实验5

#include <stdio.h>
#define N 5
#define M 80
 
typedef struct {
    char name[M]; // 书名
    char author[M]; // 作者
} Book;
 
int main() {
    Book x[N] = { {"一九八四", "乔治.奥威尔"},
        {"美丽新世界", "赫胥黎"},
        {"昨日的世界", "斯蒂芬.茨威格"},
        {"万历十五年", "黄仁宇"},
        {"一只特立独行的猪", "王小波"}
    };
    int i;
    FILE *fp;
    fp = fopen("data1.txt", "w");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; ++i) {
        fprintf(fp, "%-20s %-20s\n", x[i].name, x[i].author);
        printf("%-20s %-20s\n", x[i].name, x[i].author);
    }
    fclose(fp);
    return 0;
}

#include <stdio.h>
#define N 5
#define M 80
 
typedef struct {
    char name[M];
    char author[M];
} Book;
 
int main() {
    Book x[N];
    int i;
    FILE *fp;
    fp = fopen("data1.txt", "r");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; ++i) {
        fscanf(fp, "%s %s\n", x[i].name, x[i].author);
        printf("%-20s %-20s\n", x[i].name, x[i].author);
    }
    fclose(fp);
    return 0;
}

x[i].name和x[i].author都是字符串，他们的地址就是本身

#include <stdio.h>
#define N 5
#define M 80
 
typedef struct {
    char name[M];
    char author[M];
} Book;
 
int main() {
    Book x[N] = { {"一九八四", "乔治.奥威尔"},
        {"美丽新世界", "赫胥黎"},
        {"昨日的世界", "斯蒂芬.茨威格"},
        {"万历十五年", "黄仁宇"},
        {"一只特立独行的猪", "王小波"}
    };
    int i;
    FILE *fp;
    fp = fopen("data2.dat", "wb");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    fwrite(x, sizeof(Book), N, fp);
    fclose(fp);
    return 0;
}

#include <stdio.h>
#define N 5
#define M 80
 
typedef struct {
    char name[M];
    char author[M];
} Book;
 
int main() {
    Book x[N];
    int i;
    FILE *fp;
    fp = fopen("data2.dat", "rb");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    fread(x, sizeof(Book), N, fp);
    for (i = 0; i < N; ++i)
        printf("%-20s%-20s\n", x[i].name, x[i].author);
    fclose(fp);
    return 0;
}

#include <stdio.h>
 
int main() {
    FILE *fin, *fout;
    char ch;
    fin = fopen("data3_1.txt", "r");
    if (fin == NULL) {
        printf("fail to open data3_1.txt\n");
        return 1;
    }
    fout = fopen("data3_2.txt", "w");
    if (fout == NULL) {
        printf("fail to open data3_2.txt\n");
        return 1;
    }
    while ( !feof(fin) ) {
        ch = fgetc(fin);
        if (ch >= 'a' && ch <= 'z')
            ch -= 32;
        fputc(ch, fout);
    }
    fclose(fin);
    fclose(fout);
    return 0;
}

#include <stdio.h>
 
int main() {
    int i, num = 0;
    char ch;
    FILE *fin;
    fin = fopen("data3_1.txt", "r");
 
    if (fin == NULL) {
        printf("fail to open data3_1.txt\n");
        return 1;
    }
 
    while (!feof(fin)) {
        ch = fgetc(fin);
        if (ch != ' ' && ch != '\t' && ch != '\n' && ch != EOF)
            num = num + 1;
    }
    fclose(fin);
 
    printf("data3_1.txt中共包含字符数：%d个", num);
 
    return 0;
}

#include <stdio.h>
#define N 5
 
typedef struct {
    long no;
    char name[20];
    int score;
} STU;
int findMinlist(STU s[], int n, STU t[]);
 
int main() {
    STU stu[N], minlist[N];
    int count, i;
    FILE *fin, *fout;
    fin = fopen("data4_1.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; ++i) {
        fscanf(fin, "%ld %s %d", &stu[i].no, stu[i].name, &stu[i].score);
        printf("%ld %s %d\n", stu[i].no, stu[i].name, stu[i].score);
    }
    fclose(fin);
    count = findMinlist(stu, N, minlist);
    printf("\n一共有%d个最低分，信息如下: \n", count);
    for (i = 0; i < count; ++i)
        printf("%ld %s %d\n", minlist[i].no, minlist[i].name,
               minlist[i].score);
    fout = fopen("data4_2.txt", "w");
    if (fout == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < count; ++i)
        fprintf(fout, "%ld %s %d\n", minlist[i].no, minlist[i].name,
                minlist[i].score);
    fclose(fout);
    return 0;
}
 
int findMinlist(STU s[], int n, STU t[]) {
    int i, k, min_score;
    min_score = s[0].score;
    for (i = 1; i < n; ++i)
        if (s[i].score < min_score)
            min_score = s[i].score;
    k = 0;
    for (i = 0; i < n; ++i)
        if (s[i].score == min_score) {
            t[k] = s[i];
            ++k;
        }
    return k;
}

#include <stdio.h>
#define N 5
 
typedef struct {
    long no;
    char name[20];
    int score;
} STU;
int findMinlist(STU s[], int n, STU t[]);
 
int main() {
    STU stu[N], minlist[N];
    int count, i;
    FILE *fin, *fout;
    fin = fopen("data4_1.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; ++i) {
        fscanf(fin, "%ld %s %d", &stu[i].no, stu[i].name, &stu[i].score);
        printf("%ld %s %d\n", stu[i].no, stu[i].name, stu[i].score);
    }
    fclose(fin);
    count = findMinlist(stu, N, minlist);
    printf("\n一共有%d个最低分，信息如下: \n", count);
    for (i = 0; i < count; ++i)
        printf("%ld %s %d\n", minlist[i].no, minlist[i].name,
               minlist[i].score);
    fout = fopen("data4_2.txt", "w");
    if (fout == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < count; ++i)
        fprintf(fout, "%ld %s %d\n", minlist[i].no, minlist[i].name,
                minlist[i].score);
    fclose(fout);
    return 0;
}
 
int findMinlist(STU s[], int n, STU t[]) {
    int i, k, min_score;
    min_score = s[0].score;
    for (i = 1; i < n; ++i)
        if (s[i].score < min_score)
            min_score = s[i].score;
    k = 0;
    for (i = 0; i < n; ++i)
        if (s[i].score == min_score) {
            t[k] = s[i];
            ++k;
        }
    return k;
}

//task5
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#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)
{
    FILE *fp;
    STU *ss;
    int max,i,j;
    int no[10];
    
    
    for(i=0;i<n;i++)
    {
        s[i].sum=s[i].objective+s[i].subjective;
        
    }
    
    for(i=0;i<n;i++)
    {
        for(j=0;j<n-1-i;j++)
        {
            if(s[j].sum<s[j+1].sum)
            {
                *ss=s[j];
                s[j]=s[j+1];
                s[j+1]=*ss;
            }
        }
    }
    strcpy(s[0].level,"优秀"); 
    for(i=1;i<n;i++)
        switch(i<=4)
        {
            case 1:strcpy(s[i].level,"合格");break;
            case 0:strcpy(s[i].level,"不合格"); break;
        }  
}

posted @ 2022-06-06 22:51 xf461 阅读(17) 评论(2) 收藏举报

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