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C++程序解释一下请详细点啊谢谢啊这是关于学生成绩管理输入学生成

发表于：2024-10-24 00:00:00浏览：15次分类：电脑/网络-程序设计-C/C++

问题描述：请详细点啊谢谢啊这是关于成绩管理输入学生成绩输出最低分最高分平均分及一定分数段的所占的比例.. 一定详细啊 #include <stdio.h> #include <string.h> #include <stdlib.h> #define NULL 0 #define SIZE sizeof(struct student) struct student { int num; char name[10]; int age; char addr[15]; 请详细点啊谢谢啊这是关于成绩管理输入学生成绩输出最低分最高分平均分及一定分数段的所占的比例.. 一定详细啊 #include <stdio.h> #include <string.h> #include <stdlib.h> #define NULL 0 #define SIZE sizeof(struct student) struct student { int num; char name[10]; int age; char addr[15]; float score[3]; float zf,pjf; struct student *next; }; struct student *head=NULL,*tail=NULL; int n=0; void load(); void save(); void add(); void input(struct student *p); void list(); void main() { int ch; int loop=1; while(loop) { printf("\n\n"); printf("========== main menu ============\n"); printf(" 1---load\n"); printf(" 2---save\n"); printf(" 3---add\n"); printf(" 4---insert\n"); printf(" 5---delete\n"); printf(" 6---update\n"); printf(" 7---locate\n"); printf(" 8---list\n"); printf(" 9---calc\n"); printf(" 10---sort\n"); printf(" 11---tj\n"); printf(" 0---quit\n"); printf("=================================\n"); printf("input your choice:"); scanf("%d",&ch); getchar(); switch(ch) { case 1: load(); break; case 2: save(); break; case 3: add(); break; case 4: case 5: case 6: case 7: case 8: list(); break; case 9: case 10: case 0: loop=0; break; default: printf("input choice error!"); } } } void load() { FILE *fp; struct student *p1,*p2; int i; if ((fp=fopen("stu.dat","rb"))==NULL) { printf("cannot open file!\n"); return; } p2=tail; while(1) { p1=(struct student *)malloc(SIZE); if (p1==NULL) { printf("malloc failed!\n"); break; } if (fread(p1,SIZE,1,fp)!=1) break; n++; if (n==1) head=p1; else p2->next=p1; p2=p1; } fclose(fp); p2->next=NULL; tail=p2; } void save() { FILE *fp; struct student *p; if ((fp=fopen("stu.dat","wb"))==NULL) { printf("cannot open file!\n"); return; } p=head; while(p!=NULL) { if (fwrite(p,SIZE,1,fp)!=1) { printf("file write error!\n"); break; } p=p->next; } fclose(fp); } void add() { struct student *p1,*p2; int i; p2=tail; p1=(struct student *)malloc(SIZE); if (p1==NULL) { printf("malloc failed!\n"); return; } input(p1); while(p1->num!=0) { n++; if (n==1) head=p1; else p2->next=p1; p2=p1; p1=(struct student *)malloc(SIZE); input(p1); } p2->next=NULL; tail=p2; } void input(struct student *p) { int i; printf("\n"); printf("num: "); scanf("%d",&p->num); getchar(); if (p->num==0) return; printf("name: "); gets(p->name); printf("age: "); scanf("%d",&p->age); getchar(); printf("addr: "); gets(p->addr); printf("three scores: "); for(i=0;i<3;i++) scanf("%f",&(p->score[i])); p->zf=0; p->pjf=0; } void list() { struct student *p; int i; p=head; i=1; printf(" mnameageaddrywsxyyzfpjf\n"); printf("----------------------------------------------------------------------\n"); while (p!=NULL) { printf("%2d %5d %-10s %3d %-10s %7.2f %7.2f %7.2f %7.2f %7.2f\n",i,p->num,p->name, p->age,p->addr,p->score[0],p->score[1],p->score[2], p->zf,p->pjf); p=p->next; i++; } }

