c君带你玩编程答案(c君带你玩编程答案知到)

20分求c语言编程题答案

我这里有一些程序(dev-c++编译器)，虽然并不是你所想要的完美答案，但是其中的一些代码，希望对你有所帮助：

No.1有5个学生，每个学生有3门课的成绩，从键盘输入数据（包括学生号，姓名，3门课的成绩），计算出平均成绩，将原有数据和计算出的平均分数存放在磁盘文件stud中。

#include

structstudent

charnum[10];

charname[8];

intscore[3];

floatave;

}stu[5];

intmain()

inti,j,sum;

FILE*fp;

for(i=0;i<5;i++)

printf("\ninputscoreofstudent%d:\n",i+1);

printf("No.:");

scanf("%s",stu[i].num);

printf("name:");

scanf("%s",stu[i].name);

sum=0;

for(j=0;j<3;j++)

printf("score%d:",j+1);

scanf("%d",&stu[i].score[j]);

sum+=stu[i].score[j];

stu[i].ave=sum/3.0;

fp=fopen("stud","w");

for(i=0;i<5;i++)

if(fwrite(&stu[i],SIzeof(structstudent),1,fp)!=1)

printf("filewriteerror\n");

fclose(fp);

fp=fopen("stud","r");

for(i=0;i<5;i++)

fread(&stu[i],sizeof(structstudent),1,fp);

printf("\n%s,%s,%d,%d,%d,%6.2f\n",stu[i].num,stu[i].name,

stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].ave);

system("pause");

return0;

No.2将运行No.1程序所得到的stud文件中的学生数据按平均分进行排序处理，将已排序的学生数据存入一个新文件stu_sort中。

#include

#defineN10

structstudent

charnum[10];

charname[8];

intscore[3];

floatave;

}st[N],temp;

intmain()

FILE*fp;

inti,j,n;

if((fp=fopen("stud","r"))==NULL)

printf("cannotopen.");

exit(0);

printf("Filestud:");

for(i=0;fread(&st[i],sizeof(structstudent),1,fp)!=0;i++)

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[i].ave);

printf("\n");

fclose(fp);

for(i=0;i

for(j=i+1;j

if(st[i].ave

temp=st[i];

st[i]=st[j];

st[j]=temp;

printf("\nNow:");

fp=fopen("stu_sort","w");

for(i=0;i

fwrite(&st[i],sizeof(structstudent),1,fp);

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[i].ave);

printf("\n");

fclose(fp);

system("pause");

return0;

No.3将题No.2已排序的学生成绩文件进行插入处理。插入一个学生的3门课程成绩，程序先计算新插入学生的平均成绩，然后将它按平均成绩高低顺序插入，插入后建立一个新文件。

#include

structstudent

charnum[10];

charname[8];

intscore[3];

floatave;

}st[10],s;

intmain()

FILE*fp,*fp1;

inti,j,t,n;

printf("\nNo.:");

scanf("%s",s.num);

printf("name:");

scanf("%s",s.name);

printf("score1,score2,score3:");

scanf("%d,%d,%d",&s.score[0],&s.score[1],&s.score[2]);

s.ave=(s.score[0]+s.score[1]+s.score[2])/3.0;

if((fp=fopen("stu_sort","r"))==NULL)

printf("cannotopenfile.");

exit(0);

printf("Originaldata:\n");

for(i=0;fread(&st[i],sizeof(structstudent),1,fp)!=0;i++)

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[i].ave);

for(t=0;st[t].ave>s.ave&&t

printf("\nNow:\n");

fp1=fopen("sort1.dat","w");

for(i=0;i

fwrite(&st[i],sizeof(structstudent),1,fp1);

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[t].ave);

fwrite(&s,sizeof(structstudent),1,fp1);

printf("\n%8s%8s%8d%8d%8d%10.2f",s.num,s.name,s.score[0],

s.score[1],s.score[2],s.ave);

for(i=t;i

fwrite(&st[i],sizeof(structstudent),1,fp1);

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[i].ave);

printf("\n");

fclose(fp);

fclose(fp1);

system("pause");

return0;

No.4将No.3的结果仍存入原有的文件而不另建立新文件。

#include

structstudent

charnum[10];

charname[8];

intscore[3];

floatave;

}st[10],s;

intmain()

