实验7

实验任务1

代码：

#include <stdlib.h>
#include <stdio.h>
#define N 7
#define M 80

typedef struct {
    char name[M];
    char author[M];
}Book;

int main() {
    Book x[N]={{"《雕塑家》","斯科特.麦克劳德"},
               {"《灯塔》","克里斯多夫.夏布特"},
               {"《五号屠宰场》","库尔特.冯内古特"},
               {"《出卖月亮的人》","罗伯特.海因莱茵"},
               {"《大地之上》","罗欣顿.米斯特里"},
               {"《上学记》","何兆武"},
               {"《命运》","蔡崇达"}};

    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);

    system("pause");

    return 0;
}

#include <stdlib.h>
#include <stdio.h>
#define N 7
#define M 80

typedef struct {
    char name[M];
    char author[M];
}Book;

int main() {
    Book x[N];

    int i,n;

    FILE *fp;

    fp=fopen("data1.txt","r");

    if(fp == NULL){
        printf("fail to open file\n");
        return 1;
    }

    i=0;
    while(!feof(fp)){
        fscanf(fp,"%s%s",x[i].name,x[i].author);
        ++i;
    }
    n=i-1;

    for(i=0;i<n;++i)
        printf("%d.%-20s%-20s\n",i+1,x[i].name,x[i].author);

    fclose(fp);

    system("pause");

    return 0;
}

截图：

 实验任务2

代码：

#include <stdlib.h>
#include <stdio.h>
#define N 7
#define M 80

typedef struct {
    char name[M];
    char author[M];
}Book;

int main() {
    Book x[N] = { {"《雕塑家》", "斯科特.麦克劳德"},
                  {"《灯塔》", "克里斯多夫.夏布特"},
                  {"《五号屠宰场》", "库尔特.冯内古特"},
                  {"《出卖月亮的人》", "罗伯特.海因莱茵"},
                  {"《大地之上》", "罗欣顿·米斯特里"},
                  {"《上学记》", "何兆武"},
                  {"《命运》", "蔡崇达"} };

    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);

    system("pause");

    return 0;
}

截图：

实验任务3

代码：

#include <stdlib.h>
#include <stdio.h>
#define N 5
#define M 80

int main(){
    char songs[N][M]={"Working's Blues",
                      "Everything will flow",
                      "Streets of london",
                      "Perfect day",
                      "Love story"};
    int i;
    FILE *fp;

    fp=fopen("data3.txt","w");
    if(fp==NULL){
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<N;++i){
        fputs(songs[i],fp);
        fputs("\n",fp);
    }

    fclose(fp);

    system("pause");

    return 0;
}

#include <stdlib.h>
#include <stdio.h>
#define N 5
#define M 80

int main(){
    char songs[N][M];
    int i;
    FILE *fp;

    fp=fopen("data3.txt","w");
    if(fp==NULL){
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<N;++i)
        fgets(songs[i],80,fp);
        
    for(i=0;i<N;++i)
        printf("%d.%s",i+1,songs[i]);

    fclose(fp);

    system("pause");

    return 0;
}

#include <stdlib.h>
#include <stdio.h>
#define N 5
#define M 80

int main(){
    char ch;
FILE *fp;
fp = fopen("data3.txt", "r");
if(fp == NULL) {
printf("fail to open file\n");
return 1;
}
ch = fgetc(fp);
while(ch != EOF) {
putchar(ch);
ch = fgetc(fp);
}


    fclose(fp);

    system("pause");

    return 0;
}

截图：

实验任务4

代码：

#include <stdlib.h>
#include <stdio.h>
#include<string.h>
#define N 5
#define M 80

int main(){
    char ch[M];
    int n=0;
    FILE*fp;

    fp=fopen("data4.txt","r");

    while(!feof(fp)){
        fscanf(fp,"%s",ch);
        n+=strlen(ch);
    }

    printf("data4.txt:%d",n);


    fclose(fp);

    system("pause");

    return 0;
}

截图：

实验任务5

代码：

#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(<=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;
}

// 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) {
    int i, j;
    
    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 - i - 1; j++) {
            if(s[j].sum < s[j + 1].sum) {
                STU t;
                t = s[j];
                s[j] = s[j + 1];
                s[j + 1] = t;
            }
            
        }
    }
    
    for(i = 0;i < n; i++) {
        if(i <= n * 0.1) strcpy(s[i].level, "优秀");
        else if(i <= n * 0.5) strcpy(s[i].level, "合格");
        else strcpy(s[i].level, "不合格");
    }
}

截图：

实验任务6

代码：

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

const int N = 100;

struct STU {
    int num;
    char name[10];
    char banji[30];
} s[N], t[N];

void input(STU a[], int n) {
    int i;
    FILE *fin;
    
    fin = fopen("list.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }
    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%d %s %s", &a[i].num, a[i].name, a[i].banji);
    }
    fclose(fin);
}

void progress(STU a[], int n) {
    int i, x, j = 0;
    srand(time(0));
    
    for(i = 1;i <= 5; i++) {
        x = rand() % n;
        t[j ++] = s[x];
    }
}

void output(STU a[], int n) {
    int i;
    
    for(i = 0;i < n; i++) {
        printf("%d\t%s\t%s\n", a[i].num, a[i].name, a[i].banji);
    }
    
    FILE *fout;
    fout = fopen("result.txt", "w");
    
    if(!fout) {
        printf("fail to open or create result.txt\n");
        exit(0); 
    }
    for(i = 0;i < n; i++) {
        fprintf(fout, "%d\t%s\t%s\n", a[i].num, a[i].name, a[i].banji);
    }
    
    fclose(fout);
}

int main() {
    
    int n = 80;
    
    input(s, n);
    progress(s, n);    
    output(t, 5);
    
    
    return 0;
} 

截图：