求大神帮助修改和完善这个程序
这个程序有些问题，C++学得不好，希望大神可以帮我完善，或者更改一些主函数，让程序更完整谢谢！！！#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MAXN 35
#define MAX_NAME 256
typedef struct student //学生信息
{
int no;
char name[MAX_NAME];
double english;
double math;
double Programming;
double mark_ave;
double mark_tot;
} STUDENT;
/*-----------输入信息子程序---------*/
void input(STUDENT *data, int *len)
{
int no;
putchar('\n');
printf("%s\n", "请输入新的记录，如果需要退出当前菜单请输入0.");
printf("%s\n", "格式：\n学号 姓名 性别 年龄 年级\n");
putchar('\n');
printf("例如:\n");
printf("1 张三 男 19 大一\n");
scanf("%d", &no);
while(no !=0) {
data[*len].no = no;
scanf("%s %lf %lf %lf", data[*len].name, &data[*len].english, &data[*len].math,&data[*len].Programming); data[*len].mark_ave=(data[*len].english+data[*len].math+data[*len].Programming)/3.0; data[*len].mark_tot=data[*len].english+data[*len].math+data[*len].Programming;
(*len)++;
scanf("%d", &no);
}
}
/*---------------输出信息子程序---------------*/
void output(STUDENT *data, int len)
{
int i;
system("cls");
printf("%8s", "学号");
printf("%8s", "姓名");
printf("%8s", "英语");
printf("%8s", "数学");
printf("%10s", "C语言");
printf("%12s", "平均分");
printf("%10s", "总分");
putchar('\n');
for (i =0; i < 80; i++)
putchar('=');
putchar('\n');
for (i = 0; i< len; i++)
{
printf("%8d", data[i].no);
printf("%8s", data[i].name);
printf("%8.1lf", data[i].english);
printf("%8.1lf", data[i].math);
printf("%10.1lf", data[i].Programming);
printf("%12.1lf", data[i].mark_ave);
printf("%10.1lf", data[i].mark_tot);
putchar('\n');
}
for (i =0; i < 80; i++)
putchar('=');
putchar('\n');
printf("按回车键继续.");
getchar();
getchar();
}
/*--------------排序子程序------------*/
void sort(STUDENT *data, int len)
{
int i,j,k;
STUDENT temp;
for (i=0; i<len-1; i++) {
for (k=i, j=i+1; j<len; j++)
if (data[k].mark_ave > data[j].mark_ave) k=j;
if (k != i) {
temp = data[i];
data[i] = data[k];
data[k] = temp;
}
}
}
/*--------------------搜索子程序-----------------------*/
void find(STUDENT *data, int len)
{
int find_no, result ;
int i;
lab: result=0;
printf("%s\n", "请输入需要查找的学生的学号，退出当前菜单请输入 0.");
scanf("%d", &find_no);
if (find_no == 0) return; /*exit the fine sub program*/
while( data[result].no != find_no && result < len) result ++;
if (result >= len ) {
printf("%s\n", "未查询到相关信息");
goto lab;
}
else {
system("cls");
printf("%s\n", "查询信息如下：");
for (i =0; i < 80; i++)
putchar('=');
putchar('\n');
printf("%8s", "学号");
printf("%8s", "姓名");
printf("%8s", "英语");
printf("%8s", "数学");
printf("%10s", "C语言");
printf("%12s", "平均分");
printf("%10s", "总分");
putchar('\n');
printf("%8d", data[result].no);
printf("%8s", data[result].name);
printf("%8.1lf", data[result].english);
printf("%8.1lf", data[result].math);
printf("%10.1lf", data[result].Programming);
printf("%12.1lf", data[result].mark_ave);
printf("%10.1lf", data[result].mark_tot);
putchar('\n');
for (i =0; i < 80; i++)
putchar('=');
putchar('\n');
goto lab;
}
}
/*-----------------插入子程序-------------*/
void insert(STUDENT *data, int *len)
{
int no, pos;
double english, math, Programming, mark_ave, mark_tot;
int i;
char name[MAX_NAME];
lab: printf("%s\n", "输入新的记录，退出当前菜单请输入0.");
printf("%s\n", "格式：学号 姓名 英语 数学 C语言");
