作业6

#define _CRT_SECURE_NO_WARNINGS
#include<stdlib.h>
#include<stdio.h>
int main() {
    char ch;
    int count = 0;
    FILE* fp;
    fp = fopen("data4.txt", "r");
    if (fp == NULL)
    {
        printf("fail to open file");
        return 1;
    }
    ch = fgetc(fp);
    while (ch != EOF)
    {

        if (ch != ' ' && ch != '\n')
            count++;
        ch = fgetc(fp);
    }
    printf("data4.txt中共包含字符数（不计空白符）: %d", count);
    fclose(fp);
    system("pause");
    return 0;
}

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define N 10
typedef struct {
    long int id;
    char name[20];
    float objective; // 客观题得分
    float subjective; // 操作题得分
    float sum;
    char level[10];
} STU;
// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);
int main() {
    STU stu[N];
    printf("从文件读入%d个考生信息: 准考证号，姓名，客观题得分，操作题得分\n", N);
        input(stu, N);
    printf("\n对考生信息进行处理: 计算总分，确定等级\n");
    process(stu, N);
    printf("\n打印考生完整信息, 并保存到文件中");
    output(stu, N);
    return 0;
}
// 从文本文件examinee.txt读入考生信息:准考证号，姓名，客观题得分，操作题得分
void input(STU s[], int n) {
    int i;
    FILE* fin;
    fin = fopen("examinee.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }
    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name,
                &s[i].objective, &s[i].subjective);
    }
    fclose(fin);
}
// 输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
// 不仅输出到屏幕上，还写到文本文件result.txt中
void output(STU s[], int n) {
    FILE* fout;
    int i;
    // 输出到屏幕
    printf("\n");
    printf("准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,
            s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);
    // 保存到文件
    fout = fopen("result.txt", "w");
    if (!fout) {
        printf("fail to open or create result.txt\n");
        exit(0);
    }
    fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\n");
    for (i = 0; i < n; i++)
        fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,
            s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);
    fclose(fout);
}
// 对考生信息进行处理：计算总分，排序，确定等级
void process(STU s[], int n) {
    // 补足代码
    int i,z,p,a,b,k;
    STU t;
    for (i = 0; i < n; i++) {
        s[i].sum = (s[i].objective) * 0.4 + (s[i].subjective) * 0.6;
        
    }
    for (z = 0; z < n - 1; z++) {
        for (p = 0; p < n - 1; p++) {
            if (s[p].sum < s[p + 1].sum) {
                t = s[p];
                s[p] = s[p + 1];
                s[p + 1] = t;
            }
        }
    }
    a = n / 10;
    b = n / 2;
    for (k = 0; k < n; k++) {
        if ((k + 1) <= a) {
            strcpy(s[k].level, "优秀");
        }
        if ((k + 1)>a&&(k+1)<=b) {
            strcpy(s[k].level, "合格");
        }
        if ((k + 1) > b) {
            strcpy(s[k].level, "不合格");
        }
    }
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
typedef struct student
{
int number;
char name[20];
char Class[30];
}STU;
int main()
{
STU a[80];
int i, j;
FILE* fp;
fp = fopen("list.txt", "r");
if (fp == NULL)
{
printf("fail to open file\n");
return 1;
}
for (i = 0; i < 80; i++)
fscanf(fp, "%d %s%s", &a[i].number, a[i].name, a[i].Class);
fclose(fp);
fp = fopen("lucky.txt", "w");
for (i = 0; i < 5; i++)
{
j = rand() % 80;
printf("%d %s %s\n", a[j].number, a[j].name, a[j].Class);
fprintf(fp, "%d %s %s", a[j].number, a[j].name, a[j].Class);
fprintf(fp, "\n");
}
fclose(fp);
system("pause");
return 0;
}