1 个未解析的外部文件

#include <stdio.h> 
#include <stdlib.h> 
#include <conio.h> 
#include <string.h> 
#include <time.h>


void openaccount();//开户 
void save();//存款 
void withdraw();//取款 
void showAccount();//查询 
void cancelAccount(); //注销账户 
int load();//登陆账号 
int accountnum=0;//定义全局变量，用来计算账户数目 
int nowaccount=0;//登录成功是的账户 
struct Bank 
{ 
  char account[20]; //账号 
  int balance;//账户余额 
  int state;//状态 
};  //结构体 
struct Bank banks[100]; 
int load() 
{ 
  int right=0,i=0,j; 
  int r1,r2; 
  char account1[20]= {0}; 
  for(j=0; j<accountnum; j++) 
  { 
    r1=strcmp(account1,banks[j].account); 
    if(r1==0&&r2==0) 
    { 
      nowaccount=j; 
      if(banks[j].state==0) 
      { 
        printf("登录成功！\n");//登录成功 
        right=1; 
      } 
      break; 
    } 
  } 
  
  if(right==0) 
    printf("登陆失败！\n"); 
  return right; 
} 
int main() 
{ 
  int i=0,num; 
  char a[100]; 
  FILE *fp; 
  if((fp=fopen("account.txt","r"))==NULL) 
  { 
    if((fp=fopen("account.txt","w"))==NULL) 
    { 
      printf("失败！\n"); 
      exit(1); 
    } 
  } 
  while(fscanf(fp,"%s%s%d",banks[i].account,banks[i].balance,&banks[i].state)!=EOF) 
  { 
    accountnum++; 
    i++; 
  } 
  fclose(fp); 
  printf("欢迎来到我的银行\n"); 
  while(1) 
  { 
    printf("请选择业务:\n"); 
    printf("1.开户  \n");
    printf("2.存款  \n");
    printf("3.取款  \n");
    printf("4.查询  \n"); 
    printf("5.销户  \n"); 
    printf("0.退出  \n"); 
    scanf("%s",a); 
    num=atoi(a); 
    if(num==1) 
      openaccount();//开户 
    else if(num==2) 
      save();//存款 
    else if(num==3) 
      withdraw();//取款 
    else if(num==4) 
      showAccount();//查询 
    else if(num==5) 
      cancelAccount(); //注销账户 
    else if(num==0) 
    { 
      printf("欢迎下次再来\n"); 
      break; 
    } 
  
    else
      printf("抱歉，没有此业务\n"); 
  } 
  if((fp=fopen("account.txt","w"))==NULL) 
  { 
    printf("失败！\n"); 
    exit(1); 
  } 
  for(i=0; i<accountnum; i++) 
  { 
    fprintf(fp,"%s\t%s\t%d\n",banks[i].account,banks[i].balance,banks[i].state); 
  } 
  fclose(fp); 
  return 0; 
} 
void openaccount() 
{ 
  
  int i=0,j=0; 
  int r; 
  char ch; 
  printf("账户（十位数）：\n"); 
  scanf("%s",banks[accountnum].account); 
  while(banks[accountnum].account[i]!='\0') 
    i++; 
  if(i!=10) 
  { 
    printf("输入账号有误\n"); 
    return; 
  } 
  {
  printf("开户成功\n"); 
  }
}
void save() 
{ 
  if(load()!=1) 
    return; 
  char addmoney[10];//存入金额 
  int money;//将字符型转化为int型 
  int i=0; 
  printf("存入金额:\n"); 
  scanf("%s",addmoney); 
  while(addmoney[i]!='\0') 
  { 
    if(addmoney[i]<'0'||addmoney[i]>'9') 
    { 
      printf("输入格式错误！\n"); 
      return; 
    } 
    i++; 
  } 
  while(addmoney[i]!='\0') 
  { 
    if(i>9) 
    { 
      printf("金额超限\n"); 
      return; 
    } 
    i++; 
  } 
  money=atoi(addmoney); 
  if(money==0) 
  { 
    printf("存款失败\n"); 
    return; 
  } 
  else
  { 
    banks[nowaccount].balance+=money; 
    printf("存款成功\n"); 
  } 
} 
void withdraw() 
{ 
  if(load()!=1) 
    return; 
  char reducemoney[10];//取款金额 
  int money,i=0; 
  printf("请输入取款金额\n"); 
  scanf("%s",reducemoney); 
  while(reducemoney[i]!='\0') 
  { 
    if(reducemoney[i]<'0'||reducemoney[i]>'9') 
    { 
      printf("输入格式错误！\n"); 
      return; 
    } 
    i++; 
  } 
  while(reducemoney[i]!='\0') 
  { 
    if(i>9) 
    { 
      printf("金额超限\n"); 
      return; 
    } 
    i++; 
  } 
  money=atoi(reducemoney); 
  if(money==0) 
  { 
    printf("取款失败\n"); 
    return; 
  } 
  else
  { 
    if(money>banks[nowaccount].balance) 
      printf("您的账户没有这么多余额,取款失败!\n"); 
    else
    { 
      banks[nowaccount].balance-=money; 
      printf("取款成功\n"); 
    } 
  } 
} 
void showAccount() 
{ 
  if(load()!=1&&load()!=2) 
    return; 
  printf("您的账户信息如下：\n"); 
  printf("账号：%s\t余额：%d\n",banks[nowaccount].account,banks[nowaccount].balance);
  return ;
}

cancelAccount()函数没有实现

报错的这个函数找不到实现代码啊，只有函数申明