PS:老师叫弄得一个模拟发布五福代码，要求

1.敬业福发布的概率是其他的0.1倍 

2.敬业福的数量不超过10张，且每次都保存

//就是程序退出以后还是保存数据

代码:

#include "stdio.h"
#include "time.h"
#include "stdlib.h"
void meun(int num);
int main(){  
  int a,num,i,b;  
  FILE *fp;  
  if((fp=fopen("C:\\Users\\Sure\\Desktop\\text.txt","r+"))==NULL){   
     printf("fail to open file\n");       
     exit(0);  
  }  
  fscanf(fp,"%d",&num);  
  meun(num);  
  while(~scanf("%d",&a)){   
      srand(time(0));   
      if(a==2) return 0;   
      else{    
        if(num<10){      
          b=rand()%41+1;      
          if(b<=10) printf("你获得爱国福一张！\n");      
          else if(b<=20 && 10<b) printf("你获得和谐福一张!\n");      
          else if(b<=30 && 20<b) printf("你获得友善福一张！\n");               
          else if(b<=40 && 30<b) printf("你获得富强福一张!\n");            
          else{       printf("你获得敬业福一张！\n");      
          num++;      
          rewind(fp);         
          fprintf(fp,"%d",num);      
          }    
        }       
     else{       b=rand()%40+1;      
     if(b<=10) printf("你获得爱国福一张！\n");      
     else if(b<=20 && 10<b) printf("你获得和谐福一张!\n");      
     else if(b<=30 && 20<b) printf("你获得友善福一张！\n");                
     else if(b<=40 && 30<b) printf("你获得富强福一张!\n");    
     }      
    }  
  }  
  fclose(fp);  
  return 0;  
}

void meun(int num){    
    printf("*********************\n");  
    printf("*******集五福*******\n");  
    printf("       1.生成五福\n");  
    printf("       2.退出系统\n");   
    printf("*********************\n");  
    printf("    已发出的敬业福数量：%d\n",num);  
    printf("请输入你的选择:");
}