#include #include #include #define NULL 0 /*定义常量*/ #define SIZE sizeof(struct student) /*定义SIZE sizeof函数*/ struct student { int num; char name[10]; int age; char addr[15]; float score[3]; float zf,pjf; struct student *next; }; /*构造student的数据类型*/ struct student *head=NULL,*tail=NULL; /*定义开头，结尾数值为空*/ int n=0; void load(); void save(); void add(); void input(struct student *p); void list(); /*调用一大串函数load*/ void main() { int ch; int loop=1; while(loop) { printf("\n\n"); printf("========== main menu ============\n"); printf(" 1---load\n"); printf(" 2---save\n"); printf(" 3---add\n"); printf(" 4---insert\n"); printf(" 5---delete\n"); printf(" 6---update\n"); printf(" 7---locate\n"); printf(" 8---list\n"); printf(" 9---calc\n"); printf(" 10---sort\n"); printf(" 11---tj\n"); printf(" 0---quit\n"); printf("=================================\n"); /*打印主菜单*/ printf("input your choice:"); /*提示输入操作*/ scanf("%d",&ch); getchar(); /*读取输入命令*/ switch(ch) { case 1: load(); break; case 2: save(); break; case 3: add(); break; case 4: case 5: case 6: case 7: case 8: list(); break; case 9: case 10: case 0: loop=0; break; default: /*switch语句做判断*/ printf("input choice error!"); } /*提示错误*/ } } void load() /*load函数*/ { FILE *fp; struct student *p1,*p2; int i; /*定义文件以及文件指针*/ if ((fp=fopen("stu.dat","rb"))==NULL) { printf("cannot open file!\n"); return; } p2=tail; while(1) { p1=(struct student *)malloc(SIZE); if (p1==NULL) { printf("malloc failed!\n"); break; } if (fread(p1,SIZE,1,fp)!=1) break; n++; if (n==1) head=p1; else p2->next=p1; p2=p1; } fclose(fp); p2->next=NULL; tail=p2; } void save() { FILE *fp; struct student *p; if ((fp=fopen("stu.dat","wb"))==NULL) { printf("cannot open file!\n"); return; } p=head; while(p!=NULL) { if (fwrite(p,SIZE,1,fp)!=1) { printf("file write error!\n"); break; } p=p->next; } fclose(fp); } void add() { struct student *p1,*p2; int i; p2=tail; p1=(struct student *)malloc(SIZE); if (p1==NULL) { printf("malloc failed!\n"); return; } input(p1); while(p1->num!=0) { n++; if (n==1) head=p1; else p2->next=p1; p2=p1; /*将指针p1的指向赋给p2*/ p1=(struct student *)malloc(SIZE); input(p1); /*定义p1的指向*/ } p2->next=NULL; tail=p2; /*文件尾部指向p2*/ } void input(struct student *p) { int i; printf("\n"); printf("num: "); scanf("%d",&p->num); getchar(); if (p->num==0) return; printf("name: "); gets(p->name); printf("age: "); scanf("%d",&p->age); getchar(); printf("addr: "); gets(p->addr); printf("three scores: "); for(i=0;i<3;i++) scanf("%f",&(p->score[i])); p->zf=0; p->pjf=0; } void list() { struct student *p; /*指针指向 student*/ int i; p=head; /*指针指向文件开头 */ i=1; printf(" mnameageaddrywsxyyzfpjf\n");printf("----------------------------------------------------------------------\n"); while (p!=NULL) { printf("%2d %5d %-10s %3d %-10s %7.2f %7.2f %7.2f %7.2f %7.2f\n",i,p->num,p->name, p->age,p->addr,p->score[0],p->score[1],p->score[2], p->zf,p->pjf); /*输出文件中对应的学号，姓名，年龄，地址，最低分，最高分，平均分*/ p=p->next; i++; } }