C语言程序设计现代方法第二版第五章课后编程习题全部答案

C语⾔程序设计现代⽅法第⼆版，第五章课后编程习题全部答案皆编译通过，但可能存在些遗漏，仅供参考其余章节还没有学习，持续稳定缓慢更新中..5.1#include<stdio.h>intmain(void){intnum=0;intdig=-1;//初始化-1便于发现错误printf("Enteranumber:");scanf("%d",&num);if(num<0){//题⽬并没有说如果输⼊是负数或五位数会怎么样，所以不更多考虑了}elseif(num<10){dig=1;}elseif(num<100){dig=2;}elseif(num<1000){dig=3;}elseif(num<10000){dig=4;}printf("Thenumber%dhas%ddigits",num,dig);return0;}ps：加个if即可判断输⼊是否合法，懒得加了5.2#include<stdio.h>intmain(void){inthour,hour1,min;printf("Entera24-hourtime:");scanf("%d:%d",&hour,&min);printf("Equivalent12-hourtime:");if(hour>12){hour1=hour-12;printf("%d:%.2d",hour1,min);}else{printf("%d:%.2d",hour,min);}switch(hour){case0:case1:case2:case3:case4:case5:case6:case7:case8:case9:case10:case11:case12:printf("AM");break;default:printf("PM");break;}return0;}ps：这题感觉写⿇烦了，所以附上官⽅版5.3#include<stdio.h>intmain(void){intnum;floatprice,value,commission1,commission2;printf("输⼊购股数量：");scanf("%d",&num);printf("输⼊每股单价：");scanf("%f",&price);value=num*price;//⾃⼰if(value<2500.0f){commission1=30.0f+0.017f*value;}elseif(value<6250.0f){commission1=56.0f+0.0066f*value;}elseif(value<20000.0f){commission1=76.0f+0.0034f*value;}elseif(value<50000.0f){commission1=100.0f+0.0022f*value;}elseif(value<500000.0f){commission1=155.0f+0.0011f*value;}else{commission1=255.0f+0.0009f*value;}if(commission1<39)commission1=39;//竞争对⼿if(num<2000){commission2=33.03f*num;}else{commission2=33.02f*num;}printf("你的佣⾦是:$%.2f,竞争对⼿的佣⾦是:$%.2f",commission1,commission2);return0;}5.4#include<stdio.h>intmain(void){intspeed;printf("Inputthespeed:");scanf("%d",&speed);printf("GRADE:");if(speed<1){printf("Clam");}elseif(speed<=3){printf("Lightair");}elseif(speed<=27){printf("Breeze");}elseif(speed<=47){printf("Gale");}elseif(speed<=63){printf("Storm");}elseprintf("Hurricane");return0;}5.5#include<stdio.h>intmain(void){floatincome,tax;printf("Entertheincomevalue:");scanf("%f",&income);if(income<750.0f){tax=income*0.01;}elseif(income<2250.0f){tax=7.5f+(income-750.0f)*0.02;}elseif(income<3750.0f){tax=37.5f+(income-2250.0f)*0.03;}elseif(income<5250.0f){tax=82.5f+(income-3750.0f)*0.04;}elseif(income<7000.0f){tax=142.5f+(income-5250.0f)*0.05;}elsetax=230.0f+(income-7000.0f)*0.06;printf("Thetaxtobepaidis%.4f",tax);return0;}5.6#include<stdio.h>intmain(void){intd,i1,i2,i3,i4,i5,j1,j2,j3,j4,j5,c;intfirst_sum,second_sum,total;intcheck;printf("Enterthe12digitsofaUPC:");scanf("%1d%1d%1d%1d%1d%1d%1d%1d%1d%1d%1d%1d",&d,&i1,&i2,&i3,&i4,&i5,&j1,&j2,&j3,&j4,&j5,&c);first_sum=d+i2+i4+j1+j3+j5;second_sum=i1+i3+i5+j2+j4;total=3*first_sum+second_sum;check=9-((total-1)%10);if(check==c)printf("VALID");elseprintf("NOTVALID");return0;}5.7#include<stdio.h>intmain(void){inta,b,c,d;intmin1,min2,max1,max2;printf("Enterfourintegers:");scanf("%d%d%d%d",&a,&b,&c,&d);if(a<b){min1=a;max1=b;}else{min1=b;max1=a;}if(c<d){min2=c;max2=d;}else{min2=d;max2=c;}if(min1>min2)min1=min2;if(max1<max2)max1=max2;printf("Largest:%d\n",max1);printf("Smallest:%d",min1);return0;}5.8#include<stdio.h>intmain(void){inthours,minutes;inttime;printf("Entera24-hourtime:");