#include #include #include #define m_l 10#define m_num 30#define m_cs 6typedef struct studentlong num ;char namem_l;float scorem_cs;float sum;float aver;STU;int menu(void);void Readscore(STU stu,int n,int m);void Aversumofeverystudent(STU stu,int n,int m);void Aversumofeverycourse(STU stu,int n,int m);void Sortbyscore(STU stu,int n,int m,int (*compare)(float a,float b);int Ascending(float a,float b);int Descending(float a,float b);void swapfloat(float *x,float *y);void swaplong(long *x,long *y);void swapchar(char x,char y);void Assortbynum(STU stu, int n, int m);void Sortbyname(STU stu, int n, int m);void Searchbynum(STU stu, int n, int m);void Searchbyname(STU stu, int n, int m);void StatisticAnlysis(STU stu, int n, int m);void Printscore(STU stu, int n, int m);void Writetofile(STU stu, int n, int m);void Readfromfile(STU stu, int *n, int *m);int main()char ch;int n=0,m=0;STU stum_num;printf(请输入学生人数(n=%d):n,m_num);scanf(%d,&n);printf(请输入课程数目(m=%d):n,m_cs);scanf(%d,&m);while(1)ch=menu(); switch(ch)case 1:Readscore(stu,n,m);break;case 2:Aversumofeverystudent(stu ,n,m);break;case 3:Aversumofeverycourse(stu ,n,m);break;case 4:Sortbyscore(stu ,n,m,Descending);printf(n 成绩降序排序n);Printscore( stu ,n, m);break;case 5:Sortbyscore(stu ,n,m,Ascending);printf(n 成绩升序排序n);Printscore( stu ,n, m);break;case 6:Assortbynum( stu , n, m);printf(n 学号升序排序n);Printscore( stu ,n, m);break;case 7:Sortbyname( stu , n, m);printf(n 姓名字典升序排序n);Printscore( stu ,n, m);break;case 8:Searchbynum( stu , n, m);break;case 9:Searchbyname( stu , n, m);break;case 10:StatisticAnlysis( stu , n, m);break;case 11:Printscore( stu ,n, m);break;case 12: Writetofile(stu,n,m);break;case 13:Readfromfile(stu,&n,&m);break;case 0:printf(n 欢迎下次继续使用);exit(0);default:printf(n 输入错误);return 0;int menu(void)int items;printf(欢迎使用学生成绩管理系统n);printf(1.输入成绩n);printf(2.计算各个学生总成绩和平均成绩n);printf(3.计算各门学科总成绩和平均成绩n);printf(4.成绩降序排序n);printf(5.成绩升序排序n);printf(6.学号升序排序n);printf(7.姓名升序排序n);printf(8.通过学号查找成绩n);printf(9.通过姓名查找成绩n);printf(10.标准分析n);printf(11.显示成绩n);printf(12.写入文件n);printf(13.读取文件n);printf(0.退出n);printf(请做出您的选择n);scanf(%d,&items);return items;void Readscore(STU stu,int n,int m)int i,j;printf(请输入学生学号，姓名，成绩n);for(i=0;in;i+)scanf(%ld%s,&stui.num,stui.name); stui.sum=0;for(j=0;j0)stui.aver= m0 ? stui.sum/m : -1;void Aversumofeverystudent(STU stu,int n,int m)int i,j;for(i=0;in;i+)printf(学生 %d：总成绩： %.1f，平均成绩： %.1fn,i+1,stui.sum,stui.aver);void Aversumofeverycourse(STU stu,int n,int m)int i,j;float summ_cs,averm_cs;for(i=0;im;i+)sumi=0;for(j=0;j0?sumi/n:-1;printf(课程 %d：总成绩： %.1f，平均成绩： %.1fn,i+1,sumi,averi);void Sortbyscore(STU stu,int n,int m,int (*compare)(float a,float b)int i,j,k,t;for(i=0;in-1;i+)k=i;for(j=i+1;jn;j+)if(*compare)(stuj.sum,stuk.sum)k=j; if(k!=i)for(t=0;tm;t+)swapfloat(&stuk.scoret,&stui.scoret);swapfloat(&stuk.sum,&stui.sum);swapfloat(&stuk.aver,&stui.aver);swaplong(&stuk.num,&stui.num);swapchar(stuk.name,stui.name);int Ascending(float a,float b)return ab;void swapfloat(float *x,float *y)float b;b=*x;*x=*y;*y=b;void swaplong(long *x,long *y)long b;b=*x;*x=*y;*y=b;void swapchar(char x,char y)char bm_l;strcpy(b,x);strcpy(x,y);strcpy(y,b);void Assortbynum(STU stu, int n, int m) int i,j,k,t;for(i=0;in-1;i+)k=i;for(j=i+1;jn;j+)if(stuj.numstuk.num)k=j;if(k!=i)for(t=0;tm;t+)swapfloat(&stuk.scoret,&stui.scoret);swapfloat(&stuk.sum,&stui.sum);swapfloat(&stuk.aver,&stui.aver);swaplong(&stuk.num,&stui.num);swapchar(stuk.name,stui.name);void Sortbyname(STU stu, int n, int m)int i,j,t;for(i=0;in-1;i+)for(j=i+1;jn;j+)if(strcmp(stuj.name,stui.name)0)for(t=0;tm;t+)swapfloat(&stui.scoret,&stuj.scoret);swapfloat(&stuj.sum,&stui.sum);swapfloat(&stuj.aver,&stui.aver);swaplong(&stuj.num,&stui.num);swapchar(stuj.name,stui.name);void Searchbynum(STU stu, int n, int m) long num;int i,j;printf(输入你所想要查找的学号n);scanf(%ld,&num);for(i=0;in;i+)if(stui.num=num)printf(%