班级程序管理系统 还是有很多问题 感谢指点
摸索着自学了一段时间写了个程序，遇到了很多问题，调试 输入 输出，再调试......总算体会到程序猿的痛苦。特别是cin的输入判断问题，我搜索了很久没有满意的答案，最后自己考虑用数组的形式来存储 判断。
程序还不完善，感谢各位大神查看，指点。
程序代码：#include<iostream>
using namespace std;
struct zh
{
char name[20];
int yw;
int sx;
int yy;
int sw;
int hx;
}xs[100], px[100], *pp;
int I = 0;
char caidan();//菜单模块
void cjlr();//成绩录入模块
void cjxs();//成绩显示模块
void cjbc();//成绩保存模块
void cjpx();//成绩排序模块
void cjxg();//成绩修改模块
void cjtj();;//成绩统计模块
int srpd();//输入判断模块 返回输入值
int main()
{
top:char xz;
xz = caidan();
switch (xz)
{
case 'a':cjlr(); goto top;
case 'b':cjxs(); goto top;
case 'c':cjbc(); goto top;
case 'd':cjpx(); goto top;
case 'e':cjxg(); goto top;
case 'f':cjtj(); goto top;
case 'g':break;
default:
cout << "错误";;
break;
}
}
char caidan()
{
char a[50];
system("cls");
cout << endl;
cout << "\t\t\t班级成绩管理系统" << endl;
cout << "\t请选择系统功能项：（输入前面的字母）" << endl << endl;
cout << "a.成绩录入" << endl;
cout << "b.成绩显示" << endl;
cout << "c.成绩保存" << endl;
cout << "d.成绩排序" << endl;
cout << "e.成绩修改" << endl;
cout << "f.成绩统计" << endl;
cout << "g.退出系统" << endl << endl;
cout << "请输入您的选择：";
cin >> a;
while (1) //采用字符组判断输入的是否正确 不重复 不带多个字符
{
if (a[0] >= 'A'&& a[0] <= 'G')
{
a[0] += 32;
}
if (a[0] < 'a' || a[0]>'g' || a[1] != '\0')
{
cout << "输入错误,请重新输入：";
cin >> a;
}
else
{
break;
}
}
return (a[0]);
}
void cjlr()
{
top2:char a[20];
system("cls");
cout << endl;
cout << "\t\t\t班级成绩管理系统" << endl;
cout << "\t成绩录入模块" << endl << endl;
cout << "请输入姓名:";
cin >> xs[I].name;
cout << "请输入语文成绩:";
xs[I].yw = srpd();
cout << "请输入数学成绩:";
xs[I].sx = srpd();
cout << "请输入英语成绩:";
xs[I].yy = srpd();
cout << "请输入生物成绩:";
xs[I].sw = srpd();
cout << "请输入化学成绩:";
xs[I].hx = srpd();
cout << "是否继续输入下个学生（Y/N）:";
cin >> a;
while (1) //采用字符组判断输入的是否正确 不重复 不带多个字符
{
if (a[0] == 'Y' || a[0] == 'N')
{
a[0] += 32;
}
if (a[0] != 'y' && a[0] != 'n')
{
cout << "输入错误,请重新输入：";
cin >> a;
continue;
}
if (a[1] != '\0')
{
cout << "输入错误,请重新输入：";
cin >> a;
}
else if (a[0] == 'y')
{
I++;
goto top2;
}
else
I++;
break;
}
}
void cjxs()
{
int i = 0;
system("cls");
cout << endl;
cout << "\t\t\t班级成绩管理系统" << endl;
cout << "\t成绩显示模块" << endl << endl;
cout << "序号\t" << "姓名\t" << "语文\t" << "数学\t" << "英语\t" << "生物\t" << "化学\t" << endl;
//for (int i = 0; i < length; i++)
while (xs[i].name[0] != '\0')
{
cout << i << "\t" << xs[i].name << "\t" << xs[i].yw << "\t" << xs[i].sx << "\t" << xs[i].yy << "\t" << xs[i].sw << "\t" << xs[i].hx << "\t" << endl;
i++;
}
system("pause");
}
void cjbc()
{
FILE *fp;
errno_t err;
int i = 0;
pp = xs;
system("cls");
cout << endl;
cout << "\t\t\t班级成绩管理系统" << endl;
cout << "\t成绩显示模块" << endl << endl;
if ((err = fopen_s(&fp, "学生成绩.txt", "wt+")) != 0)
cout << "无法打开此文件"; //如果打不开，就输出打不开
while (xs[i].name[i] != '\0')
{
fwrite(&xs[i], sizeof(struct zh), i, fp);
i++;
}
cout << "保存成功" << endl;
fclose(fp); //关闭文件
system("pause");
}
void cjpx()
{
system("cls");
cout << endl;
cout << "\t\t\t班级成绩管理系统" << endl;
cout << "\t成绩排序模块" << endl << endl;
int i = 0, a, b, c, j = 0;
while (xs[i].name[0] != '\0')
{
px[i].yw = xs[i].yw;
px[i].sx = xs[i].sx;
px[i].yy = xs[i].yy;
px[i].sw = xs[i].sw;
px[i].hx = xs[i].hx;
i++;
}