scanf("%d:%d",&hours,&minutes);time=hours*60+minutes;//48058367976784094511401305这是⼏个起飞时间换算为分钟的结果if(time<480){printf("Closestdeparturetimeis8:00a.m.,arrivingat10:16a.m.");}elseif(time<583){if((time-480)<(583-time))printf("Closestdeparturetimeis8:00a.m.,arrivingat10:16a.m.");elseprintf("Closestdeparturetimeis9:43a.m.,arrivingat11:52a.m.");}elseif(time<679){if((time-583)<(679-time))printf("Closestdeparturetimeis9:43a.m.,arrivingat11:52a.m.");elseprintf("Closestdeparturetimeis11:19a.m.,arrivingat1:31p.m");}elseif(time<767){if((time-679)<(767-time))printf("Closestdeparturetimeis11:19a.m.,arrivingat1:31p.m.");elseprintf("Closestdeparturetimeis12:47a.m.,arrivingat3:00p.m");}elseif(time<840){if((time-767)<(840-time))printf("Closestdeparturetimeis12:47a.m.,arrivingat3:00p.m.");elseprintf("Closestdeparturetimeis2:00p.m.,arrivingat4:08p.m.");}elseif(time<945){if((time-840)<(945-time))printf("Closestdeparturetimeis2:00p.m.,arrivingat4:08p.m.");elseprintf("Closestdeparturetimeis3:45p.m.,arrivingat5:55p.m.");}elseif(time<1140){if((time-945)<(1140-time))printf("Closestdeparturetimeis3:45p.m.,arrivingat5:55p.m.");elseprintf("Closestdeparturetimeis7:00p.m.,arrivingat9:20p.m.");}else{if((time-1140)<(1305-time))printf("Closestdeparturetimeis7:00p.m.,arrivingat9:20p.m.");elseprintf("Closestdeparturetimeis9:45p.m.,arrivingat11:58p.m.");}return0;}5.9#include<stdio.h>//根据题⽬，这道题输⼊的年份需要在同⼀个世纪，否则会出错intmain(void){intday1,month1,year1;intday2,month2,year2;printf("Enterfirstdate(mm/dd/yy):");scanf("%d/%d/%d",&month1,&day1,&year1);printf("Enterseconddate(mm/dd/yy):");scanf("%d/%d/%d",&month2,&day2,&year2);if(year1<year2){printf("%d/%d/%.2disearlierthan%d/%d/%.2d",month1,day1,year1,month2,day2,year2);}elseif(year1==year2){if(month1<month2){printf("%d/%d/%.2disearlierthan%d/%d/%.2d",month1,day1,year1,month2,day2,year2);}elseif(month1==month2){if(day1<day2){printf("%d/%d/%.2disearlierthan%d/%d/%.2d",month1,day1,year1,month2,day2,year2);}elseif(day1==day2){printf("%d/%d/%.2disequalthan%d/%d/%.2d",month1,day1,year1,month2,day2,year2);}else{printf("%d/%d/%.2disearlierthan%d/%d/%.2d",month2,day2,year2,month1,day1,year1);}}else{printf("%d/%d/%.2disearlierthan%d/%d/%.2d",month2,day2,year2,month1,day1,year1);}}else{printf("%d/%d/%.2disearlierthan%d/%d/%.2d",month2,day2,year2,month1,day1,year1);}return0;}5.10以下两道题就加⼊了输⼊数据是否合法的判断#include<stdio.h>intmain(void){intnum;printf("Enternumericalgrade:");scanf("%d",&num);if(num<0||num>100){printf("Illegalinput!");return0;}switch(num/10){case10:case9:printf("Lsttergrade:A");break;case8:printf("Lsttergrade:B");break;case7:printf("Lsttergrade:C");break;case6:printf("Lsttergrade:D");break;default:printf("Lsttergrade:F");break;}return0;}5.11#include<stdio.h>intmain(void){intnum;printf("Enteratwo-digitnumber:");scanf("%d",&num);if(num<10||num>99){printf("Illegalinput!");return0;}printf("Youenteredthenumber");switch(num/10){case9:printf("ninety");break;case8:printf("eighty");break;case7:printf("seventy");printf("seventy");break;case6:printf("sixty");break;case5:printf("fifty");brea