#include <stdio.h>
#include <stdlib.h>
struct stud_tpye
{char name[20];
   long num;
   int age;
   char sex;
   };
   
main()
{
   struct stud_tpye student[1],*p;
   int i;
   char numstr[20];
   for (i=0,p=student;i<1;p++,i++)
   {printf("Enter all data of student[%d]:\n",i);
      scanf("%s%ld%d%c",p->name,&p->num,&p->age,&p->sex);
      }
      for (i=0,p=student;p<student+1;p++,i++);
      printf("%3d%-20s%8ld%6d%3c\n",i,p->name,p->num,p->age,p->sex);
   
}

#include <stdio.h>
#include <stdlib.h>
struct stud_tpye
{char name[20];
   long num;
   int age;
   char sex;
   };
   
main()
{
   struct stud_tpye student[1],*p;
   int i;
   char numstr[20];
   for (i=0,p=student;i<1;p++,i++)
   {
        printf("Enter all data of student[%d]:\n",i);
        scanf("%s%ld%d%c",p->name,&p->num,&p->age,&p->sex);
    }
    for (i=0,p=student;p<student+1;p++,i++);//<---多了个分号！！！！！！！！！
      printf("%3d%-20s%8ld%6d%3c\n",i,p->name,p->num,p->age,p->sex);
   
}

for (i=0,p=student;p<student+1;p++,i++); 多了个分号。for (i=0,p=student;p<student+1;p++,i++)

谢谢哈