c++习题答案中国电力出版社

1C程序设计教程习题答案第三章顺序结构程序设计3写出下列程序的运行结果。（1）程序INCLUDEVOIDMAINFLOATD32INTX,YX12YX38/50COUTINCLUDEVOIDMAINDOUBLEF,DLONGLINTII20/3F20/3L20/3D20/3COUTVOIDMAININTC11,C22,C3C310/C2C1COUTVOIDMAININTA1,B2AABBABAABCOUTVOIDMAININTI,J,M,NI8J10MINJCOUTINCLUDEVOIDMAININTA3,B4,C5,U51274,N128765FLOATX12,Y24,Z36CHARC1A,C2BCOUTINCLUDEVOIDMAINFLOATR,H,ZC,MJ,BMJ,TJCINRHZC2RPIMJRRPIBMJ4PIRRRTJ30/40PIRRRCOUTINCLUDEVOIDMAINFLAOTC,FCOUTFC50/90F32COUTCAC/1009B1COUTVOIDMAININTM5IFM5COUTVOIDMAININTA1,B3,C5,D4,XIFAVOIDMAINFLOATX20,YIFXVOIDMAININTA4,B5,C0,DDACOUTVOIDMAININTX,YCOUTXYIFXYIFXYCOUTY“VOIDMAINVOIDINTDAYCINDAYSWITCHDAYCASE0COUTVOIDMAININTS，T，A，BCINABS1T1IFA0SS1IFABTS1ELSEIFABT5ELSET2SCOUT0并且A10写一个程序，输入X值，输出Y值。提示根据X的取值范围判断计算Y的公式，可使用IFELSE语句进行多重判断。程序INCLUDEVOIDMAINFLOATX,YCINXIFXVOIDMAINFLOATA,B,C,T,DCINABCIFANUMIFNUMVOIDMAINFLOATGCINGSWITCHINTG/10CASE10CASE9COUT1000000时，超过100万的部分按照1提成，从键盘输入当月利润I，求应发放奖金总数。要求（1）用IF语句编程序；（2）用SWITCH语句编程序。提示计算利润时注意不同利润的不同提成比例。例如，利润为15万时，其中10万元按照10的比例提成，另外5万元按照75提成。程序（1）使用IF语句编程实现INCLUDEINCLUDEVOIDMAINLONGIFLOATBONUS,BON1,BON2,BON4,BON6,BON10BON110000001BON2BON11000000075BON4BON2200000005BON6BON4200000003BON10BON64000000015COUTIIFIINCLUDEVOIDMAINLONGIFLOATBONUS,BON1,BON2,BON4,BON6,BON10INTCBON110000001BON2BON11000000075BON4BON2200000005BON6BON4200000003BON10BON64000000015COUTICI/100000IFC10C10SWITCHCCASE0BONUS10000001BREAKCASE1BONUSBON1I1000000075BREAKCASE2CASE3BONUSBON2I200000005BREAKCASE4CASE5BONUSBON4I400000003BREAKCASE6CASE7CASE8CASE9BONUSBON6I6000000015BREAKCASE10BONUSBON10I1000000001BREAKCOUTVOIDMAININTNUM0WHILENUMVOIDMAININTI,J,X0FORI0IVOIDMAININTA,BFORA1,B1A10BREAKIFB31B3COUT13VOIDMAININTI,SUM0FORI1IVOIDMAINVOIDINTN,RIGHT_DIGIT,NEWNUM0COUTNCOUTVOIDMAININTNFLOATSS10FORN10N1NSS1/NCOUT1NCSS1/NDCOUTVOIDMAININTS0,A1,N14CINNDOS1AA2WHILEANCOUTVOIDMAININTN,KFLOATSCORE,SUM,AVESUM00FORN1NSCORESUMSCOREAVESUM/40COUTVOIDMAININTN1,N2CINN2WHILEN20N1N210N2N2/10COUTVOIDMAININTM,N,T,ICOUTMNIFMNTMMNNTFORI1IVOIDMAININTN,I,J,KFORN100NVOIDMAININTN,SUM,IFORN2NINCLUDEVOIDMAININTI,T,L20FLOATM2,N1,SUM0FORI1IINCLUDEVOIDMAINFLOATS100,H100INTNFORN2NUSINGNAMESPACESTDINTA,BVOIDFINTJSTATICINTIAINTM,NMIJJINIJACOUTUSINGNAMESPACESTDFLOATSQRFLOATARETURNAAFLOATPFLOATX,INTNCOUTCHARZHCHARC1CHARC2C2C132RETURNC2VOIDMAINCHARC1,C2CINC1C2ZHC1COUTINTGYSINTM,INTNINTI,TIFMMNCOUTINCLUDEUSINGNAMESPACESTD21INTSUBINT,INTVOIDMAININTNUM,K,NCOUTNUMKNSUBNUM,KCOUTUSINGNAMESPACESTDINTSUBINT,INTVOIDMAININTNUM,K,NCOUTNUMKNSUBNUM,KCOUT22USINGNAMESPACESTDINTPRIMEINTMINTYES1,JFORJ2JVOIDDYINTXVOIDMAININTXCOUTXDYXVOIDDYINTXINTI,JFORI0I0,M0其中，没M、N为正整数。设计程序求ACM2,1、ACM3,2。INCLUDEINTACMINTM,INTNIFM0RETURNN1ELSEIFN0RETURNACMM1,1ELSERETURNACMM1,ACMM,N1VOIDMAININTM,N,KM2,N1COUTINLINEINTSZZFCHARC1IFC10IFSZZFC1COUTVOIDMAININTYSINT,INTFLOATYSFLOAT,FLOATINTM,NFLOATA,BCOUTMNCOUTABCOUTINCLUDE/为AREAH文件所在的绝对路径VOIDMAINFLOATR25FLOATA,BCOUTRCOUTABCOUT0FORI0I0P2W1FORI0I0FORI0I0FORI0IUSINGNAMESPACESTDINTMAININTM,AMA01COUTUSINGNAMESPACESTDINTMAINCONSTINTM10INTAMA01COUTUSINGNAMESPACESTDINTMAININTA5CINACOUTUSINGNAMESPACESTDINTMAININTA5CINA4COUTUSINGNAMESPACESTDINTMAINCHARC10“IAMASTUDENT“COUTUSINGNAMESPACESTDINTMAINCHARC“IAMASTUDENT“COUTUSINGNAMESPACESTDINTMAINCHARA5,PINTIPAFORI0IPICOUTUSINGNAMESPACESTDINTMAINCHARA6,PINTIPAFORI0IPIA50COUTUSINGNAMESPACESTD29INTMAININTI,K,A10,P3K5FORI0IUSINGNAMESPACESTDINTMAININTY25,I0,J,A8DOAIY2IYY/2WHILEY1FORJI1J0JCOUTINCLUDEUSINGNAMESPACESTDINTMAININTT341,2,3,4,5,6,7,8,9,I,JFORI0IUSINGNAMESPACESTDINTMAINCHART320“WATERMELON“,“STRAWBERRY“,“GRAPE“INTIFORI0IUSINGNAMESPACESTDINCLUDEVOIDSORTINTA,INTN31INTI,J,TFORI0IUSINGNAMESPACESTDINCLUDEVOIDMAININTA20,I,W_MAX,W_MIN,NCOUTNFORI0IAIW_MAX0W_MIN0FORI1IAIW_MAXIELSEIFAW_MINUSINGNAMESPACESTDDEFINEM100INTMAININTAM,I,J,W,T,NCOUTN32COUTAIFORI0IUSINGNAMESPACESTDINTMAININTA10,TOP,BOTTOM,MIDDLE,I,XBOOLFCOUTAICOUTXTOP0,BOTTOM9,FFALSEWHILETOPUSINGNAMESPACESTDINTMAININTA5,I,WCOUTAIWA0FORI1IUSINGNAMESPACESTDINCLUDEINTMAININTA10,I,J,S,FCOUTAIS0FORI0IUSINGNAMESPACESTDINTMAININTI,J,ROW,COL,MAX,A45COUTAIJMAXA00,ROW0,COL0FORI0IUSINGNAMESPACESTDINTMAININTI,J,COL,MAX,A45,F,F1COUTAIJF10FORI0IAJCOLF0BREAKIFF135F11COUTUSINGNAMESPACESTDINTMAININTI,J,A45,SUMCOUTAIJFORJ0JUSINGNAMESPACESTDINTMAINCHARSTR120,STR220,KINTICOUT0COUTUSINGNAMESPACESTDINCLUDEINTMAINCHARSTR20,B,E,KCOUTINCLUDEUSINGNAMESPACESTDINTMAININTC20,SUM,I,NINTPCOUTNCOUTPISUM0FORI0IINCLUDEUSINGNAMESPACESTDINTMAININTA55,SUMINTPSUM0FORPA0PPSUMPCOUTUSINGNAMESPACESTDINTMAINCHARS120,S220,P_S2S2,P_S1S1COUTUSINGNAMESPACESTDINTMAININTM,N,GY,GBVOIDJSINT,INT,INT,INTCOUTMNJSM,N,38COUTUSINGNAMESPACESTDINTMAINCHARSTR30VOIDZHCHARCOUTA39DEFINEM20INTMAININTAMM,I,J,NVOIDYHINTM,INTCOUTNYHA,NFORI0IVOIDMAININTV,BVB100VBCOUTVOIDFUNINTX40COUTVOIDASTINTX,INTY,INTCP,INTDPCPXYDPXYVOIDMAININTA,B,C,DA2B3ASTA,B,COUTVOIDMAININTA10,B0,PA,PBPAPBCOUTCHARSTRCHRCHARSTRING,INTLETTERWHILESTRINGLETTERRETURNSTRINGVOIDMAININTTT1WHILETTCHARTITLE64COUTTITLECHARPCOUTCHPSTRCHRTITLE,CHIFPCOUTTT42文件习题参考答案一、改错1文件DYDAT中有一批非负整数，要求将DYDAT中的偶数挑出来，写到文件OTDAT中。指出程序中有错的地方，并改正。INCLUDEUSINGNAMESPACESTDINTMAININTBIFSTREAMINFILE,OUTFILEINFILEOPEN“DYDAT“OUTFILEOPEN“OTDAT“INFILEBWHILEB0IFB20OUTFILEBINFILECLOSEOUTFILECLOSERETURN0正确程序INCLUDEINCLUDEUSINGNAMESPACESTDINTMAININTBIFSTREAMINFILEOFSTREAMOUTFILEINFILEOPEN“DYDAT“OUTFILEOPEN“OTDAT“,IOSOUTINFILEBWHILEB0COUTBINFILECLOSEOUTFILECLOSERETURN0432从键盘输入五个整数，将其用二进制形式写入到文件FDAT中，然后将这五个数从文件中读出，并在显示器上输出。INCLUDEINCLUDEUSINGNAMESPACESTDINTMAININTA,IOFSTREAMOUTFILE“FDAT“,IOSOUT|IOSBINARYFORI0IAOUTFILEWRITECHAROUTFILEOPEN“FDAT“,IOSIN|IOSBINARYFORI0IINCLUDEUSINGNAMESPACESTDINTMAININTA,IOFSTREAMOUTFILE“FDAT“,IOSOUT|IOSBINARYIFSTREAMINFILE“FDAT“,IOSIN|IOSBINARYFORI0IAOUTFILEWRITECHAROUTFILECLOSEFORI0IINCLUDEUSINGNAMESPACESTDINTMAININTA,IOFSTREAMOUTFILE“AT1DAT“,IOSOUTFORI0IAOUTFILEINCLUDEUSINGNAMESPACESTDINTMAININTA,IIFSTREAMINFILE“AT1DAT“,IOSINOFSTREAMOUTFILE“AT2DAT“,IOSOUTFORI0IAOUTFILEINCLUDEUSINGNAMESPACESTDINTMAININTA,I,NOFSTREAMOUTFILE“FDAT“,IOSOUT|IOSBINARYCOUTNFORI0IAOUTFILEWRITECHAR45OUTFILECLOSERETURN0基本知识（1）以下叙述中正确的是A输入项可以是一个实型常量，如SCANF（“F，”35）B只有格式控制，没有输入项，也能正确输入数据到内存，例如SCANF（“AD，BD”）；C当输入一个实型数据时，格式控制部分可以规定小数点后的位数，例如SCANF（“42F”，4下列程序的输出结果是A3B32C0D307MAINDOUBLED32INTX,YX12YX38/50PRINTF“DN“,DY5下列程序执行后的输出结果是小数点后只写一位A666060B66676746C666067D666760MAINDOUBLEDFLOATFLONGLINTIIFLD20/3PRINTF“DLDFFN“,I,L,F,D6下列程序的运行结果是AA2,B5BA2,B5CAD,BDDAD,BDINCLUDEMAININTA2,C5PRINTF“AD,BDN“,A,C7语句PRINTF“ABREHIYBOUN“的输出结果是AABREHIYBOUBABREHIYBOUCREHIYOUDABREHIYBOU说明B是退格符8若变量A、I已正确定义，且I已正确赋值，合法的语句是AA1BICAA5DAINTI9若有以下程序段，INTC11,C22,C3C310/C2C1则执行后，C3中的值是A0B05C1D210有如下程序MAIN0INTY3,X3,Z1PRINTF“DDN”,X,Y,Z2运行该程序的输出结果是A34B42C43D3311以下程序的输出结果是。MAINUNSIGNEDSHORTA65536INTBPRINTF“DN”,BA12若有定义INTA10,B9,C8接着顺序执行下列语句后，变量B中的值是。CAB5CA11B34713若A为INT类型，且其值为3，则执行完表达式AAAA后，A的值是A3B9C12D614若变量已正确说明为FLOAT类型，要通过语句SCANF“FFF“,给A赋于100，B赋予220，C赋予330，不正确的输入形式是A102233B100,220,330C100220330D10223315以下程序的输出结果是MAININTA1,B2AABBABAABPRINTF“D,DN“,A,B16下列程序的输出结果是1600，请填空。MAININTA9,B2FLOATX,Y11,ZZA/2BX/Y1/2PRINTF“52FN“,Z17以下合法的赋值语句是AXY100BDCXYDCINTAB18设正X、Y均为整型变量，且X10Y3，则以下语句的输出结果是PRINTF“D,DN“,X,YA10,3B9,3C9,2D10,219X、Y、Z被定义为INT型变量，若从键盘给X、Y、Z输入数据，正确的输入语句是AINPUTX、Y、ZBSCANF“DDD“,CSCANF“DDD“,X,Y,ZDREAD“DDD“,20以下程序的输出结果是MAININTA3PRINTF“DN“,AAAA48A6B12C0D12（21）语句XXXX1XLX，执行后都使变量X中的值增1，请写出一条同一功能的赋值语句（不得与列举的相同）。22以下程序段的输出结果是INTA1234；PRINTF“2DN“,AA12B34C1234D提示出错、无结果23若有说明语句INTA,B,C,DBSCANF“DDD“,CSCANF“DDD“,A,B,DDSCANF“DDD“,A,B,D24在16位C编译系统上，若定义LONGA，则能给A赋40000的正确语句是AA2000020000；BA400010；CA3000010000DA4000L10L25若定义INTA511,B,则PRINTF“DN“,B的输出结果为A无确定值BA的地址C512D51126以下程序的输出结果是MAININTA5,B4,C6,DPRINTF“DN“,DABACACBA5B4C6D不确定（27以下程序的输出结果是。