FILE*fp;

inti,j,t,n;

printf("\nNo.:");

scanf("%s",s.num);

printf("name:");

scanf("%s",s.name);

printf("score1,score2,score3:");

scanf("%d,%d,%d",&s.score[0],&s.score[1],&s.score[2]);

s.ave=(s.score[0]+s.score[1]+s.score[2])/3.0;

if((fp=fopen("stu_sort","r"))==NULL)

printf("cannotopenfile.");

exit(0);

printf("Originaldata:\n");

for(i=0;fread(&st[i],sizeof(structstudent),1,fp)!=0;i++)

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[i].ave);

for(t=0;st[t].ave>s.ave&&t

printf("\nNow:\n");

fp=fopen("stu_sort","w");

for(i=0;i

fwrite(&st[i],sizeof(structstudent),1,fp);

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[t].ave);

fwrite(&s,sizeof(structstudent),1,fp);

printf("\n%8s%8s%8d%8d%8d%10.2f",s.num,s.name,s.score[0],

s.score[1],s.score[2],s.ave);

for(i=t;i

fwrite(&st[i],sizeof(structstudent),1,fp);

printf("\n%8s%8s",st[i].num,st[i].name);

for(j=0;j<3;j++)

printf("%8d",st[i].score[j]);

printf("%10.2f",st[i].ave);

printf("\n");

fclose(fp);

system("pause");

return0;

对链表的综合操作：

#include

#defineLENsizeof(structstudent)

structstudent

longnum;

floatscore;

structstudent*next;

intn;

structstudent*creat(void)

structstudent*head;

structstudent*p1,*p2;

p1=p2=(structstudent*)malloc(LEN);

scanf("%ld,%f",&p1->num,&p1->score);

head=NULL;

while(p1->num!=0)

n=n+1;

if(n==1)head=p1;

elsep2->next=p1;

p2=p1;

p1=(structstudent*)malloc(LEN);

scanf("%ld,%f",&p1->num,&p1->score);

p2->next=NULL;

return(head);

voidprint(structstudent*head)

structstudent*p;

printf("\nNow,These%drecordsare:\n",n);

p=head;

if(head!=NULL)

printf("%ld%5.1f\n",p->num,p->score);

p=p->next;

}while(p!=NULL);

structstudent*del(structstudent*head,longnum)

structstudent*p1,*p2;

if(head==NULL)

printf("\nlistnull!\n");

return(head);

p1=head;

while(num!=p1->num&&p1->next!=NULL)

p2=p1;p1=p1->next;

if(num==p1->num)

if(p1==head)head=p1->next;

elsep2->next=p1->next;

printf("delete:%ld\n",num);

n=n-1;

elseprintf("%ldnotbeenfound!\n",num);

return(head);

structstudent*insert(structstudent*head,structstudent*stud)

structstudent*p0,*p1,*p2;

p1=head;

p0=stud;

if(head==NULL)

head=p0;

p0->next=NULL;

while((p0->num>p1->num)&&(p1->next!=NULL))

p2=p1;

p1=p1->next;

if(p0->num<=p1->num)

if(head==p1)head=p0;

p2->next=p0;

p0->next=p1;

p1->next=p0;

p0->next=NULL;

n=n+1;

return(head);

intmain()

structstudent*head,*stu;

longdel_num;

printf("inputrecords:\n");

head=creat();

print(head);

printf("\ninputthedeletednumber:");

scanf("%ld",&del_num);

while(del_num!=0)

head=del(head,del_num);

print(head);

printf("\ninputthedeletednumber:");

scanf("%ld",&del_num);

printf("\ninputtheinsertedrecord:");

stu=(structstudent*)malloc(LEN);

scanf("%ld,%f",&stu->num,&stu->score);

while(stu->num!=0)

head=insert(head,stu);

print(head);

printf("\ninputtheinsertedrecord:");

stu=(structstudent*)malloc(LEN);

scanf("%ld,%f",&stu->num,&stu->score);

system("pause");

return0;

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求一道C语言编程题答案

#includemain(){int n,a,b,c,num=0;float sum=0;printf("输入每件衣服的价格和三位顾客各买多少件衣服,以空格隔开：");scanf("%d%d%d%d",&n,&a,&b,&c);if(a<=20)if(b>20&&b<=50)if(c>50){sum=a*n+b*n*0.8+c*n*0.5;num=a+b+c;printf("售出%d衣服.\n共%.2f钱.\n",num,sum);}else printf("输入错误");}