C语言程序设计 (江宝钏 著) 清华大学出版社 第9章习题答案

习题9答案第5题：#include<stdio.h>voidinfoinput(structstudent*st,intnum);voidlevelcount(structstudent*st,intnum);//定义一个结构student表示学生基本情况structstudent{charstuno[20];charstuname[20];doublecgrade;chargradelevel;};intmain(){structstudentss[100];//根据题意，一个班学生人数不超过100个intsnum=0;while(snum<=0||snum>100){printf("请输入班级的学生数n<=100:");scanf("%d",&snum);}infoinput(ss,snum);levelcount(ss,snum);return0;}//输入基本数据voidinfoinput(structstudent*st,intnum){inti=0;while(i<num){printf("请输入学生%1d的学号、姓名、计算机成绩:",i+1);scanf("%s%s%lf",st[i].stuno,st[i].stuname,&st[i].cgrade);while(st[i].cgrade<0||st[i].cgrade>100){printf("请输入学生%1d的计算机成绩[0-100]:",i+1);scanf("%lf",&st[i].cgrade);}if(st[i].cgrade>=90)st[i].gradelevel='A';elseif(st[i].cgrade>=70)st[i].gradelevel='B';elseif(st[i].cgrade>=60)st[i].gradelevel='C';elsest[i].gradelevel='D';i++;}}//统计等级人数voidlevelcount(structstudent*st,intnum){intlevelA=0,levelB=0,levelC=0,levelD=0;inti;for(i=0;i<num;i++){switch(st[i].gradelevel){case'A':levelA++;break;case'B':levelB++;break;case'C':levelC++;break;case'D':levelD++;break;};}printf("统计结果：A:%d人，B:%d人，C:%d人，D:%d人\n",levelA,levelB,levelC,levelD);}第6题：#include<stdio.h>#include<string.h>voidfinit();voidfcreat();voidfdelete();voidfupdate();voidffind();//定义日期structdate{intyear;intmonth;intday;};//定义一个结构student表示学生基本情况structllist{charname[20];structdatebirthday;charhomeno[10];charmobileno[20];};structllistaddlist[50];//如果不用链表做，假设：//通讯录每个位置记录一个联系人信息//如果某位置联系人姓名信息为空，表示该位置无联系人intmain(){intmenuno=0;while(1){printf("\n请选择操作功能:\n");printf("[1]新建:\n");printf("[2]删除:\n");printf("[3]修改:\n");printf("[4]查询:\n");printf("[5]退出:\n");scanf("%d",&menuno);switch(menuno){case1:fcreat();break;case2:fdelete();break;case3:fupdate();break;case4:ffind();break;case5:return0;default:printf("错误选项，请重新选择!\n");};}return0;}voidfinit(){inti;for(i=0;i<50;i++){strcpy(addlist[i].name,"");addlist[i].birthday.year=0;addlist[i].birthday.month=0;addlist[i].birthday.day=0;strcpy(addlist[i].homeno,"");strcpy(addlist[i].mobileno,"");}}voidfcreat(){inti;charoname[20];intoyear;intomonth;intoday;charohomeno[10];charomobileno[20];printf("请输入联系人信息姓名、出生年、月、日、家庭电话、手机号:\n");scanf("%s%d%d%d%s%s",oname,&oyear,&omonth,&oday,ohomeno,omobileno);for(i=0;i<50;i++){if(strlen(addlist[i].name)==0){strcpy(addlist[i].name,oname);addlist[i].birthday.year=oyear;addlist[i].birthday.month=omonth;addlist[i].birthday.day=oday;strcpy(addlist[i].homeno,ohomeno);strcpy(addlist[i].mobileno,omobileno);printf("已增加新联系人\n");break;}}if(i>=50)printf("通讯录满，无法增加新联系人\n");}voidfdelete(){inti;charoname[20];printf("请输入联系人姓名:\n");scanf("%s",oname);for(i=0;i<50;i++){if(strcmp(addlist[i].name,oname)==0){strcpy(addlist[i].name,"");addlist[i].birthday.year=0;addlist[i].birthday.month=0;addlist[i].birthday.day=0;strcpy(addlist[i].homeno,"");strcpy(addlist[i].mobileno,"");printf("已删除该联系人%s\n",oname);break;}}if(i>=50)printf("无该联系人，无法删除\n");}voidfupdate(){inti;charoname[20];charnname[20];intnyear;intnmonth;intnday;charnhomeno[10];charnmobileno[20];printf("请输入联系人姓名:\n");scanf("%s",oname);printf("请输入联系人信息姓名、出生年、月、日、家庭电话、手机号:\n");scanf("%s%d%d%d%s%s",nname,&nyear,&nmonth,&nday,nhomeno,nmobileno);for(i=0;i<50;i++){if(strcmp(addlist[i].name,oname)==0){strcpy(addlist[i].name,nname);addlist[i].birthday.year=nyear;addlist[i].birthday.month=nmonth;addlist[i].birthday.day=nday;strcpy(addlist[i].homeno,nhomeno);strcpy(addlist[i].mobileno,nmobileno);printf("已修改联系人%s\n",nname);break;}}if(i>=50)printf("无该联系人，无法修改\n");}voidffind(){inti;charoname[20];printf("请输入联系人姓名:\n");scanf("%s",oname);for(i=0;i<50;i++){if(strcmp(addlist[i].name,oname)==0){printf("姓名:%s",addlist[i].name);printf("出生日期:%1d年%1d月%1d日",addlist[i].birthday.year,addlist[i].birthday.month,addlist[i].birthday.day);printf("家庭电话:%s",addlist[i].homeno);printf("手机:%s",addlist[i].mobileno);break;}}if(i>=50)printf("无该联系人\n");}第7题：#include<stdio.h>voidsalaryinput(structsalary*sl,intnum);voidsalarylist(structsalary*sl,intnum);structsalary{charid[20];charname[20];doublebase;doublemerit;doublesubsidiary;doubleinsurance;doubletax;doublereal;};intmain(){structsalaryss[100];//工资人数不超过100个intsnum=0;while(snum<=0||snum>100){printf("请输员工人数n<=100:");scanf("%d",&snum);}salaryinput(ss,snum);salarylist(ss,snum);return0;}voidsalaryinput(structsalary*sl,intnum){inti=0;while(i<num){printf("请输入员工%1d的编号、姓名、基本工资、绩效工资、津贴工资、保险:\n",i+1);scanf("%s%s%lf%lf%lf%lf",sl[i].id,sl[i].name,&sl[i].base,&sl[i].merit,&sl[i].subsidiary,&sl[i].insurance);sl[i].tax=(sl[i].base+sl[i].merit+sl[i].subsidiary)*0.05;sl[i].real=(sl[i].base+sl[i].merit+sl[i].subsidiary-sl[i].insurance-sl[i].tax);i++;}}voidsalarylist(structsalary*sl,intnum){inti;for(i=0;i<num;i++){printf("员工的编号、姓名、实发工资如下:",i+1);printf("%s%s%lf\n",sl[i].id,sl[i].name,sl[i].real);}}第8题：#include<stdio.h>#include<stdlib.h>voidlinkcreat();voidlinklist();structNode{chardata;structNode*link;};Node*snode=NULL,*tmpnode,*lastnode;intmain(){linkcreat();linklist();//最好增加一个释放链表的函数，为什么？return0;}voidlinkcreat(){charc;lastnode=snode;printf("请输入一行字符:\n");while(scanf("%c",&c),c!=