求名位看看，循环那里出了什么问题，为什么else语句每次都会被执行，而且执行两遍
#include <stdio.h>#include <string.h>
#define CSIZE 4
struct name{
char first[10];
char last[10];
};
struct student{
struct name names;
float grade[3];
float avge;
};
void Enter_grades(struct student *pt);//数据录入
void Per_aver(struct student *pt);//求平均值
void Show_value(struct student *pt);//输出
float Average(struct student *pt);//求总平均值
int main(void)
{
char ch, *ans;
struct student stu_name[CSIZE];
float avge;
puts("--------------------------------------");
puts("d) Enter_grades e) Per_aver");
puts("f) Show_value g) Average");
puts("Please enter the menu options");
puts("--------------------------------------");
while((ch = getchar()) != NULL && ch != 'q' )
{
if(strchr("defg", ch)) //这个地方哪里写的不对，为什么一执行就出3遍提示输出错误？
{
switch(ch)
{
case 'd': Enter_grades(stu_name); break;
case 'e': Per_aver(stu_name); break;
case 'f': Show_value(stu_name); break;
case 'g': avge = Average(stu_name); break;
default: break;
}
}
else
puts("Enter error, Please input ch:"); //这个语句每次都会被执行
}
return 0;
}
void Enter_grades(struct student *pt)
{
int i, j;
for(i = 0; i < CSIZE; i++)
{
printf("please input the names[%d]:\n", i+1);
gets(pt[i].names.first);
gets(pt[i].names.last);
puts("ipput the value");
for(j = 0; j < 3; j++)
scanf("%f", &pt[i].grade[j]);
}
}
void Per_aver(struct student *pt)
{
int i ,j;
float total;
for(i = 0; i < CSIZE; i++)
{
total = 0;
for( j = 0; j < 3; j++)
total += pt[i].grade[j];
pt[i].avge = total / 3;
}
puts("平均分已求出");
}
float Average(struct student *pt)
{
float total;
for(int i = 0; i < CSIZE; i++)
total += pt[i].avge;
return total/3;
}
void Show_value(struct student *pt)
{
int i,j;
for(i = 0; i < CSIZE; i++)
{
printf("%s %s\n",pt[i].names.first,pt[i].names.last);
for(j = 0; j < 3; j++)
printf("%.2f \t",pt[i].grade[j]);
printf("\n%.2f\n", pt[i].avge);
}
printf("The total average score of the class is %.2f\n", Average);
}
求各位看看，哪里出了问题
