通过学号查找学生成绩的问题

通过学号查找学生成绩的问题，需要用函数解决，不知道怎么写，可以看看嘛

#include void main()

{int x,k,r;

int xh[50],yy[50],jsj[50],gdsx[50],wl[50];

int i=0;

char yn;

do

{printf("\n======================================================\n");

printf("\n|****欢迎使用成绩管理系统，请选择以下数字进行操作****|\n");

printf("\n|====================================================|\n");

printf("\n|1.录入学生成绩 |\n");

printf("\n|2.显示学生成绩 |\n");

printf("\n|3.查询学生成绩 |\n");

printf("\n|4.修改学生成绩 |\n");

printf("\n|0.退出管理系统 |\n");

printf("\n|====================================================|\n");

printf("\n| 制作人：张杰(车辆-2-1764152228)|");

printf("\n|====================================================|\n");

printf("\n\n");

printf("请选择：");

scanf("%d",&x);

if(x==1)

{printf("您选择了录入学生成绩\n");

do

{printf("学号:");

scanf("%d",&xh[i]);

printf("英语:");

scanf("%d",&yy[i]);

printf("计算机:");

scanf("%d",&jsj[i]);

printf("高等数学:");

scanf("%d",&gdsx[i]);

printf("物理");

scanf("%d",&wl[i]);

i++;

printf("继续录入请按任意键，结束请按*键\n");

fflush(stdin);

scanf("%c",&yn);

}while(yn!='*');

}

if(x==2)

{

printf("您选择了显示学生成绩!\n");

printf("学号 英语 计算机高等数学物理\n");

for(k=0;kprintf("%d\t%d\t%d\t%d\t%d\n",xh[k],yy[k],jsj[k],gdsx[k],wl[k]);

}

if(x==3)

{

printf("您选择了查询学生成绩\n");

printf("请输入需要查询的学号:");

scanf("%d",&xh[r]);

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

if((xh[i])==xh[r])

{

printf("学号 英语 计算机高等数学物理\n");

printf("%d\t%d\t%d\t%d\t%d\n",xh[i],yy[i],jsj[i],gdsx[i],wl[i]);

break;

}

}

if(x==4)

{printf("您选择了修改学生成绩\n");

printf("请输入需要修改的学号:");

}

if(x==0)

printf("您选择了退出管理系统");

}while(x>0);

}

求大神帮我做一下这个按学号查询和按学号修改，我大一会的不多麻烦用最基础的做，谢谢

全部回答

1楼

2019-10-05 09:55

#include"stdio.h"

#include"string.h"

#define n 1000

void menu();

int password();

int dedao();

int uninque(struct student shu[],int len,int xuehao);

void shuchu(struct student shu[],int len);

void send(struct student shu[],int len);

int readfromfile(struct student shu[]);

void chaxun(struct student shu[],int len);

void paixu(struct student shu[],int len);

struct student

{

int num;

char name[10];

int score;

} shu[n];

main()

{ int len=0,key,choice;

do {

key=password();

}while(key==0);

while(1)

{ menu();

printf("请输入选项<1,2,3,4,5,6,7>\n");

scanf("%d",&choice);

switch(choice)

{

case 1:printf("输入信息函数\n"); len=dedao(shu,len); break;

case 2:printf("输出函数被调用\n"); shuchu(shu,len); break;

case 3:printf("保存到文件函数被调用\n"); send(shu,len); break;

case 4:printf("从文件读函数被调用\n"); len=readfromfile( shu); break;

case 5:printf("按学号查询函数被调用\n"); chaxun(shu,len); break;

case 6:printf("按成绩排序函数被调用\n"); paixu(shu,len); break ;

case 7:exit(0);break;

}

}

}

void menu()

{

printf("\n");

printf(" *******************************************\n");

printf(" * 学生成绩管理系统2.0 *\n");

printf(" * 1.输入信息 *\n");

printf(" * 2.输出信息 *\n");

printf(" * 3.保存到文件 *\n");

printf(" * 4.从文件读 *\n");

printf(" * 5.按学号查询 *\n");

printf(" * 6.按成绩排序(由大到小) *\n");

printf(" * 7.程序结束 *\n");

printf(" *******************************************\n");

}

int password()

{

char a[100];

char key[]="asd";

printf("请输入密码\n");

scanf("%s",&a);

if(strcmp(a,key)==0)

return 1;

else

return 0;

}

int dedao(struct student shu[],int len)

{ int i=len;

int flag=0;

int xuehao,bank,chengji;

while(i

{

while(1)

{

printf("学号");

scanf("%d",&xuehao);

if(xuehao==0)

{ flag=1;

break;

}

bank=uninque(shu,i,xuehao);

if(bank==0)

{ shu[i].num=xuehao;

break;}

}

if(flag==1)

break;

printf("姓名");

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

while (1)

{

printf("成绩");

if(scanf("%d",&chengji)==1)

{break;}

printf("输入格式错误，请重新输入！");

while(getchar()!='\n')

continue;

}

while(getchar()!='\n')

continue;

shu[i].score=chengji;

i++;

}

return i;

}

int uninque(struct student shu[],int len,int xuehao)

{ int i;

int bank=0;

for (i=0;i

{

if(xuehao==shu[i].num)

bank=1;

}

return bank;

}

void shuchu(struct student shu[],int len)

{

int i;

printf("%-4s %-10s %-3s","学号","姓名","成绩\n\n");

for(i=0;i

{

printf("%-4d %-10s %-3d",shu[i].num,shu[i].name,shu[i].score);

printf("\n");

}

printf("\n\n");

}

void send(struct student shu[],int len)

{

int i;

file *fp;

fp=fopen("d:\\chegnji.txt","wb");

if(fp==null)

{

printf("打开文件出错！\n");

exit(0);

}

for(i=0;i

fwrite(shu+i,sizeof(struct student),1,fp);

fclose(fp);

}

int readfromfile(struct student shu[])

{

file *fp=null;

int i=0;

fp=fopen("d:\\chegnji.txt","rb");

if(fp!=null)

{

printf("%-4s %-10s %-3s","学号","姓名","成绩\n\n");

while(!feof(fp))

{

if(i>=n)

break;

if(fread(shu+i,sizeof(struct student),1,fp))

printf("%-4d %-10s %-3d",shu[i].num,shu[i].name,shu[i].score);

printf("\n");

i++;

}

fclose(fp);

}

i=i-1;

return i;

}

void chaxun(struct student shu[],int len)

{

int i,nue,b=0;

while(1)

{printf("input the student number (input'0' close) ");

scanf("%d",&nue);

b=0;

if(nue==0)

break;

for (i=0;i

{

if(nue==shu[i].num)

{ printf("%-4s %-10s %-3s","学号","姓名","成绩\n\n");

printf("%-4d %-10s %-3d\n",shu[i].num,shu[i].name,shu[i].score);

b=1;

}

}

if(b==0)

printf("the number is not exist!\n");

}

}

void paixu(struct student shu[],int len)

{

int i,j;

struct student temp;

printf("%-4s %-10s %-3s","学号","姓名","成绩\n\n");

for(i=0;i

{

for(j=i;j

{

if(shu[j].score>shu[i].score)

{

temp=shu[j];

shu[j]=shu[i];

shu[i]=temp;

}

}

printf("%-4d %-10s %-3d\n",shu[i].num,shu[i].name,shu[i].score);

}

}

int SearchbyNum(long num[],int score[],int n,long number)
{
int i,pos=-1;
for(i=0;i<n;i++)
    if(num[i]==number)
    {
    pos=i;
    break;
    }
return pos;
}