要求是按照英文名字首字母排序，输出名字成绩和专业，我写的哪里有问题

#include <stdio.h>
#include <string.h>
typedef struct
{
char name[15];
int grade;
char major[15];
}studentRecord;
int main()
{
int m,i,j;
setvbuf(stdout,NULL,_IONBF,0);
printf("Please input the number of students(<=50):");
start:
scanf("%d",&m);
studentRecord student[m];
if(m<=50)
{
printf("Please input students'information:\n");
for(i=0;i<m;i++)
{
scanf("%s %d %s\n",student[m].name,&student[m].grade,student[m].major);
}
for(i=0;i<m-1;i++)
{
for(j=i+1;j<m;j++)
{
if(strcmp(student[i].name,student[j].name)>0)
{
char temp;
strcpy(temp,student[i].name);
strcpy(student[i].name,student[j].name);
strcpy(temp,student[j].name);

            }
        }

    }
    for(i=0;i<m;i++)
    {
        printf("%s %d %s",student[i].name,student[i].grade,student[i].major);
    }

}
else
{
    printf("Warning:Please input a number which does not exceed 50.\n");
    printf("Input again:");
    goto start;
}

修改如下，供参考：

#include <stdio.h>
#include <string.h>
#define N 50              //修改
typedef struct studentRec //修改
{
    char name[15];
    int  grade;
    char major[15];
}studentRecord;
int main()
{
    int m, i, j;
    studentRecord student[N] = { 0 };  //修改
    setvbuf(stdout, NULL, _IONBF, 0);
    printf("Please input the number of students(<=50):");
start:
    scanf("%d", &m);
    if (m <= 50)
    {
        printf("Please input students'information:\n");
        for (i = 0; i < m; i++)
        {
            scanf("%s %d %s", student[i].name, &student[i].grade, student[i].major); //修改
            //scanf("%s %d %s\n", student[m].name, &student[m].grade, student[m].major);
        }
        for (i = 0; i < m - 1; i++)
        {
            for (j = i + 1; j < m; j++)
            {
                if (strcmp(student[i].name, student[j].name) > 0)
                {
                    studentRecord temp;  //修改
                    temp = student[i];   //修改
                    student[i] = student[j];//修改
                    student[j] = temp;    //修改
                }
            }

        }
        for (i = 0; i < m; i++)
        {
            printf("%s %d %s\n", student[i].name, student[i].grade, student[i].major);
        }

    }
    else
    {
        printf("Warning:Please input a number which does not exceed 50.\n");
        printf("Input again:");
        goto start;
    }
}