parent
d24cf6a1f5
commit
3de285a9c6
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAX_STUDENT_NUM 100
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struct Student {
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char* id;
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char* clas;
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char* name;
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double score1;
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double score2;
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double score3;
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double score;
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};
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struct Student stu[MAX_STUDENT_NUM];
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int stu_num = 0;
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void print_menu() {
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printf("1.input\n");
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printf("2.delete\n");
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printf("3.select\n");
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printf("4.order\n");
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printf("5.output\n");
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printf("6.quit\n");
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printf("please input your option\n");
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}
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void add_student() {
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while (1) {
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printf("Id ");
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stu[stu_num].id = (char*)malloc(sizeof(char) * 20);
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scanf("%s", stu[stu_num].id);
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printf("class ");
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stu[stu_num].clas = (char*)malloc(sizeof(char) * 20);
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scanf("%s", stu[stu_num].clas);
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printf("name ");
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stu[stu_num].name = (char*)malloc(sizeof(char) * 20);
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scanf("%s", stu[stu_num].name);
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printf("score1 ");
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scanf("%lf", &stu[stu_num].score1);
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printf("score2 ");
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scanf("%lf", &stu[stu_num].score2);
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printf("score3 ");
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scanf("%lf", &stu[stu_num].score3);
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stu[stu_num].score = stu[stu_num].score1 + stu[stu_num].score2 + stu[stu_num].score3;
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stu_num++;
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printf("continue? ");
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char answer[10];
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scanf("%s", answer);
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if (strcmp(answer, "no") == 0) {
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break;
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}
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}
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}
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void delete_student() {
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int i, j;
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while (1) {
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printf("input student id or name to delete\n");
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char query[20];
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scanf("%s", query);
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int deleted = 0;
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for (i = 0; i < stu_num; i++) {
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if (strcmp(query, stu[i].id) == 0 || strcmp(query, stu[i].name) == 0) {
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free(stu[i].id);
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free(stu[i].clas);
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free(stu[i].name);
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for (j = i; j < stu_num - 1; j++) {
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stu[j] = stu[j + 1];
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}
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stu_num--;
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deleted = 1;
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i--;
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}
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}
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if (!deleted) {
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printf("no such student\n");
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}
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else {
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for (i = 0; i < stu_num; i++) {
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printf("%s,%s,%s,%.1lf,%.1lf,%.1lf,%.1lf\n", stu[i].id, stu[i].clas, stu[i].name, stu[i].score1, stu[i].score2, stu[i].score3, stu[i].score);
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}
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}
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printf("continue? ");
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char answer[10];
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scanf("%s", answer);
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if (strcmp(answer, "no") == 0) {
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break;
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}
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}
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}
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void select_student() {
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int i;
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while (1) {
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printf("input student id or class to select\n");
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char query[20];
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scanf("%s", query);
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double sum_score1 = 0.0, sum_score2 = 0.0, sum_score3 = 0.0, sum_score = 0.0;
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int count = 0;
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for (i = 0; i < stu_num; i++) {
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if (strcmp(query, stu[i].id) == 0 || strcmp(query, stu[i].clas) == 0) {
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sum_score1 += stu[i].score1;
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sum_score2 += stu[i].score2;
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sum_score3 += stu[i].score3;
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sum_score += stu[i].score;
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count++;
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}
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}
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if (count == 0) {
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printf("no such student\n");
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}
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else {
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printf("average score1: %.1lf\n", sum_score1 / count);
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printf("average score2: %.1lf\n", sum_score2 / count);
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printf("average score3: %.1lf\n", sum_score3 / count);
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printf("average score: %.1lf\n", sum_score / count);
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}
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printf("continue? ");
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char answer[10];
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scanf("%s", answer);
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if (strcmp(answer, "no") == 0) {
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break;
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}
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}
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}
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void order_student() {
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int i, j;
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while (1) {
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printf("input 1 to order by id or 2 to order by score\n");
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int order_type;
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scanf("%d", &order_type);
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if (order_type != 1 && order_type != 2) {
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printf("invalid order type\n");
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continue;
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}
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for (i = 0; i < stu_num; i++) {
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for (j = i + 1; j < stu_num; j++) {
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if ((order_type == 1 && strcmp(stu[i].id, stu[j].id) > 0) ||
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(order_type == 2 && stu[i].score < stu[j].score)) {
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struct Student temp = stu[i];
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stu[i] = stu[j];
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stu[j] = temp;
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}
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}
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}
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for (i = 0; i < stu_num; i++) {
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printf("%s,%s,%s,%.1lf,%.1lf,%.1lf,%.1lf\n", stu[i].id, stu[i].clas, stu[i].name, stu[i].score1, stu[i].score2, stu[i].score3, stu[i].score);
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}
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printf("continue? ");
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char answer[10];
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scanf("%s", answer);
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if (strcmp(answer, "no") == 0) {
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break;
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}
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}
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}
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void output_student() {
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int i;
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for (i = 0; i < stu_num; i++) {
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printf("%s,%s,%s,%.1lf,%.1lf,%.1lf,%.1lf\n", stu[i].id, stu[i].clas, stu[i].name, stu[i].score1, stu[i].score2, stu[i].score3, stu[i].score);
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}
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}
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int main() {
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while (1) {
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print_menu();
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int option;
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scanf("%d", &option);
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switch (option) {
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case 1:
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add_student();
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break;
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case 2:
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delete_student();
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break;
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case 3:
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select_student();
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break;
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case 4:
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order_student();
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break;
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case 5:
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output_student();
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break;
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case 6:
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printf("goodbye!\n");
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exit(0);
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default:
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printf("invalid option\n");
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break;
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}
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}
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return 0;
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}
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