find.c

学生管理系统c

#include <stdio.h>
#include "h.h"
void find()
{
    flag=0,flag2=1;
    printf("\n\tChoose you want from 1 to 4:");
    scanf("%d",&flag); 
	if(flag==1)   /*按学号查找*//*要定义float flag；并在二级选择菜单中是输入 实数 */
    {
        if((fp=fopen("student.dat","rb"))==0)
		{
		printf("cannot find!");
		exit(0);
		}
        for(i=0;fread(&st[i],LEN,1,fp)!=0;i++);
		n=i;
        printf("\tplease input the student's number:");
        scanf("%s",&s.num);
		printf("\nnumber    name             sex      score                                  ave ");
        for(i=0;i<n;i++)
			if(strcmp(s.num,st[i].num)==0)
    		{
                printf("\n%-10s%-10s%10s",st[i].num,st[i].name,st[i].sex);
				for(j=0;j<K;j++)
					printf("%8d",st[i].score[j]);
				printf("%8.2f",st[i].ave);
				flag2=0;
    		}	
		if(flag2!=0)printf("\nCannot find the student number!\n");
            fclose(fp);
    }
	if(flag==2)/*按姓名查找*/
    {
		flag2=1;
        fp=fopen("student.dat","rb");
        for(i=0;fread(&st[i],LEN,1,fp)!=0;i++);
		n=i;
        printf("\tplease input name:");
        scanf("%s",&s.name);
        for(i=0;i<n;i++)
		{
			if(strcmp(s.name,st[i].name)==0)
    		{
                printf("\n%-10s%-10s%10s",st[i].num,st[i].name,st[i].sex);
				for(j=0;j<K;j++)
					printf("%8d",st[i].score[j]);
				printf("%8.2f",st[i].ave);
				flag2=0;
    		}
		}
		if(flag2!=0)printf("\nCannot find the student name!\n");
            fclose(fp);
    }
    if(flag==3)/*按ave查找*/
    {
		flag2=0;
        fp=fopen("student.dat","rb");
        for(i=0;fread(&st[i],LEN,1,fp)!=0;i++);
		n=i;
        printf("\tplease input avescore:");
        scanf("%f",&s.ave);
        for(i=0;i<n;i++)
		{
			if(s.ave>st[i].ave)/*条件*/
    		{
				flag2=1;
				printf("\n%-10s%-10s%10s",st[i].num,st[i].name,st[i].sex);
				for(j=0;j<K;j++)
					printf("%8d",st[i].score[j]);
				printf("%8.2f",st[i].ave);	
			}
		}
		if(flag2!=1)printf("Nobody under this average score!\n");
    }
	if(flag==4)
	{
		main();
	}
	else find();
}