C语言大作业——学生成绩管理系统v2.0

哈尔滨工业大学出版社 课后题大作业V2.0

//成绩管理系统v2.0

#include <stdio.h>

#include <stdlib.h>

#define N 30

void Input (long num[],int score[],int n);

void Totalave (int score[],int n);

void Scoredes (long num[],int score[],int n,int (*compare)(int a,int b));

int Ascending (int a,int b);

void Numas (long num[],int score[],int n);

void Search (long num[],int score[],int n,int x);

void statistis (long num[],int score[],int n);

void List (long num[],int score[],int n);

int main()

{

int n,score[N],c,x,i;

long num[N];

printf("输入学生人数");

scanf("%d",&n);

printf("1.Input record\n");

printf("2.Caculate totel and average score of course\n");

printf("3.Sort in descending order by score\n");

printf("4.Sort in ascending order by number\n");

printf("5.Search by number\n");

printf("6.Statistic analysis\n");

printf("7.List record\n");

printf("0.Exit\n");

printf("Please enter your choice:\n");

printf("\n");

for(;;)

{

scanf("%d",&c);

switch(c)

{

case 1:

Input (num,score,n);

printf("Please enter your choice:\n");

break;

case 2:

Totalave (score,n);

printf("Please enter your choice:\n");

break;

case 3:

Scoredes (num,score,n,Ascending);

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

哈尔滨工业大学出版社 课后题大作业V2.0

printf("ID:%10ld,score:%d\n",num[i],score[i]);//以长整形打印用%ld printf("Please enter your choice:\n");

break;

case 4:

Numas (num,score,n);

printf("Please enter your choice:\n");

break;

case 5:

printf("请输入查找学号\n");

scanf("%d",&x);

Search (num,score,n,x);

printf("Please enter your choice:\n");

break;

case 6:

statistis (num,score,n);

printf("Please enter your choice:\n");

break;

case 7:

List (num,score,n);

Totalave (score,n);

printf("Please enter your choice:\n");

break;

case 0:

exit(0);

}

}

return 0;

}

void Input (long num[],int score[],int n)

{

int i;

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

{

printf("Input student's ID and score");

scanf("%ld%d",&num[i],&score[i]);

}

}

void Totalave (int score[],int n)

{

int i,sum=0;

double ave;

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

sum=sum+score[i];

ave=(double)sum/n;

哈尔滨工业大学出版社 课后题大作业V2.0

printf("Caculate total=%d,average score of course=%f\n",sum,ave); }

void Scoredes (long num[],int score[],int n,int(*compare)(int a,int b)) {

int i,j,k,t,h;

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

{

k=i;

for(j=i+1;j<n;j++)

{

if ((*compare)(score[j],score[k]))

k=j;

}

if(i!=k)

{

t=score[k],h=num[k];

score[k]=score[i],num[k]=num[i];

score[i]=t,num[i]=h;

}

}

}

int Ascending (int a,int b)

{

return a<b;

}

void Numas (long num[],int score[],int n)

{

int i,j,k,t,h;

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

{

k=i;

for(j=i+1;j<n;j++)

{

if (num[j]<num[k])

k=j;

}

if(i!=k)

{

t=score[k],h=num[k];

score[k]=score[i],num[k]=num[i];

score[i]=t,num[i]=h;

}

}

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

哈尔滨工业大学出版社 课后题大作业V2.0

printf("ID:%10ld,score:%d\n",num[i],score[i]);//以长整形打印用%ld }

void Search (long num[],int score[],int n,int x)

{

int high=n-1,low=0,mid,c=0,pos,find=0,i,j,k,t,h;

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

{

k=i;

for(j=i+1;j<n;j++)

{

if (num[j]<num[k])

k=j;

}

if(i!=k)

{

t=score[k],h=num[k];

score[k]=score[i],num[k]=num[i];

score[i]=t,num[i]=h;

}

}

while(find==0&&low<=high)

{

mid=(high+low)/2;

if(x>num[mid])

low=mid+1;

else if(x<num[mid])

high=mid-1;

else

{

pos=mid;

find=1;

}

}

if(find==0)

printf("not find\n");

else

{

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

{

if(score[i]>score[pos])

c++;

}

printf("ID:%10ld，order:%d,score:%d\n",num[pos],c+1,score[pos]); }

哈尔滨工业大学出版社 课后题大作业V2.0

}

void statistis (long num[],int score[],int n) {

int a=0,b=0,c=0,d=0,e=0,i;

double A,B,C,D,E;

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

{

if(score[i]>=90)

a++;

else if(score[i]>=80)

b++;

else if(score[i]>=70)

c++;

else if(score[i]>=60)

d++;

else

e++;

}

A=(double)a/n*100;

B=(double)b/n*100;

C=(double)c/n*100;

D=(double)d/n*100;

E=(double)e/n*100;

printf("优秀人数%d,百分比:%f%%\n",a,A); printf("良好人数%d,百分比:%f%%\n",b,B); printf("中等人数%d,百分比:%f%%\n",c,C); printf("及格人数%d,百分比:%f%%\n",d,D); printf("不及格人数%d,百分比:%f%%\n",e,E); }

void List (long num[],int score[],int n)

{

int i;

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

{

printf("ID:%10ld,score:%d\n",num[i],score[i]); }

}