设计一个学生信息管理系统
的有关信息介绍如下：
#include #include #include #define MAX 1000 /*定义学生成绩信息结构*/ struct stu { char id[8]; char name[8]; double Chinese; double Math; double English; double average; double total; }; /*学生结构数组，用于存储学生成绩信息*/ struct stu students[MAX]; /*当前学生人数*/ int current; void input() { int i; printf("请输入学生人数："); scanf("%d", & current); for (i = 0; i < current; i++) { printf("\n请输入学生学号，最多为7位数: "); scanf("%s", students[i].id); printf("请输入学生姓名："); scanf("%s", students[i].name); printf("请输入语文成绩："); scanf("%lf", &students[i].Chinese); printf("请输入数学成绩："); scanf("%lf", &students[i].Math); printf("请输入英语成绩："); scanf("%lf", &students[i].English); students[i].total = students[i].Chinese + students[i].Math + students[i].English; students[i].average = students[i].total / 3; } } /*排名次，即对学生结构数组排序*/ void sort(struct stu array[], int n) { int i, j; struct stu temp; for (i = 0; i < n; i++) { for (j = i+1; j < n; j++) { if (array[i].average - array[j].average < 1e-16) { temp = array[i]; array[i] = array[j]; array[j] = temp; } } } } /*统计平均成绩，并输出各分数段的人数*/ void print_score(struct stu array[], int n) { int i; double ave = 0; int sum1 = 0, sum2 = 0, sum3 = 0, sum4 = 0; for (i = 0; i < n; i++) { ave += array[i].average; switch ((int)(array[i].average / 10)) { case 10: case 9: sum1++; break; case 8: sum2++; break; case 7: case 6: sum3++; break; default: sum4++; } } printf("全班的平均分为：%.1f\n", ave/n); printf("平均分在90分以上的人数为：%d\n", sum1); printf("平均分在80~89的人数为：%d\n", sum2); printf("平均分在60~79的人数为：%d\n", sum3); printf("平均分在60分以下的人数为：%d\n", sum4); } /*输出不及格科目及学生名单*/ void print_unreach(struct stu array[], int n) { int i; printf("科目\t学号\t名字\n"); for (i = 0; i < n; i++) { if (array[i].Chinese < 60) { printf("语文\t%s\t%s\n", array[i].id, array[i].name); } if (array[i].Math < 60) { printf("数学\t%s\t%s\n", array[i].id, array[i].name); } if (array[i].English 60) { printf("英语\t%s\t%s\n", array[i].id, array[i].name); } } } /*打印优等生名单*/ void print_good(struct stu array[], int n) { int i; char mark = 0; if (n > 3) { n = 3; } printf("学号\t姓名\t语文\t数学\t英语\t平均分\t名次\n"); for (i = 0; i n; i++) { if ((array[i].Chinese > 60) && (array[i].Math > 60) && (array[i].English > 60)) { if (array[i].average > 90) mark = 1; else if (array[i].average > 85) { if (array[i].Chinese == 100) mark = 1; if (array[i].Math == 100) mark = 1; if (array[i].English == 100) mark = 1; if (array[i].Chinese > 95 && array[i].English > 95) mark = 1; if (array[i].Chinese > 95 && array[i].Math > 95) mark = 1; if (array[i].Math > 95 && array[i].English > 95) mark = 1; } if (mark == 1) { printf("%s\t%s\t", array[i].id, array[i].name); printf("%.f\t%.f\t%.f\t%.1f\t", array[i].Chinese, array[i].Math, array[i].English, array[i].average); printf("%d\n", i+1); } } } } /*按学生姓名查询成绩*/ void search_name(struct stu array[], int n, char* name) { int i; char mark = 1; for (i = 0; i < n; i++) { if (strcmp(name, array[i].name) == 0) { printf("学生姓名：%s\n", name); printf("学生学号：%s\n", array[i].id); printf("语文：%.f\n", array[i].Chinese); printf("数学：%.f\n", array[i].Math); printf("英语：%.f\n", array[i].English); printf("平均分：%.1f\n", array[i].average); mark = 0; } } if (mark == 1) puts("不存在该学生记录"); } /*按学生学号查询成绩*/ void search_id(struct stu array[], int n, char* id) { int i; char mark = 1; for (i = 0; i < n; i++) { if (strcmp(id, array[i].id) == 0) { printf("学生姓名：%s\n", array[i].name); printf("学生学号：%s\n", array[i].id); printf("语文：%.f\n", array[i].Chinese); printf("数学：%.f\n", array[i].Math); printf("英语：%.f\n", array[i].English); printf("平均分：%.1f\n", array[i].average); mark = 0; break; } } if (mark == 1) puts("不存在该学生记录"); } void print_menu() { system("cls"); printf("1.输入学生信息\n"); puts("2.统计全班学生成绩"); puts("3.按学号查询学生成绩"); puts("4.按姓名查询学生成绩"); puts("5.输出不及格情况"); puts("6.输出优等生名单"); puts("0.退出本程序"); printf("\n\n 请输入你的选择："); } int main(int argc, char **argv) { char ch = 0; char id[8], name[8]; while (ch != '0') { print_menu(); ch = getchar(); switch (ch) { case '1': { system("cls"); input(); sort(students, current); break; } case '2': { system("cls"); print_score(students, current); break; } case '3': { system("cls"); printf("请输入学号："); scanf("%s", id); search_id(students, current, id); break; } case '4': { system("cls"); printf("请输入姓名："); scanf("%s", name); search_name(students, current, name); break; } case '5': { system("cls"); print_unreach(students, current); break; } case '6': { system("cls"); print_good(students, current); break; } case '0': exit(0); } printf("\n\n按任意键返回主菜单……"); getchar(); getchar(); } return 0; }
