未定义引用'clrscr'和ld返回1退出状态

Question

我试图编译C代码免费可用。该代码相对于实现链接列表。

但是当我尝试建立并运行代码我得到这个错误两次：

undefined reference to 'clrscr' 

这个错误一次：

error: ld returned 1 exit status 

即时通讯在C和Im一些difficutlties初学者试图解决这个问题，你看到什么是错的？

代码：

#include<conio.h> 
#include<stdio.h> 
#include<stdlib.h> 
void create(); 
void insert_atfirst(); 
void insert_atlast(); 
void insert(); 
void delete_bypos(); 
void delete_byval(); 
void display(); 
int menu(); 
struct node 
{ 
    int data; 
    struct node *next; 
}*first=NULL,*last=NULL,*temp=NULL; 
void main() 
{ 
    int ch; 
    clrscr(); 
    do{ 
     ch=menu(); 

     switch(ch) 
     { 
      case 1:create(); 
       break; 
      case 2:insert_atfirst(); 
       break; 
      case 3:insert_atlast(); 
       break; 
      case 4:insert(); 
       break; 
      case 5:delete_bypos(); 
       break; 
      case 6:delete_byval(); 
       break; 
      case 7:display(); 
       break; 
      case 8:exit(0); 
      case 9:clrscr(); 
      default:printf("\nError-->Enter a valid choice!!"); 
       exit(0); 
     } 
    }while(1); 
} 

void create() 
{ 
    temp=(struct node*)malloc(sizeof(struct node)); 
    printf("\nEnter the Data in the Node:"); 
    scanf("%d",&temp->data); 
    temp->next=NULL; 
    if(first==NULL) 
    { 
     first=temp; 
     last=temp; 
    } 
    else 
    { 
     last->next=temp; 
     last=temp; 
    } 
} 

void insert_atfirst() 
{ 
    temp=(struct node*)malloc(sizeof(struct node)); 
    printf("\nEnter Element:"); 
    scanf("%d",&temp->data); 
    temp->next=first; 
    first=temp; 
} 
void insert() 
{ 
    struct node *t, *t1; 
    int pos, count=1,AB; 
    printf("\nEnter Position to be inserted:"); 
    scanf("%d",&pos); 
    printf("\nAfter[1] or Before[2]:"); 
    scanf("%d",&AB); 
    temp=(struct node*)malloc(sizeof(struct node)); 
    printf("\nEnter data:"); 
    scanf("%d",&temp->data); 
    temp->next=NULL; 
    t=t1=first; 
    while(t!=NULL) 
    { 
     if(pos==count) 
      break; 
     else 
     { 
      t=t1; 
      t=t->next; 
      count++; 
     } 
    } 
    if(AB==1) 
    { 
     temp->next=t->next; 
     t->next=temp; 
    } 
    else if(AB==2) 
    { 
     temp->next=t; 
     t1->next=temp; 
    } 
    else 
     printf("\nInvalid Input"); 
} 

void insert_atlast() 
{ 
    temp=(struct node*)malloc(sizeof(struct node)); 
    printf("\nEnter value to be inserted at last:"); 
    scanf("%d",&temp->data); 
    last->next=temp; 
    last=temp; 
} 

void delete_bypos() 
{ 
    struct node *t,*t1; 
    int pos, count=1; 
    printf("\nEnter the Position of the element you would like to delete:"); 
    scanf("%d",&pos); 
    t=t1=first; 
    while(t!=NULL) 
    { 
     if(pos==count) 
     t1=t; 
     t=t->next; 
     count++; 
    } 
    if(pos==1) 
    { 
     first=t->next; 
     printf("\nExceuted-->First Node is deleted!!"); 
    } 
    else if(t==last) 
    { 
     t1->next=NULL; 
     free(t); 
     printf("\nExecuted-->Last Node is deleted!!"); 
    } 
    else 
    { 
     t1->next=t->next; 
     free(t); 
     printf("\nExecuted-->Node has been deleted!!"); 
    } 
} 

void delete_byval() 
{ 
    int val, count=1; 
    struct node *t,*t1; 
    printf("\nEnter value:"); 
    scanf("%d",&val); 
    t=t1=first; 
    while(t!=NULL) 
    { 
     if(val==t->data) 
     break; 
     else 
     { 
     t=t->next; 
     count++; 
     } 
    } 
    if(t==first) 
    { 
     first=t->next; 
     free(t); 
    } 
    else if(first==last) 
    { 
     t1->next=NULL; 
     free(t); 
     last=t1; 
    } 
    else 
    { 
     t1->next=t->next; 
     free(t); 
    } 
} 
void display() 
{ 
    temp=first; 
    while(temp!=NULL) 
    { 
    printf("|%d|%d| --> ",temp->data,temp->next); 
    temp=temp->next; 
    } 
} 

int menu() 
{ 
    int ch; 
    printf("\n------------"); 
    printf("\nSingle Linked List"); 
    printf("\n------------"); 
    printf("\n1.Create\n2.Insert at first\n3.Insert at last\n4.Insert at Middle\n5.Delete by Position\n6.Delete by Value\n7.Display\n8.Exit"); 
    printf("\n\n-->Enter Your Choice:"); 
    scanf("%d",&ch); 
    return ch; 
} 

Answer 1

clrscr()功能只在Borland的C编译器 - 用Turbo C等。使用system("cls")函数。