实验六

任务4

#include<stdio.h>
#include<stdlib.h>

int main(){
    FILE *fp;
    int count=0;
    fp=fopen("data4.txt","r");
    
    if(fp==NULL){
        printf("fail to open the file");
        return 1;
    }
    
    char ch;
    
    while((ch=fgetc(fp))!=EOF){
        if(ch!=' '&&ch!='\n'&&ch!='\t')
            count++;
    }
    fclose(fp);
    printf("data4.txt中共包含字符数（不计空白符）：%d",count);
    system("pause");
    return 0;
}

 

 任务5

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#pragma warning(disable:4996)
#define N 10

typedef struct {
    long int id;
    char name[20];
    float objective;   
    float subjective;  
    float sum;
    char level[10];
} STU;

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(<=40)，操作题得分(<=60)\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;
}
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);
}
void output(STU s[], int n) {
    FILE* fout;
    int i;
    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);
    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);
}
void process(STU s[], int n) {
    int i, j;
    STU t;
    for (i = 0; i < n; i++)
        s[i].sum = s[i].objective + s[i].subjective;
    for (j = 0; j < n; j++)
        for (i = 0; i < n - j - 1; i++)
        {
            if (s[i].sum < s[i + 1].sum)
            {
                t = s[i + 1];
                s[i + 1] = s[i];
                s[i] = t;
            }
        }
    for (i = 0; i < n; i++)
    {
        if (i < 0.1 * (n - 1))
            strcpy(s[i].level, "优秀");
        else if (i >= 0.1 * (n - 1) && i < 0.5 * (n - 1))
            strcpy(s[i].level, "合格");
        else if (i >= 0.5 * (n - 1))
            strcpy(s[i].level, "不合格");
    }
}

 

 任务6

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include<time.h>
#define N 80
#define M 5
typedef struct {
    long int id;
    char name[20];
    char class[30];
} STU;
void input(STU s[], int n);
void output(STU t[], int m);
int main() {
    STU stu[N];
    input( stu, N);
    int number, i, j = 0;
    STU lck[M];
    srand(time(0));
    for (i = 0; i < M; i++) {
        number = rand() % 80;
        lck[j] = stu[number];
        j++;
    }
    output(lck, M);
    return 0;
}
void input(STU s[], int n) {
    FILE* fp;
    int i, j;
    fp = fopen("list.txt", "r");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        exit(0);
    }
    for (i = 0; i < n; i++)
        fscanf(fp, "%ld %s %s", &s[i].id, s[i].name, s[i].class);
    fclose(fp);
}
void output(STU t[], int m) 
{
    int i, j = 0;
    for (i = 0; i < m; i++)
        printf("%ld\t%s\t%s\n", t[i].id, t[i].name, t[i].class);
    FILE* fout;
    fout = fopen("lucky.txt", "w");
    if (fout == NULL)
    {
        printf("fail to open or create result.txt\n");
        exit(0);
    }
    for (i = 0; i < m; i++)
        fprintf(fout,"%ld\t\t%s\t%s\n", t[i].id, t[i].name, t[i].class);
    fclose(fout);
}