随机点名系统

实训老师讲的，又学到了

贴下代码

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 int x=15;
 5 
 6 int main()
 7 {
 8     FILE *fp;
 9     char name[50][20];
10     int i,flag;
11     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
12     for(i=0; i<x; i++)
13     {
14         fscanf(fp,"%s",name[i]);
15     }
16     fclose(fp);
17 
18     srand((unsigned)time(NULL));
19     for(i=0; i<x; i++)
20     {
21         flag=rand()%x;
22         printf("点名：");
23         printf("%s
",name[flag]);
24     }
25 }

还有一个，差不多

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 int x=10;
 5 
 6 int main()
 7 {
 8     FILE *fp;
 9     char name[50][20]= {"zhao","qian","sun","li"};
10     int i,flag;
11     fp=fopen("D:\fan.txt","wt");//在D盘建立fan.txt;
12 
13     srand((unsigned)time(NULL));
14     for(i=0; i<4; i++)
15     {
16         fprintf(fp,"%s
",name[i]);
17     }
18     fclose(fp);
19 
20     fopen("D\:fan.txt","r");
21     for(i=0; i<x; i++)
22     {
23         flag=rand()%4;
24         fscanf(fp,"%s",name[flag]);
25         printf("点名：");
26         printf("%s
",name[flag]);
27     }
28     fclose(fp);
29 }

还有：

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4  int x=15;
 5 
 6  int main()
 7  {
 8      FILE *fp;
 9      char name[50][20],n[10]={"徐"};
10      int i,flag;
11      fp=fopen("D:\fan.txt","a");//追加一个字符串。
12      //fprintf(fp,"%s
",n);
13      //fputs("xu
",fp);
14      fprintf(fp,"徐
",n);
15      fclose(fp);
16 
17      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
18      rewind(fp);//指针移到文件头部
19      for(i=0; i<x; i++)
20      {
21          //fscanf(fp,"%s",name[i]);
22          fgets(name[i],x,fp);
23      }
24      fclose(fp);
25 
26      srand((unsigned)time(NULL));
27      for(i=0; i<x; i++)
28      {
29          flag=rand()%x;
30          printf("点名：");
31          printf("%s
",name[flag]);
32      }
33  }