关于#c++#的问题：这个是用的c++的系统来做的
这个是用的c++的系统来做的，这是全部，主要是没思路，烦请每个的大纲说一下，谢谢
以上每个内容需要通过单独的函数来实现，数据以结构体数组的形式组织。
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
//定义学生的最大数量
#define MAXNMB 50
//定义课程数量
#define NMBKC 5
struct Student
{
int number; //学号
char name[20]; //姓名
int score[NMBKC];//保存课程成绩
float avg; //平均分
int mc; //名次
};
//显示信息
void Display(struct Student stu[],int nmb,char kecheng[][20])
{
int i;
char* xh ="学号";
char* xm ="姓名";
printf("%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
printf("%-10s",kecheng[i]);
printf("\n");
for (i = 0;i< nmb;i++)
{
printf("%-6d%-10s%-10d%-10d%-10d%-10d%-10d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4]);
}
}
//解析数据
int ParserStr(char* buf,char out[NMBKC][20])
{
int i = 0;
int j = 0,m = 0;;
char prech = 'a';
//去掉开头的空格
while(buf[i] == ' ')
i++;
while(buf[i] != '\0')
{
if (buf[i] == '\n' && prech != ' ')
{
out[j][m] = '\0';
//printf("%d %s\n",j,out[j]);
prech = ' ';
m = 0;
j++;
i++;
}else if(buf[i] == ' ' && prech != ' ')
{
out[j][m] = '\0';
//printf("%d %s\n",j,out[j]);
prech = ' ';
m = 0;
j++;
i++;
}else if (buf[i] == ' ' && prech == ' ')
{
i++;
}else
{
out[j][m] = buf[i];
prech = buf[i];
m++;
i++;
}
}
if (j== NMBKC+2)
{
return 1;
}else
return 0;
}
//读取文件
void ReadFile(struct Student stu[],int *nmb,char kecheng[][20])
{
int i = 0,j = 0;
char buf[100] = {0};
char tmp[NMBKC+2][20] = {0};
int t;
FILE* fp;
errno_t err;
if ((err = fopen_s(&fp,"a.txt","r")) != 0)
{
printf("文件读取失败\n");
return ;
}
//读取文件
//第一行数据
fgets(buf,100,fp);
//解析数据
ParserStr(buf,tmp); //解析出课程名称
for (j =0;j < NMBKC;j++)
{
strcpy_s(kecheng[j],20,tmp[j+2]);
}
while(!feof(fp))
{
memset(buf,0,100);
fgets(buf,100,fp); //读取一行
//避免最后一行直接结束
if(buf[strlen(buf)-1] != '\n')
buf[strlen(buf)] = ' ';
memset(tmp,0,sizeof(tmp));
if(ParserStr(buf,tmp))
{
stu[i].number = atoi(tmp[0]);
strcpy_s(stu[i].name,20,tmp[1]);
stu[i].avg = 0.0;
for(t = 0;t < NMBKC;t++)
{
stu[i].score[t] = atoi(tmp[2+t]);
stu[i].avg += stu[i].score[t];
}
stu[i].avg /= NMBKC;
i++;
}
}
fclose(fp);
*nmb = i;
//printf("总学生数:%d\n",i);
}
//按平均分排名
void SortByavg(struct Student stu[],int nmb,char kecheng[][20])
{
int i,j;
errno_t err;
struct Student tmp;
char* xh ="学号";
char* xm ="姓名";
char* pjf ="平均分";
char* pm="排名";
FILE* fp;
printf("%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
printf("%-10s",kecheng[i]);
printf("%-10s%-10s\n",pjf,pm);
for (i = 0;i< nmb-1;i++)
{
for (j = 0;j<nmb-1-i;j++)
{
if(stu[j].avg < stu[j+1].avg)
{
tmp = stu[j];
stu[j] = stu[j+1];
stu[j+1] = tmp;
}
}
}
//屏幕显示
j = 1;
for (i = 0;i<nmb;i++)
{
if (i == 0)
{
stu[i].mc = 1;
printf("%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,j);
}else
{
if(stu[i].avg != stu[i-1].avg)
j++;
stu[i].mc = j;
printf("%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,j);
}
}
//写文件
if ((err = fopen_s(&fp,"file2.txt","w")) != 0)
{
printf("文件打开失败\n");
return;
}
//屏幕显示
fprintf(fp,"%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
fprintf(fp,"%-10s",kecheng[i]);
fprintf(fp,"%-10s%-10s\n",pjf,pm);
j = 1;
for (i = 0;i<nmb;i++)
{
if (i == 0)
{
fprintf(fp,"%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,j);
