请大家帮我检查一个简单的C程序

代码如下：

#include 
#include 
#include 
#define maxn 99
struct student{
char name[20];
int grade;
} stu[maxn];
int cmp(const void*a, const void*b)
{
return ((struct student*)a)->grade - ((struct student*)b)->grade;
}
int main(void)
{
puts("Please input the name and the grade:");
int i = 0;
while(scanf("%s %d", stu[i].name, &stu[i].grade) == 2)
{
getchar();
++i;
}
qsort(stu,i, sizeof(struct student), cmp);
int j;
for (j = 0; j printf("%s : %d\n", stu[j].name, stu[j].grade);
puts("Please input the grade you want to search:");
float temp = 0;
while (scanf("%d", &temp))
{
struct student *p;
p =(struct student*) bsearch(&temp, stu, i, sizeof(struct student), cmp);
if (p)
printf("%s : %d\n", p->name, p->grade);
else
puts("not found!");
}
return 0;
}

输出如下: