你贴的第二图里只是read_line()函数的声明,要调用一个函数必须有实现体啊.就是所谓的定义.
所以你必须写出read_line()函数实现体啊.
前段时间学链表做的，刚为你改好代码，记住！！！！——GCC编译通过，其他编译器可能编译错误误！！！！！！！！！！！！！#include <ctype.h>
#include<stdio.h>
#ifndef READLINE_H
#define READLINE_H
int read_line(char str[],int n)
#endif
int read_line(char str[],int n)
{
int ch,i=0
while(isspace(ch=getchar()))
while(ch!='\n' &&ch !=EOF)
{
if(i<n)
str[i++]=ch
printf("%c",ch)
ch=getchar()}
str[i]='\0'
return i
}
#include <stdio.h>
#include <stdlib.h>
#define NAME_LEN 25
struct part{
int bianhao
char name[26]
int jiage
int shuliang
struct part*next}
struct part *inventory=NULL
struct part *find_part(int number)
{
struct part *p
for(p=inventory
p!=NULL &&number>p->bianhaop=p->next)
if(p != NULL &&number==p->bianhao)
return p
return NULL
}
void insert(void)
{
struct part *cur, *prev, *new_node
new_node=malloc(sizeof(struct part))
if(new_node==NULL)
{
printf("fullcant\n")
return}
printf("请输入商品编号:\n")
scanf("%d",&new_node->bianhao)
for(cur=inventory,prev=NULLcur!=NULL &&new_node->bianhao>cur->bianhaoprev=cur,cur=cur->next)
if(cur!=NULL &&new_node->bianhao==cur->bianhao)
{
printf("part already exists.\n")
free(new_node)
return}
printf("\n请输入商品名称:")
read_line(new_node->name,NAME_LEN)
printf("\n请输入价格：")
scanf("%d",&new_node->jiage)
printf("\n请输入数量：")
scanf("%d",&new_node->shuliang)
new_node->next=cur
if(prev==NULL)
inventory=new_node
else
prev->next=new_node}
void search(void)
{
int number,z,y
struct part *p
printf("请输入编号号: ")
scanf("%d",&number)
p=find_part(number)
if(p!=NULL)
{
printf(":编号%d\n",p->bianhao)
printf("名称: %s\n",p->name)
printf("价格: %d\n",p->jiage)
printf("数量:%d\n",p->shuliang)
printf("确定销售此产品？y ?是就输入1")
scanf("%d",&y)
if(y==1){
printf("请输入出售数量")
scanf("%d",&z)
p->shuliang=p->shuliang-z
printf("出售成功")
}
else
printf("取消销售")
}
else
printf("part not found.\n")
}
void update(void)
{
int number,change,kemu
struct part *p
printf("请输入编号:")
scanf("%d",&number)
p=find_part(number)
if(p!=NULL)
{
printf("\n请输入更改的类别数量和价格1或2:")
scanf("%d",&kemu)
printf("\n请输入更改的数量: ")
scanf("%d",&change)
switch(kemu)
{
case 1:p->shuliang=changebreak
case 2:p->jiage=changebreak
}
}
else
printf("part not found .\n")
}
void print(void)
{
struct part *p
printf("part number part name quantity on hand\n")
for(p=inventoryp!=NULLp=p->next)
printf("%8d,%-25s,%8d,%8d\n",p->bianhao,p->name,p->jiage,p->shuliang)
}
int kk(){
struct part *p
char str[30]
printf("请输入文件路径：")
read_line(str,30)
printf("%s",str)
FILE *fp
if((fp=fopen(str,"a+"))==NULL)
{
printf("notttttttt")
exit(0)
}
for(p=inventoryp!=NULL&&!feof(fp)p=p->next)
if((fwrite(p,sizeof(struct part),1,fp))!=1)
{printf("not")
exit(0)
}
/*fseek(fp,,SEEK_CUR)*/
fclose(fp)
}
int bb()
{
struct part *p
char str[25]
printf("请输入文件路径：")
read_line(str,30)
printf("%s",str)
FILE *fp
if((fp=fopen(str,"r+"))==NULL)
{
printf("notttttttt")
exit(0)
}
for(p=inventoryfp!=NULL&&!feof(fp)p=p->next)
{
p=malloc(sizeof(struct part))
fread(p,sizeof(struct
part),1,fp)
printf("%d\n %s \n%d\n %d \n ",p->bianhao,p->name,p->jiage,p->shuliang
)
}
}
int main(void)
{
char code
for()
{
printf("enter operation code: ")
scanf("%c",&code)
while(getchar()!='\n')
switch(code)
{
case 'i' : insert()break//录入商品信息，名称，价格，数量等
case 's' : search()break//搜索商品，显示信息，是否出售，库存数量会减少
case 'u' : update()break//更改商品价格和库存数量
case 'p' : print()break//打印出全部商品信息
case 'k' : kk()break//保存商品信息！
case 'l' : bb()break//读取上次保存的信息（为避免出错，每次运行程序请先读取信息）
case 'q' : return 0//退出
default: printf("Illegal code\n")
}
printf("\n")
}
}
float inventoryfloat areaforestcurretyear
float capitalcurretyear
float totalcapital
float areacutcurretyear
float profitcurretyear
长一点没有问题。
也可以用简写，加一个注释表，
比如：cpt_cur_yr=capitalcurretyear
...
