实验7

实验任务1

程序源码

#include<stdio.h>
#include<stdlib.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("datal.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;
}

 

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程序源码

#include<stdio.h>
#include<stdlib.h>
#define N 10
#define M 80

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

int main(){
    Book x[N];
    int i, n;

    FILE *fp;

    fp = fopen("datal.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;
}

 

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讨论

实验任务2

程序源码

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

 

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程序源码

#include<stdio.h>
#include<stdlib.h>
#define N 7
#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("%d. %-20s%-20s\n", i+1, x[i].name, x[i].author);

    fclose(fp);

    system("pause");
    return 0;
}

 

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实验任务3

程序源码

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

int main(){
    char songs[N][M] = {"Working\'s Blues",
                        "Everything Will Flow",
                        "Streets of London",
                        "Perfect Day",
                        "Philadelphia"};

    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;
}

 

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程序源码

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

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

    fp = fopen("data3.txt", "r");
    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;
}

 

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程序源码

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

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;
}

 

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实验任务4

程序源码

#include<stdio.h>
#include<stdlib.h>
int main()
{
    char s[100];
    FILE *fp;
    int i = 0,j,k = 0;
    char ch;
    fp = fopen("data4.txt","rb");

    if(fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    ch = fgetc(fp);
    while(ch!=EOF)
    {
        s[i++] = ch;
        ch = fgetc(fp);


    }

    for(j = 0;j<i-1;j++)
        if(s[j]!=' ')
            k++;

    fclose(fp);
    printf("data4.txt中共包含字符数（不计空白符）：%d",k-1);
    system("pause");
    return 0;

 

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实验任务5

程序源码

#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);

    system("pause");
    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 temp;
   for (i=0;i<n;i++)
   {
       s[i].sum=s[i].objective+s[i].subjective;

   }
    for(i=0;i<n-1;i++)
    for (j=0;j<n-1;j++){
        if (s[j].sum<s[j+1].sum) {
            temp=s[j];
            s[j]=s[j+1];
            s[j+1]=temp;
        }
    }

for (i=0;i<n;i++)
{
    if (i+1<=n*0.1) strcpy(s[i].level,"优秀");
    else if (i+1>0.1*n&&i+1<=0.5*n) strcpy (s[i].level,"合格") ;
     else strcpy (s[i].level,"不合格");

    }
}

 

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实验任务6

程序源码

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

typedef struct{
    long int num;
    char name[M];
    char c[M];
}STU;

int main(){
    STU s[M];
    int i;
    int x[N];
    
    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<M;i++)
            fscanf(fin,"%ld %s %s",&s[i].num,s[i].name,s[i].c);
    }
    srand(time(NULL));
    for(i=0;i<N;i++){
        x[i]=1+rand()%80;
    }
    fclose(fin);
    
    FILE *fout;
    
    for(i=0;i<N;i++){
        printf("%ld\t\t%s\t\t%s\n",s[x[i]].num,s[x[i]].name,s[x[i]].c);
    }
    
    fout=fopen("lucky.txt","w");
    if(!fout){
        printf("fail to open or creat lucky.txt\n");
        exit(0);
    }
    for(i=0;i<N;i++)
        fprintf(fout,"%ld\t\t%s\t\t%s\n",s[x[i]].num,s[x[i]].name,s[x[i]].c); 
    fclose(fout);
}

 

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