习题9答案一、程序阅读题1．B 2. C 3. D 4. C二、编程题1．#include<stdio.h>#define M 10struct student{int stu_id;char stu_name[8];struct date{int year;int month;}birthday;float stu_course[3];float stu_avg;};void main(){int i;struct student p[M];for(i=0;i<M;i++){/*读入M个学生的各个数据项*/printf("input student%d'id，student%d'name，student%d'year,month，student%d'scores of math,english,C program:\n",i+1,i+1,i+1,i+1);scanf("%d%s%d%d%f%f%f",&p[i].stu_id,&p[i].stu_name,&p[i].birthday.year,&p[i].birthday.m onth,&p[i].stu_course[0],&p[i].stu_course[1],&p[i].stu_course[2]);}for(i=0;i<M;i++){/*计算某第i个学生的门课的平均成绩并将其输出*/p[i].stu_avg=(p[i].stu_course[0]+p[i].stu_course[1]+p[i].stu_course[2])/3;printf("学号:%d,姓名:%s 出生年月:%d/%d ,数学:%3.0f, 英语:%3.0f,C程序:%3.0f, 平均成绩:%3.0f\n ,p[i].stu_id,p[i].stu_name,p[i].birthday.year,p[i].birthday.month,p[i].stu_course [0],p[i].stu_course[1],p[i].stu_course[2],p[i].stu_avg);}}2．#define M 1000#include<stdio.h>struct worker{char name[12];float salary;float bonus;float deduction;float income;};void main(){int n;scanf("%d",&n);struct worker staff[M],*pwork;int i;for(i=0;i<n;i++){ pwork=&staff[i];printf("please input workers's name,salary,bonus,deduction:\n");scanf("%s%f%f%f",&pwork->name,&pwork->salary,&pwork->bonus,&pwork->deduction);pwork->salary=1.05*(pwork->salary);pwork->income=pwork->salary+pwork->bonus-pwork->deduction;}for(i=0;i<n;i++){ pwork=&staff[i];printf("姓名新的工资奖金扣款实发工资\n");printf("%s %f %f %f %f\n",pwork->name,pwork->salary,pwork->bonus,pwork->deduction, pwork->income);}}3．#include<stdio.h>int main(){ char op;double a1,a2,b1,b2;int number;number=2;//run the program for third timedo{ printf("please input a1,a2,b1,b2 and opteration \n");scanf("%lf,%lf,%c,%lf,%lf",&a1,&a2,&op,&b1,&b2);switch(op){ case'+':printf("(%lf+%lfi)+(%lf+%lfi)=%lf+%lfi",a1,a2,b1,b2,a1+b1,a2+b2);printf("\n");break;case'-':printf("(%lf+%lfi)-(%lf+%lfi)=%lf+%lfi",a1,a2,b1,b2,a1-b1,a2-b2);printf("\n");break;case'*':printf("(%lf+%lfi)*(%lf+%lfi)=%lf+%lfi",a1,a2,b1,b2,a1*b1-a2*b2,a1*b2+a2*b1);printf("\n");break;default:printf("error\n");}}while(number--);return 0;}4．#include"stdio.h"struct Candidate//define the Candidate'struct{ int Id;char Name[6] ;int Ballot_Num;};//define the global variable and initaliz the four candidatesstruct Candidate Total[4]={{1,"wang",0},{2,"liu",0},{3,"li",0},{4,"zhou",0}};//function for display the Candidates' namesvoid PrintName(char a[]){char *p;p=a;while((*p >= 'a' && *p <='z')||(*p >='A' && *p <='Z')){ printf("%c",*p);p++;}}//function for display the Candidates' inforamtionvoid print_Candi_inf(Candidate Total[]){printf("Can_ID ,Can_name ,Ballot_Num\n");int j;for(j=0;j<4;j++){printf("***********************\n");printf("%d",Total[j].Id);printf(" ");PrintName(Total[j].Name);printf(" ");printf("%d",Total[j].Ballot_Num);printf("\n");}}// function for count the candidate's ballotvoid Vote(int t){ int i;for(i=0;i<4;i++)if(Total[i].Id==t){ Total[i].Ballot_Num++;break;}}//function for display the user interfacevoid Display(){printf("please choose the Can_ID on the screen!\n"); printf("1\n");printf("2\n");printf("3\n");printf("4\n");}main(void){int number,temp;printf("Candidates information display as follow \n");// Initializ_inf(Total);print_Candi_inf(Total);Display();number=20;//which is used as the total ballot numberdo{ scanf("%d",&temp);switch(temp){ case 1:Vote(1);print_Candi_inf(Total);break;case 2:Vote(2);print_Candi_inf(Total);break;case 3:Vote(3);print_Candi_inf(Total);break;case 4:Vote(4);print_Candi_inf(Total);break;default:printf("the illegal number,please select again\n");break;}}while(--number>0);return 0;}。