MAININTA177PRINTF“ON“,A28以下程序的输出结果是。MAININTA0AA8PRINTF“DN“,A答案1D、2D、3D、4C、5A、6B、7C、8B、9A、10D、110、123、13C、14B、15（2,1）、4916（66）、17B、18D、19B、20D、21（X1）、22C、23A、24D、25D、26C、27（261）、2816基本知识_选择结构1有以下程序INCLUDEMAININTA,B,C246AC/1009B1PRINTF“D,DN“,A,B输出结果是A2,1B3,2C4,3D2,1（2）以下程序输出结果是，A）7B）6C）5D）4MAIN（）INTM5；IF（M5）PRINTF“DN”，MELSEPRINTF“DN”，M（3）当A1，B3，C5，D4时，执行下面一段程序后，X的值为A）1B）2C）3D）6IF（AB）SCANF“D，D”，S1T1IFA0SS1IFABTS1ELSEIFABT5ELSET2SPRINTF“TDN”，T6设INTX1,Y1表达式X|Y的值是A0B1C2D17与YX01X0Y1BIFXELSEIFX0Y1ELSEY0ELSEIFX0IFX0Y1IFX0Y1ELSEIFX0Y0ELSEY1ELSEY18若X为INT类型,请以最简单的形式写出与逻辑表达式X等价的C语言关系表达式9能正确表示逻辑关系“A10或A0”的C语言表达式是AA10ORA0|A10SCANF“D“,IFXXWXMM50PRINTF“D“,AIFA40PRINTF“D“,AIFA30PRINTF“D“,A23以下程序的输出结果是MAININTA5,B4,C6,DPRINTF“DN“,DABACACB53A5B4C6D不确定选择结构答案1A2B3B4D5C6B7A8X0|X19D10A11C12C13X5|X10BREAKIFX21X5CONTINUEX3A2B4C6D8562假定A和B为INT型变量,则执行以下语句后B的值为A1B10DOBAAWHILEB3JIFJ3JJJPRINTF“D“,JA6B74C8D94有以下程序VOIDMAININTI,JFORJ10J100BREAK57BFORCINTK1000DOKWHILEK1000DINTS36WHILESS（9）执行语句FOR（I1；I，则输出结果为AM3BM2CM1DM0VOIDMAININTM,NPRINTF“ENTERM,N“SCANF“DD“,WHILEMNWHILEMNMNWHILENMNMPRINTF“MDN“,M（2000年4月）12以下循环体的执行次数是A3B2C1D0MAININTI,JFORI0,J1I20BREAKWHILEA1415下面程序的功能是计算1到10之间奇数之和及偶数之和,请填空。INCLUDEMAININTA,B,C,IAC0FORI0IMAININTI,JFORI0_IJI106IF_CONTINUEPRINTF“D“,J200095917有如下程序MAININTI,SUMFORI1I6NPRINTF“D”,N该程序段的输出结果是A987B876C8765D987620要使以下程序段输出10个整数，请填入一个整数。FORI0I,则以下WHILE循环体将执行_次。WHILECHGETCHAREPRINTF“”2001422有以下程序段INTK0WHILEK1KWHILE循环执行的次数是A无限次B有语法错，不能执行C一次也不执行D执行1次23以下程序执行后SUM的值是A15B14C不确定D）0MAININTI,SUMFORI1I10BREAKIFB31B3CONTINUEPRINTF“DN“,AA101B6C5D4（28）以下程序运行后的输出结果是_。MAININTI10,J0DOJJIIWHILEI2PRINTF“DN“,J29设有以下程序MAININTN1,N261SCANF“D“,WHILEN20N1N210N2N2/10PRINTF“D“,N1程序运行后，如果从键盘上输入1298；则输出结果为_。