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atm机问题,求解释 #include<stdio.h> #include<string.h> #include<stdlib.h> #include<process.h> int n,i,j,k; FILE *fp;      int money=1000;       int mon,mon1;      char temp1[15],temp2[15];      char password[15]={"111111"};      char password1[15];      char temp[15];      int state=1; void main() { void save(); void xiugai(); void qukuan(); void search(); void exit();      printf("     Welcome to use our ATM\n");      printf("    ***********************************\n");      printf("       1.存款\n");      printf("       2.修改密码\n");      printf("       3.取款\n");      printf("       4.查询余额\n");      printf("       5.退出\n");      printf("    ***********************************\n");      for(k=0;k<=4;k++)      {          printf(" 请选择您要办理的业务:");      scanf("%d",&n);      if(n==5)      {          printf("欢迎您使用,再见!\n");          break;      }      switch(n)      {      case 1:          save();          break;      case 2:          xiugai();          break;      case 3:          qukuan();              break;      case 4:          search();          break;      case 5:          exit();          break;      default:          printf("对不起,错误操作\n");      }      if(state==0)      {      break;      state=1;      }      } } void save() {      FILE *fp;      if((fp=fopen("mima.txt","r"))==NULL)
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