C语言大作业——学生成绩管理系统v2.0.doc
/成绩管理系统v2.0#include <stdio.h>#include <stdlib.h>#define N 30void Input (long num,int score,int n);void Totalave (int score,int n);void Scoredes (long num,int score,int n,int (*compare)(int a,int b);int Ascending (int a,int b);void Numas (long num,int score,int n);void Search (long num,int score,int n,int x);void statistis (long num,int score,int n);void List (long num,int score,int n);int main() int n,scoreN,c,x,i; long numN; printf("输入学生人数"); scanf("%d",&n); printf("1.Input recordn"); printf("2.Caculate totel and average score of coursen"); printf("3.Sort in descending order by scoren"); printf("4.Sort in ascending order by numbern"); printf("5.Search by numbern"); printf("6.Statistic analysisn"); printf("7.List recordn"); printf("0.Exitn"); printf("Please enter your choice:n"); printf("n"); for(;) scanf("%d",&c); switch(c) case 1: Input (num,score,n); printf("Please enter your choice:n"); break; case 2: Totalave (score,n); printf("Please enter your choice:n"); break; case 3: Scoredes (num,score,n,Ascending); for(i=0;i<n;i+) printf("ID:%10ld,score:%dn",numi,scorei);/以长整形打印用%ld printf("Please enter your choice:n"); break; case 4: Numas (num,score,n); printf("Please enter your choice:n"); break; case 5: printf("请输入查找学号n"); scanf("%d",&x); Search (num,score,n,x); printf("Please enter your choice:n"); break; case 6: statistis (num,score,n); printf("Please enter your choice:n"); break; case 7: List (num,score,n); Totalave (score,n); printf("Please enter your choice:n"); break; case 0: exit(0); return 0;void Input (long num,int score,int n) int i; for(i=0;i<n;i+) printf("Input students ID and score"); scanf("%ld%d",&numi,&scorei); void Totalave (int score,int n) int i,sum=0; double ave; for(i=0;i<n;i+) sum=sum+scorei; ave=(double)sum/n; printf("Caculate total=%d,average score of course=%fn",sum,ave);void Scoredes (long num,int score,int n,int(*compare)(int a,int b) int i,j,k,t,h; for(i=0;i<n;i+) k=i; for(j=i+1;j<n;j+) if (*compare)(scorej,scorek) k=j; if(i!=k) t=scorek,h=numk; scorek=scorei,numk=numi; scorei=t,numi=h; int Ascending (int a,int b) return a<b;void Numas (long num,int score,int n) int i,j,k,t,h; for(i=0;i<n;i+) k=i; for(j=i+1;j<n;j+) if (numj<numk) k=j; if(i!=k) t=scorek,h=numk; scorek=scorei,numk=numi; scorei=t,numi=h; for(i=0;i<n;i+) printf("ID:%10ld,score:%dn",numi,scorei);/以长整形打印用%ldvoid Search (long num,int score,int n,int x) int high=n-1,low=0,mid,c=0,pos,find=0,i,j,k,t,h; for(i=0;i<n;i+) k=i; for(j=i+1;j<n;j+) if (numj<numk) k=j; if(i!=k) t=scorek,h=numk; scorek=scorei,numk=numi; scorei=t,numi=h; while(find=0&&low<=high) mid=(high+low)/2; if(x>nummid) low=mid+1; else if(x<nummid) high=mid-1; else pos=mid; find=1; if(find=0) printf("not findn"); else for(i=0;i<n;i+) if(scorei>scorepos) c+; printf("ID:%10ld，order:%d,score:%dn",numpos,c+1,scorepos); void statistis (long num,int score,int n) int a=0,b=0,c=0,d=0,e=0,i; double A,B,C,D,E; for(i=0;i<n;i+) if(scorei>=90) a+; else if(scorei>=80) b+; else if(scorei>=70) c+; else if(scorei>=60) d+; else e+; A=(double)a/n*100; B=(double)b/n*100; C=(double)c/n*100; D=(double)d/n*100; E=(double)e/n*100; printf("优秀人数%d,百分比:%f%n",a,A); printf("良好人数%d,百分比:%f%n",b,B); printf("中等人数%d,百分比:%f%n",c,C); printf("及格人数%d,百分比:%f%n",d,D); printf("不及格人数%d,百分比:%f%n",e,E);void List (long num,int score,int n) int i; for(i=0;i<n;i+) printf("ID:%10ld,score:%dn",numi,scorei);
