这个程序问题怎么改啊兄弟姐妹们

#include "stdio.h"
void main()
{
    struct student
        {
        int xuehao;
        char name[20];
        float score1;
        float score2;
        float score3;
        float ave;
        };
        struct student stu[10];
        int i,j,k,m,y,t;
        
        printf("请输入学生数\n");
        scanf("%d",&k);
        printf("请输入学生姓名学号成绩");
        for(i=0;i<k;i++)
        scanf("%s %d %f %f %f",stu[i].name,&stu[i].xuehao,&stu[i].score1,&stu[i].score2,&stu[i].score3);
        for(j=0;j<k;j++)
        printf("%s %d %.0f %.0f %0.f %.2f\n ",stu[j].name,stu[j].xuehao,stu[j].score1,stu[j].score2,stu[j].score3,(stu[j].score1+stu[j].score2+stu[j].score3)/3);
        printf("是否按学号查找\n",y)；
            scanf("%d",&y);
        if(y>0)
        {   
            printf("请输入您所需要查找的学号:\n");
            scanf("%d",&m);
            for(i=0;i<k;i++)
            {
            if(m == stu.xuehao[i])
            t = m;
            printf("%d\n",t);

            
        }
            else break;
}