2002430以下程序中，WHILE循环的循环次数是MAININTI0WHILEI0IAI10IPRINTF“DDD“,A2,A5,A8A258B741C852D3692有以下程序MAININTP711,13,14,15,16,17,18,I0,K0WHILEI1NSS1/NPRINTF“64FN“,S程序运行后输出结果错误，导致错误结果的程序行是CAS10BFORN10N1NCSS1/NDPRINTF“64FN“,S4有以下程序MAININTS0,A1,NSCANF“D“,DOS1AA2WHILEANPRINTF“DN“,S若要使程序的输出值为2，则应该从键盘给N输入的值是BA）1B）3C）5D）05以下程序的输出结果是（B）MAININTI,K,A10,P3K5FORI0I，则输出为（B）INCLUDEMAINCHARCHWHILECHGETCHARNIFCHASIFI100BREAK10以下程序中，WHILE循环的循环次数是DMAININTI0WHILEI6NPRINTF“D“,N该程序段的输出结果是BA987B876C8765D987616以下叙述正确的是DADOWHILE语句构成的循环不能用其它语句构成的循环来代替。BDOWHILE语句构成的循环只能用BREAK语句退出。C用DOWHILE语句构成的循环,在WHILE后的表达式为非零时结束循环。D用DOWHILE语句构成的循环,在WHILE后的表达式为零时结束循环。17以下程序的输出结果是DMAININTA,BFORA1,B1A10BREAKIFB31B3PRINTF“DN“,AA101B6C5D418有如下程序MAININTA331,2,3,4,5,6,I,J,S0FORI1ISTRUCTSTUDENT67CHARNAME10INTNUMFLOATSCOREVOIDMAINSTRUCTSTUDENTSTU10INTIFORI0ISTUINAMECOUTSTUINUMCOUTSTUISCORECOUTSTRUCTDATEINTYEAR,MONTH,DAYVOIDMAINSTRUCTDATEDAINTI,DAYS0INTM130,31,28,31,30,31,30,31,31,30,31,30,31CINDAYEARDAMONTHDADAYIFDAYEAR40FORI1I2RETURNFIBN1FIBN2ELSERETURN2MAIN0PRINTF“DN”,FIB3该程序的输出结果是A2B4C6D810以下函数用来求出两整数之和，并通过形参将结果传回，请填空。VOIDFUNCINTX,INTY,ZZXY11以下程序的输出结果是。INTD3；FUN（INTP）INTD5；DDP；PRINTF（“D”，D）；MAIN（）INTA2；FUN（A）；DDA；PRINTF（“D”,D）12以下所列的各函数首部中，正确的是CAVOIDPLAYVARINTEGER,VARBINTEGERBVOIDPLAYINTA,BCVOIDPLAYINTA,INTBDSUBPLAYAASINTEGER,BASINTEGER13以下程序的输出结果是CA0B29C31D无定值FUNINTX,INTY,INTZZXXYYMAININTA3171FUN5,2,APRINTF“D“,A14以下程序的输出结果是AA1B2C3D4LONGFUNINTNLONGSIFN1|N2S2ELSESNFUNN1RETURNSMAINPRINTF“LDN“,FUN315函数PI的功能是根据以下近似公式求值10/II/611/221/331/NN现在请你在下面的函数中填空，完成求的功能。INCLUDE“MATHH”DOUBLEPILONGNDOUBLES00LONGIFORI1IDOUBLEFUNDOUBLEX,INTYINTIDOUBLEZFORI1,ZXIVOIDFINTNMAINVOIDFINTNF5VOIDFINTNPRINTF“DN“,N则以下叙述中不正确的是A若只在主函数中对函数F进行说明，则只能在主函数中正确调用函数FB若在主函数前对函数F进行说明，则在主函数和其后的其它函数中都可以正确调用函数FC对于以上程序，编译时系统会提示出错信息提示对F函数重复说明D函数F无返回值，所以可用VOID将其类型定义为无值型24以下程序的输出的结果是CINTX3MAININTIFORI1I11FORJI1J0JPRINTF“D”，AJPRINTF“N”3执行下面的程序段后,变量K中的值为AA不定值B33C30D10INTK3,S2S0KKS1104若有以下调用语句,则正确的FUN函数的首部是CAVOIDFUNINTM,INTXBVOIDFUNINTS,INTH41CVOIDFUNINTP,INTSDVOIDFUNINTN,INTAMAININTA50,NFUNN,5有如下程序DMAININTN50,0,0,I,K2FORI0I0I,PRINTF“DN”,NK该程序的输出结果是A不确定的值B2C1D07