scanf("%d", &no);
if (no == 0) return;
data[*len].no = no;
scanf("%s %lf %lf %lf", name, &english, &math, &Programming);
mark_ave=(english+math+Programming)/3.0;
mark_tot=english+math+Programming;
pos = 0;
while ((data[pos].mark_ave < mark_ave) && (pos < *len) )
pos ++;
for (i = *len-1; i >= pos; i--)
data[i+1] = data[i];
data[pos].no = no;
strcpy(data[pos].name, name);
data[pos].english = english;
data[pos].math = math;
data[pos].Programming = Programming;
data[pos].mark_ave = mark_ave;
data[pos].mark_tot = mark_tot;
(*len)++;
goto lab;
}
/*-------------删除子程序--------------*/
void delete_item(STUDENT *data, int *len)
{
int no, i, pos;
lab: pos=0;
printf("%s\n", "输入需要删除的学生的学号，退出当前菜单请输入0.");
scanf("%d", &no);
if (no == 0) return;
while( (data[pos].no != no) && (pos < *len) ) pos = pos +1;
if (pos >= *len) {
printf("%s\n", "未找到需要删除的学生");
goto lab;
}
else {
for (i = pos+1;i < *len; i++)
data[i-1] = data[i];
*len = *len -1;
if (*len == 0) {
printf("%s\n", "没有任何记录，请按回车键返回.");
getchar();
getchar();
return;
}
goto lab;
}
}
/*---------------统计子程序------------*/
void stat(STUDENT *data, int len)
{
int no_59=0, no_69=0, no_79=0, no_89=0, no_100=0;
int i;
for (i = 0;i < len; i++) {
if (data[i].mark_ave <=59) no_59++;
else if (data[i].mark_ave <=69) no_69++;
else if (data[i].mark_ave <=79) no_79++;
else if (data[i].mark_ave <= 89) no_89++;
else no_100++;
}
}
/*---------------显示信息子程序------------*/
void paint()
{
int i;
system("cls");
printf("%55s\n", "成绩管理系统 \n");
for (i = 0; i < 80; i++)
putchar('=');
putchar('\n');
printf(" 1 输入学生信息 2 查找学生信息\n");
printf(" 3 按平均分排序 4 按学号查找\n");
printf(" 5 输入学生成绩 6 按学号删除\n");
printf(" 7 保存到文件\n");
printf(" 0 退出\n");
for (i = 0; i<= 79; i++)
putchar('=');
putchar('\n');
printf("%s\n", "请输入各操作对应的序号:");
}
void save(STUDENT *data, int len)//将数据保存到文件
{
int i;
FILE *fp;
fp=fopen("成绩统计表.txt","w");
fprintf(fp,"%8s", "学号");
fprintf(fp,"%8s", "姓名");
fprintf(fp,"%8s", "英语");
fprintf(fp,"%8s", "数学");
fprintf(fp,"%10s", "C语言");
fprintf(fp,"%12s", "平均分");
fprintf(fp,"%10s\n", "总分");
fprintf(fp,"========================================================================\n");
putchar('\n');
for (i = 0; i< len; i++)
{
fprintf(fp,"%8d", data[i].no);
fprintf(fp,"%8s", data[i].name);
fprintf(fp,"%8.1lf", data[i].english);
fprintf(fp,"%8.1lf", data[i].math);
fprintf(fp,"%10.1lf", data[i].Programming);
fprintf(fp,"%12.1lf", data[i].mark_ave);
fprintf(fp,"%10.1lf\n", data[i].mark_tot);
}
fprintf(fp,"========================================================================\n");
fclose(fp);
printf("文件已保存到\"成绩统计表.txt\"");
getchar();getchar();
}
/*-----------主程序--------------*/
void main()
{
STUDENT data[MAXN];
int len = 0;
char ctrl_ch;
paint();
scanf("%c", &ctrl_ch);
while (ctrl_ch != '0') {
switch(ctrl_ch) {
case '1':
input(data, &len);
break;
case '2':
output(data, len);
break;
case '3':
sort(data, len);
break;
case '4':
find(data, len);
break;
case '5':
insert(data, &len);
break;
case '6':
delete_item(data, &len);
break;
case '7':
save(data, len);
break;
default:
if (ctrl_ch != '\n') printf("%s\n", "输入错误!");
break;
}
if (ctrl_ch != '\n') paint();
scanf("%c", &ctrl_ch);
}
}