}else
{
if(stu[i].avg != stu[i-1].avg)
j++;
fprintf(fp,"%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,j);
}
}
fclose(fp);
}
//按学号排名
void SortByxh(struct Student stu[],int nmb,char kecheng[][20])
{
int i,j;
struct Student tmp;
errno_t err;
char* xh ="学号";
char* xm ="姓名";
char* pjf ="平均分";
char* pm="排名";
FILE* fp;
//写文件
printf("%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
printf("%-10s",kecheng[i]);
printf("%-10s%-10s\n",pjf,pm);
for (i = 0;i< nmb-1;i++)
{
for (j = 0;j<nmb-1-i;j++)
{
if(stu[j].number > stu[j+1].number)
{
tmp = stu[j];
stu[j] = stu[j+1];
stu[j+1] = tmp;
}
}
}
//屏幕显示
for (i = 0;i<nmb;i++)
{
printf("%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,stu[i].mc);
}
//写文件
if ((err = fopen_s(&fp,"file1.txt","w")) != 0)
{
printf("文件打开失败\n");
return;
}
//写文件
fprintf(fp,"%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
fprintf(fp,"%-10s",kecheng[i]);
fprintf(fp,"%-10s%-10s\n",pjf,pm);
for (i = 0;i<nmb;i++)
{
fprintf(fp,"%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,stu[i].mc);
}
fclose(fp);
}
//统计每门课程的平均分
void TongjiKcpjf(struct Student stu[],int nmb,char kecheng[][20])
{
int i,j;
errno_t err;
FILE* fp;
float avg[NMBKC]; //保存每门课程的平均分
int a[5][NMBKC]; //保存每个分数段的数量
char* d0 = "分数段";
char* ds[] = {"<60","60-69","70-79","80-89",">=90"};
char* pjf = "平均分";
//计算课程平均分
for (i=0;i<NMBKC;i++)
{
avg[i] = 0.0;
for (j = 0;j< nmb;j++)
avg[i] += stu[j].score[i];
avg[i] /= nmb;
}
//初始化数量
for (i=0;i<5;i++)
{
for(j=0;j<NMBKC;j++)
a[i][j] = 0;
}
//统计各分数段数量
for (i=0;i<nmb;i++)
{
for(j=0;j<NMBKC;j++)
{
if(stu[i].score[j]< 60)
a[0][j] += 1;
else if(stu[i].score[j]>= 60 && stu[i].score[j]<= 69)
a[1][j] +=1;
else if(stu[i].score[j]>= 70 && stu[i].score[j]<= 79)
a[2][j] +=1;
else if(stu[i].score[j]>= 80 && stu[i].score[j]<= 89)
a[3][j] +=1;
else
a[4][j] +=1;
}
}
//打印
printf("%-6s ",d0);
for(i=0;i<NMBKC;i++)
printf("%-10s",kecheng[i]);
printf("\n");
for (i = 0;i< 5;i++)
{
printf("%-6s ",ds[i]);
for(j=0;j<NMBKC;j++)
printf("%-10d",a[i][j]);
printf("\n");
}
printf("%-6s ",pjf);
for (i=0;i<NMBKC;i++)
{
printf("%.2f ",avg[i]);
}
printf("\n");
//写文件
if ((err = fopen_s(&fp,"file3.txt","w")) != 0)
{
printf("文件打开失败\n");
return;
}
//写
fprintf(fp,"%-6s ",d0);
for(i=0;i<NMBKC;i++)
fprintf(fp,"%-10s",kecheng[i]);
fprintf(fp,"\n");
for (i = 0;i< 5;i++)
{
fprintf(fp,"%-6s ",ds[i]);
for(j=0;j<NMBKC;j++)
fprintf(fp,"%-10d",a[i][j]);
fprintf(fp,"\n");
}
fprintf(fp,"%-6s ",pjf);
for (i=0;i<NMBKC;i++)
{
fprintf(fp,"%.2f ",avg[i]);
}
fprintf(fp,"\n");
fclose(fp);
}
//打印成绩条
void DisplayCjt(struct Student stu[],int nmb,char kecheng[][20])
{
int i,j;
errno_t err;
struct Student tmp;
char* xh ="学号";
char* xm ="姓名";
char* pjf ="平均分";
char* pm="排名";
FILE* fp;
for (i = 0;i< nmb-1;i++)
{
for (j = 0;j<nmb-1-i;j++)
{
if(stu[j].number > stu[j+1].number)
{
tmp = stu[j];
stu[j] = stu[j+1];
stu[j+1] = tmp;
}
}
}
//屏幕显示
for (i = 0;i<nmb;i++)
{
printf("%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,stu[i].mc);
}
//写文件
if ((err = fopen_s(&fp,"file4.txt","w")) != 0)
{
printf("文件打开失败\n");
