273645546372812021-12-222281726354453627189726456484032241686356494235282114754484236302418126454035302520151053632282420161284272421181512963181614121086429876543219876543212021-12-222381726354453627189645648403224168494235282114736302418126252

5、0151051612849634219876543212021-12-2224817263544536271896456484032241684942352821147363024181262520151051612849634219876543212021-12-22252021-12-22262021-12-2227假假真真break表達式1表達式2循環語句后循環語句后的下一條語句的下一條語句循環語句后的下一條語句假假真真 表達式1表達式2continue2021-12-22282021-12-22292021-12-22302021-12-22312021-12-22322021-12-22332021-12-22342021-12-22352021-12-22362021-12-22372021-12-223820