c - 结构数组在最后一个索引处失败

Question

#include <stdio.h>
#include <string.h>
#include <string.h>
struct student
{
     int id;
     char name[30];
     float percentage;
};

int main()
{
     int i;
     struct student record[2];

     // 1st student's record
     record[0].id=1;
     strcpy(record[0].name, "Raju");
     record[0].percentage = 86.5;

     // 2nd student's record
     record[1].id=2;
     strcpy(record[1].name, "Surendren");
     record[1].percentage = 90.5;

     // 3rd student's record
     record[2].id=3;

     //strcpy(record[2].name, "Thiyagu");//--->Bug in this line

     //record[2].percentage = 81.5;//--->Bug in this line


     for(i=0; i<3; i++)
     {
         printf("     Records of STUDENT : %d \n", i+1);
         printf(" Id is: %d \n", record[i].id);
         printf(" Name is: %s \n", record[i].name);
         printf(" Percentage is: %f\n\n",record[i].percentage);
     }
     return 0;
}

我很难调试这段代码。出于某种原因，我标记 (-->) 的行破坏了代码。现在这一行和下面的一行被注释掉了，因为代码不与它们一起执行。我有一种感觉，它必须对空终止符做些什么。

Answer 1

struct student record[2]; 表示该数组有 2 个条目。有效索引为 0 和 1。

尝试访问 record[2] 导致 undefined behaviour .