随机点名系统

实训老师讲的，又学到了

贴下代码

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int x=15;

int main()
{
    FILE *fp;
    char name[50][20];
    int i,flag;
    fp=fopen("D:\fan.txt","r");//首先在D盘建一个fan.txt,里面要有字符串，以回车或空格为间隔
    for(i=0; i<x; i++)
    {
        fscanf(fp,"%s",name[i]);
    }
    fclose(fp);

    srand((unsigned)time(NULL));
    for(i=0; i<x; i++)
    {
        flag=rand()%x;
        printf("点名：");
        printf("%s
",name[flag]);
    }
}

还有一个，差不多

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int x=10;

int main()
{
    FILE *fp;
    char name[50][20]= {"zhao","qian","sun","li"};
    int i,flag;
    fp=fopen("D:\fan.txt","wt");//在D盘建立fan.txt;

    srand((unsigned)time(NULL));
    for(i=0; i<4; i++)
    {
        fprintf(fp,"%s
",name[i]);
    }
    fclose(fp);

    fopen("D\:fan.txt","r");
    for(i=0; i<x; i++)
    {
        flag=rand()%4;
        fscanf(fp,"%s",name[flag]);
        printf("点名：");
        printf("%s
",name[flag]);
    }
    fclose(fp);
}

还有：

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
 int x=15;

 int main()
 {
     FILE *fp;
     char name[50][20],n[10]={"徐"};
     int i,flag;
     fp=fopen("D:\fan.txt","a");//追加一个字符串。
     //fprintf(fp,"%s
",n);
     //fputs("xu
",fp);
     fprintf(fp,"徐
",n);
     fclose(fp);

     fp=fopen("D:\fan.txt","r");//首先在D盘建一个fan.txt,里面要有字符串，以回车或空格为间隔
     rewind(fp);//指针移到文件头部
     for(i=0; i<x; i++)
     {
         //fscanf(fp,"%s",name[i]);
         fgets(name[i],x,fp);
     }
     fclose(fp);

     srand((unsigned)time(NULL));
     for(i=0; i<x; i++)
     {
         flag=rand()%x;
         printf("点名：");
         printf("%s
",name[flag]);
     }
 }