可以运行，但不能进行输入。是哪里错了吗？（新手）

# include <stdio.h>
# include <malloc.h>

struct Students
{
   int age;
   char name[20];
   float score;
};

int main()
{
    int i;
    int quantitylen;
    struct Students * pArr;
   
    printf("请输入想要登记的学生人数:\n");
    printf("quantitylen = ");
    scanf("%d\n", &quantitylen);
   
    pArr = (struct Students * )malloc(quantitylen * sizeof(struct Students));
   
    for (i = 0; i < quantitylen; ++i)
    {
        printf ("请输第%d个人学生信息\n", i+1);        
        printf ("age = ");
        scanf ("%d", &pArr[i].age);
        
        printf ("name = ");
        scanf ("%s", pArr[i].name);
        
        printf ("score = ");
        scanf ("%f", &pArr[i].score);

    }
   
    for (i = 0; i < quantitylen; ++i)
    {
        printf ("第%d个入学生信息是：\n", i+1);        
        printf ("age = ");
        printf ("age = %d", pArr[i].age);
        
        printf ("name = ");
        printf ("name = %s", pArr[i].name);
        
        printf ("score = ");
        printf ("score = %f", pArr[i].score);
    }   
    return 0;
}