return;
}
//写文件
fprintf(fp,"%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
fprintf(fp,"%-10s",kecheng[i]);
fprintf(fp,"%-10s%-10s\n",pjf,pm);
for (i = 0;i<nmb;i++)
{
fprintf(fp,"%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,stu[i].mc);
}
fclose(fp);
}
//打印所有不及格信息
void DisplayBjg(struct Student stu[],int nmb,char kecheng[][20])
{
int i,j;
FILE* fp;
errno_t err;
int bw = 0;
char buf[100]={0};
char tmp[10];
if((err = fopen_s(&fp,"file5.txt","w")) != 0)
{
printf("文件打开失败\n");
return ;
}
for (i = 0;i< nmb;i++)
{
bw = 0;
memset(buf,0,100);
for (j = 0;j< NMBKC;j++)
{
if(stu[i].score[j]< 60)
{
memset(tmp,0,10);
strcat_s(buf,100,kecheng[j]);
strcat_s(buf,100,"(");
_itoa_s(stu[i].score[j],tmp,10,10);
strcat_s(buf,100,tmp);
strcat_s(buf,100,") ");
bw = 1;
}
}
if(bw)
{
printf("%d %s %s\n",stu[i].number,stu[i].name,buf);
fprintf(fp,"%d %s %s\n",stu[i].number,stu[i].name,buf);
}
}
fclose(fp);
}
//判断是否是优等生
int isYds(struct Student st)
{
int i;
int tt = 0;
int flag1 = 0,flag2 = 0,flag3 = 1;
if (st.avg > 90)
{
flag1 = 1;
}
for (i=0;i<NMBKC;i++)
{
if(st.score[i] == 100 && st.avg > 85)
flag1 = 1;
if(st.score[i] > 95)
tt++;
if(st.score[i]< 60)
flag3 = 0;
}
if(tt>=2 && st.avg > 85)
flag1 = 1;
if(st.mc <=3 )
flag2 = 1;
if (flag1 && flag2 && flag3)
{
return 1;
}
return 0;
}
//打印优等生
void DisplayYds(struct Student stu[],int nmb,char kecheng[][20])
{
int i;
errno_t err;
FILE* fp;
char* xh ="学号";
char* xm ="姓名";
char* pjf ="平均分";
char* pm="排名";
if((err = fopen_s(&fp,"file6.txt","w")) != 0)
{
printf("文件打开失败\n");
return ;
}
//终端输出
printf("%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
printf("%-10s",kecheng[i]);
printf("%-10s%-10s\n",pjf,pm);
//写文件
fprintf(fp,"%-6s%-8s",xh,xm);
for(i=0;i<NMBKC;i++)
fprintf(fp,"%-10s",kecheng[i]);
fprintf(fp,"%-10s%-10s\n",pjf,pm);
for (i=0;i<nmb;i++)
{
if(isYds(stu[i]))
{
printf("%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,stu[i].mc);
fprintf(fp,"%-6d%-10s%-10d%-10d%-10d%-10d%-10d%.2f%5d\n",stu[i].number,stu[i].name,stu[i].score[0],stu[i].score[1],stu[i].score[2],stu[i].score[3],stu[i].score[4],stu[i].avg,stu[i].mc);
}
}
fclose(fp);
}
int main()
{
struct Student stu[MAXNMB];
int nmb; //实际学生人数，从文件中读取
char kc[NMBKC][20] = {0}; //保存课程名称
//1.从文件中读取数据
printf("-------------------1.读入原始数据并显示---------------------\n");
ReadFile(stu,&nmb,kc);
Display(stu,nmb,kc);
//2.排序
printf("-------------------2.1根据平均分排序并显示------------------\n");
SortByavg(stu,nmb,kc); //现根据平均分排序
printf("-------------------2.2根据学号排序并显示--------------------\n");
SortByxh(stu,nmb,kc); //再根据学号排序，因为首选需要根据平均分排序才能得到名次
//3.统计课程平均分
printf("-------------------3.统计课程平均分并显示--------------------\n");
TongjiKcpjf(stu,nmb,kc);
//4.打印成绩条
printf("-------------------4.打印成绩条------------------------------\n");
DisplayCjt(stu,nmb,kc);
//5.打印不及格成绩
printf("-------------------5.打印不及格成绩---------------------------\n");
DisplayBjg(stu,nmb,kc);
//6.打印优等生
printf("-------------------6.打印优等生-------------------------------\n");
DisplayYds(stu,nmb,kc);
getchar();
getchar();
return 0;
}
望采纳
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