不能按照目的执行,错在那儿？
3、建立一个链表，每个结点包括学号、姓名及英语、计算机、数学三门课程的成绩、平均成绩。除平均成绩外，各项均由键盘输入。
要求：
（A）计算平均成绩。
（B）要实现插入功能。
（C）要有排序功能。
（D）要有存取功能。
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
FILE*fp;
struct student
{ char num[10];
char name[20];
int score[3];
float ave;
struct student *next;
};
main()
{ int i,sum=0,a;
char m;
struct student *head,*p,*pr,*temp;
head=NULL;
do
{ printf( "Do you want to input new student 's information?(Y/N)\n ");
scanf( "%c ",&m);
if(m== 'N '||m== 'n ') break;
p=(struct student *)malloc(sizeof(struct student));
if(p==NULL)
{ printf( "No enough memory to alloc!\n ");
exit(0);
}
if(head==NULL)
{ printf( "It 's the first!\n ");
head=p;
p-> next=NULL;
}
else{ pr=head;
for(i=1;pr-> next!=NULL;i++)
pr=pr-> next;
printf( "Now has %d nodes!\n ",i);
do{ printf( "Please input insert node 's number(> 0)!\n ");
scanf( "%d ",&a);
}while(a <=0||a> i+1);
if(a==1)
{ p-> next=head;
head=p;
}
else{ pr=head;
for(i=1;a-1!=i;i++)
pr=pr-> next;
p-> next=pr-> next;
pr-> next=p;
}
}
printf( "Please enter the new student 's information!\n ");
scanf( "%s ",p-> num);
scanf( "%s ",p-> name);
for(i=0;i <3;i++)
{ scanf( "%d ",p-> score[i]);
sum=sum+p-> score[i];
}
p-> ave=sum/3.0;
}while(m== 'Y '||m== 'y ');
printf( "Do you need make order?(Y/N)\n ");
scanf( "%c ",&m);
if(m== 'Y '||m== 'y '){
if(head==NULL)
{ printf( "No information!\n ");
}
for(pr=head;pr-> next!=NULL;pr=pr-> next)
for(p=pr-> next;p-> next!=NULL;p=p-> next)
{ if(pr-> ave <p-> ave)
{ *temp=*pr;
*pr=*p;
*p=*temp;
}
}
if(pr-> next==NULL)
printf( "Make order finish!\n ");
}
printf( "Do you want to write to a file!\n ");
scanf( "%c ",&m);
if(m== 'Y '||m== 'y '){
fp=fopen( "zhan.txt ", "w+ ");
if(fp==NULL)
{ printf( " File open error! ");
exit(0);
}
for(p=head;p-> next!=NULL;p=p-> next)
{ fwrite(p,sizeof(struct student),1,fp);
printf( "%s,%s,%d,%d,%d,%f\n ",p-> num,p-> name,p-> score[0],p-> score[1],p-> score[2],p-> ave);
}
if(!fclose(fp))
printf( "File close OK!\n ");
}
}
[解决办法]
还是用map吧!多简单
[解决办法]
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
FILE*fp;
struct student
{ char num[10];
char name[20];
int score[3];
float ave;
struct student *next;
};
main()
{ int i,sum=0,a;
char m;
struct student *head,*p,*pr,*temp;
head=NULL;
do
{ printf( "Do you want to input new student 's information?(Y/N)\n ");
scanf( "%c ",&m);
if(m== 'N '||m== 'n ') break;
p=(struct student *)malloc(sizeof(struct student));
if(p==NULL)
{ printf( "No enough memory to alloc!\n ");
exit(0);
}
if(head==NULL)
{ printf( "It 's the first!\n ");
head=p;
p-> next=NULL;
}
else{ pr=head;
for(i=1;pr-> next!=NULL;i++)
pr=pr-> next;
printf( "Now has %d nodes!\n ",i);
do{ printf( "Please input insert node 's number(> 0)!\n ");
scanf( "%d ",&a);
}while(a <=0||a> i+1);
if(a==1)
{ p-> next=head;
head=p;
}
else{ pr=head;
for(i=1;a-1!=i;i++)
pr=pr-> next;
p-> next=pr-> next;
pr-> next=p;
}
}
printf( "Please enter the new student 's information!\n ");
scanf( "%s ",p-> num);
scanf( "%s ",p-> name);
for(i=0;i <3;i++)
{ scanf( "%d ",p-> score[i]); //这里改为scanf( "%d ",&p-> score[i]);
sum=sum+p-> score[i];
}
p-> ave=sum/3.0;
}while(m== 'Y '||m== 'y ');
printf( "Do you need make order?(Y/N)\n ");
scanf( "%c ",&m);
if(m== 'Y '||m== 'y '){
if(head==NULL)
{ printf( "No information!\n ");
}
for(pr=head;pr-> next!=NULL;pr=pr-> next)
for(p=pr-> next;p-> next!=NULL;p=p-> next)
{ if(pr-> ave <p-> ave)
{ *temp=*pr;
*pr=*p;
*p=*temp;
}
}
if(pr-> next==NULL)
printf( "Make order finish!\n ");
}
printf( "Do you want to write to a file!\n ");
scanf( "%c ",&m);
if(m== 'Y '||m== 'y '){
fp=fopen( "zhan.txt ", "w+ ");
if(fp==NULL)
{ printf( " File open error! ");
exit(0);
}
for(p=head;p-> next!=NULL;p=p-> next)
{ fwrite(p,sizeof(struct student),1,fp);
printf( "%s,%s,%d,%d,%d,%f\n ",p-> num,p-> name,p-> score[0],p-> score[1],p-> score[2],p-> ave);
}
if(!fclose(fp))
printf( "File close OK!\n ");
}
}
