《C語言程序設(shè)計》課件chapter4-answer

PAGE3-第四章循環(huán)程序設(shè)計參考答案一、選擇題（把正確選項的字母標(biāo)號填到表格中）題號1234567891011121314151617181920答案CBBBACBDBCDDCCBADBDB二、判斷題（錯的填×，對的填√）題號1234567891011121314151617181920答案√√√√××√√√√√×√√√√√×××三、應(yīng)用題1.把實現(xiàn)以下功能的for語句寫在表格中。題號for語句（1）inti

;for(i=6

;i<=66

;i+=2)printf(“%d,”,i);printf(“\b\n”);（2）inti

;for(i=7

;i<=67

;i+=2)printf(“%d,”,i);printf(“\b\n”);（3）inti

,s;for(i=1,s=0;i<=15

;i++)s+=i;printf(“%d\n”,s);（4）inti

,s;for(i=15,s=0;i<=45

;i++)if(i%2==0)s+=i;printf(“%d\n”,s);（5）inti

,n,s;for(i=n=1,s=0;n<=50;i+=3,n++)s+=i;printf(“%d\n”,s);2.把以下程序的執(zhí)行結(jié)果寫在表格中（注意結(jié)果的格式）。題號執(zhí)行結(jié)果（1）<><><>#（2）#######*##**#***（3）a=8,b=223.改寫程序題（1）把while語句轉(zhuǎn)換成for和do-while語句。（2）把for語句轉(zhuǎn)換為while和do-while語句。for(x=1;x<100;x++)printf("%ｄ＼n",x);（3）把do-while語句轉(zhuǎn)換為while和for語句。x=0;do{printf("%ｄ＼n",x);x++;}while(x<100);題號改寫后的語句（1）fordo-whilescanf("%ｄ",&x);for(;x!=9999;){printf("%ｄ＼n",x);scanf("%ｄ",&x);}scanf("%ｄ",&x);do{printf("%ｄ＼n",x);scanf("%ｄ",&x);}while(x!=9999);（2）whiledo-whilex=1;while(x<100){printf("%ｄ＼n",x);x++;}x=1;do{printf("%ｄ＼n",x);x++;}while(x<100);（3）forwhilefor(x=0;x<100;x++)printf("%ｄ＼n",x);x=0;while(x<100){printf("%ｄ＼n",x);x++;}四、編程題1.#include"stdio.h"intmain(void){ doublea,b,c,result; inti; a=2,b=1,result=0; for(i=1;i<=50;i++) { result+=a/b; c=a+b,b=a,a=c; } printf("Result=%.10f\n",result); return0;}2.#include"stdio.h"#include"math.h"intmain(void){ inti=2; intj; intk=1; doublex; doublecosx=1; doublefac; printf("Enterx(radian):"); scanf("%lf",&x); do { fac=1; for(j=1;j<=i;j++) fac*=j; fac=pow(x,i)/fac; k=-k; cosx+=k*fac; i+=2; }while(fabs(fac)>=0.000000001); printf("cos(%.3f)=%.5f\n",x,cosx); return0;}3.#include"stdio.h"intmain(void){ int