for (a = 0; a < i - 1; a++)
{
for (b = 0; b < i - 1 - a; b++)
{
if (px[b].yw > px[b + 1].yw)
{
c = px[b].yw;
px[b].yw = px[b + 1].yw;
px[b + 1].yw = c;
}
if (px[b].sx > px[b + 1].sx)
{
c = px[b].sx;
px[b].sx = px[b + 1].sx;
px[b + 1].sx = c;
}
if (px[b].yy > px[b + 1].yy)
{
c = px[b].yy;
px[b].yy = px[b + 1].yy;
px[b + 1].yy = c;
}
if (px[b].sw > px[b + 1].sw)
{
c = px[b].sw;
px[b].sw = px[b + 1].sw;
px[b + 1].sw = c;
}
if (px[b].hx > px[b + 1].hx)
{
c = px[b].hx;
px[b].hx = px[b + 1].hx;
px[b + 1].hx = c;
}
}
}
cout << "序号\t" << "语文\t" << "数学\t" << "英语\t" << "生物\t" << "化学\t" << endl;
while (j < i)
{
cout << j << "\t" << px[j].yw << "\t" << px[j].sx << "\t" << px[j].yy << "\t" << px[j].sw << "\t" << px[j].hx << "\t" << endl;
j++;
}
system("pause");
}
void cjxg()
{
top3:char a[20], b[20];
int i, j = 0, k, pd;
system("cls");
cout << endl;
cout << "\t\t\t班级成绩管理系统" << endl;
cout << "\t成绩修改模块" << endl << endl;
cout << "请输入所需修改学生的名字:";
cin >> a;
while (a[j] != '\0')
{
j++;
}
for (i = 0; i <= I; i++)
{
pd = 0;
for (k = 0; k <= j; k++)
{
if (xs[i].name[k] == a[k]) pd = 1;
else
{
pd = 0;
break;
}
}
if (pd)
{
break;
}
}
if (pd)
{
cout << "请修改语文成绩:";
xs[i].yw = srpd();
cout << "请修改数学成绩:";
xs[i].sx = srpd();
cout << "请修改英语成绩:";
xs[i].yy = srpd();
cout << "请修改生物成绩:";
xs[i].sw = srpd();
cout << "请修改化学成绩:";
xs[i].hx = srpd();
}
else
{
cout << "查无此人" << endl;
}
cout << "是否继续输入下个学生（Y/N）:";
cin >> b;
while (1) //采用字符组判断输入的是否正确 不重复 不带多个字符
{
if (b[0] == 'Y' || b[0] == 'N')
{
b[0] += 32;
}
if (b[0] != 'y' && b[0] != 'n')
{
cout << "输入错误,请重新输入：";
cin >> b;
continue;
}
if (b[1] != '\0')
{
cout << "输入错误,请重新输入：";
cin >> b;
}
else if (b[0] == 'y')
{
I++;
goto top3;
}
else
break;
}
}
void cjtj()
{
double b[5] = {0};
int i;
system("cls");
cout << endl;
cout << "\t\t\t班级成绩管理系统" << endl;
cout << "\t成绩统计模块" << endl << endl;
cout << "\t" << " 语文\t" << " 数学\t" << " 英语\t" << " 生物\t" << " 化学\t" << endl;
for ( i = 0; i <=I; i++)
{
b[0] += xs[i].yw;
}
for (i = 0; i <= I; i++)
{
b[1] += xs[i].sx;
}
for (i = 0; i <= I; i++)
{
b[2] += xs[i].yy;
}
for (i = 0; i <= I; i++)
{
b[3] += xs[i].sw;
}
for (i = 0; i <= I; i++)
{
b[4] += xs[i].hx;
}
b[0] /= I;
b[1] /= I;
b[2] /= I;
b[3] /= I;
b[4] /= I;
cout <<"平均成绩：\t" << b[0] << "\t" << b[1] << "\t" << b[2] << "\t" << b[3] << "\t" << b[4] << "\t"<<endl;
system("pause");
}
int srpd()
{
char a[20];
int b = -1, i = 1;
cin >> a;
while (1)
{
if (a[1] != '\0' && a[2] != '\0'&&a[3] != '\0')
{
cout << "输入错误,请重新输入：";
cin >> a;
continue;
}
while (a[i] != '\0')
{
i++;
}
switch (i)
{
case 1:
if (a[0]<'0' || a[0]>'9')
{
break;
}
b = int(a[0]) - 48;
break;
case 2:
if (a[0]<'0' || a[0]>'9')
{
break;
}
else if (a[1]<'0' || a[1]>'9')
{
break;
}
b = (int(a[0]) - 48) * 10;
b = b + (int(a[1]) - 48);
break;
case 3:
if (a[0]<'0' || a[0]>'9')
{
break;
}
else if (a[1]<'0' || a[1]>'9')
{
break;
}
else if (a[2]<'0' || a[2]>'9')
{
break;
}
b = (int(a[0]) - 48) * 100;
b = b + (int(a[1]) - 48) * 10;
b = b + (int(a[2]) - 48);
break;
default:
cout << "致命错误：" << endl;
break;
}
if (b >= 0 && b <= 100)
break;
else
{
cout << "输入错误,请重新输入：";
cin >> a;
i = 1, b = -1;
}
}
return b;
}
