实验7

实验任务4

源代码

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

#define N 100
#define M 80

void write();
int level();
int character();

int main(){
    int line,n;
    write();
    line = level();
    n = character();
    printf("data4.txt统计结果：\n");
    printf("行数:\t\t%d\n",line);
    printf("字符数（不计空白符）:\t\t%d\n",n);

    system("pause");
    return 0;
}

void write(){
    char *ptr[] = {"0123456789-0123456789",
                    "nuist2026",
                    "cosmos galaxy"};
    int i,n;
    FILE *fp;

    fp = fopen("data4.txt","w");
    if(fp == NULL){
        printf("fail to open file to write\n");
        return;
    }

    n = sizeof(ptr)/sizeof(ptr[0]);

    for(i = 0;i < n;++i){
        fputs(ptr[i],fp);
        fputs("\n",fp);
    }
    fclose(fp);
}

int level(){
    int i = 0;
    char ch;

    FILE *fp;
    fp = fopen("data4.txt","r");
    if(fp == NULL){
        printf("fail to file to open\n");
        return 0;
    }

    while((ch = fgetc(fp))!= EOF){
        if(ch == '\n')
            i++;
    }
    fclose(fp);
    return i;
}

int character(){
    int i = 0;
    char ch;

    FILE *fp;
    fp = fopen("data4.txt","r");
    if(fp == NULL){
        printf("fail to file to open\n");
        return -1;
    }
    while((ch = fgetc(fp))!= EOF){
        if(ch != ' ' && ch != '\t' && ch != '\n')
            i++;
    }
    fclose(fp);
    return i;
}

 

运行结果截图

 

---

 

实验任务5

源代码

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


#define N 10

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

void read(STU st[],int n);
void write(STU st[],int n);
void output(STU st[],int n);
int process(STU st[],int n,STU st_pass[]);

int main(){
    

    STU stu[N],stu_pass[N];
    int cnt;
    double pass_rate;

    printf("从文件读入%d个考生信息：已完成\n", N);
    read(stu, N);

    printf("\n对考生成绩进行统计：已完成\n");
    cnt = process(stu, N, stu_pass);

    printf("\n所有考生完整信息：\n");
    output(stu,N);
    
    printf("\n通过考试的名单写入文件：已完成！\n");
    write(stu_pass,cnt);

    pass_rate = 1.0 * cnt / N;
    printf("\n本次考试等级通过率：%.2f%%\n",pass_rate*100);


    system("pause");
    return 0;
}

void output(STU st[],int n){
    int i;
    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结果\n");
    for(i = 0;i <n;i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n",st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
        
}

void read(STU st[], int n){
    int i;
    FILE *fin;

    fin = fopen("examinee.txt","r");
    if(!fin){
        printf("fail to open file\n");
        return;
    }
    for(i = 0;i<n;i++)
        fscanf(fin,"%ld %s %f %f",&st[i].id,st[i].name,&st[i].objective,&st[i].subjective);

    fclose(fin);
}

//对考生信息进行处理：计算每位考生考试总分、结果；统计并返回通过考试的人数
int process(STU st[], int n,STU st_pass[]){
    int i,m=0;
    
    for(i = 0;i < n;i++){
        st[i].sum = st[i].objective + st[i].subjective;
        if(st[i].sum >= 60){
            m++;
            strcpy(st[i].result,"通过");
            st_pass[m] = st[i];
        }else{
            strcpy(st[i].result,"未通过");
        }
    }
    
    return m;
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void write(STU st[],int n){
    int i;
    FILE *fin;

    fin = fopen("list_pass.txt","w");
    if(fin == NULL){
        printf("fail to open file\n");
        return;
    }
    fprintf(fin,"准考证号\t\t姓名\t客观题得分\t\t操作题得分\t\t总分\t\t结果\n");
    for(i = 0;i < n;i++){
        fprintf(fin,"%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n",st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
    }

    fclose(fin);
}

 

屏幕输出截图

 

文件list_pass.txt内容截图

 

---

实验任务6

源代码

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

#define N 80
#define M 5

typedef struct{
    char id[20];
    char name[20];
    char cls[30];
}Student;

int read(Student stu[]);
void random(int sum,int lift[]);
void write(Student stu[],int idx[],int num,char filename);

int main(){
    Student stu[N];
    int i,n;
    int sum = read(stu);
    int idx[M];
    char filename[N];

    random(sum,idx);

    printf("----------中奖名单----------\n");
    for(i = 0;i < M;i++){
        n = idx[i];
        printf("%s\t%s\t%s\n",stu[n].id,stu[n].name,stu[n].cls);
    }

    printf("----------保存到文件----------\n");
    printf("输入文件名：");
    scanf("%s",filename);
    strcat(filename,".txt");

    write(stu,idx,M,filename);

    printf("保存成功\n");

    system("pause");
    return 0;
}

int read(Student stu[]){
    int cnt = 0;

    FILE *fp;
    fp = fopen("list.txt","r");
    if(fp == NULL){
        printf("fail to open to file\n");
        return 1;
    }
    
    while(fscanf(fp,"%s %s %s",stu[cnt].id,stu[cnt].name,stu[cnt].cls) == 3){
        cnt++;
    }

    fclose(fp);
    return cnt;

}

void random(int sum,int lift[]){
    int m[N] = {0};
    int i = 0,j;
    srand((unsigned)time(NULL));
    while(i < M){
        j = rand()%sum;
        if(m[j] == 0){
            m[j] = 1;
            lift[i++] = j;
        }
    }
}

void write(Student stu[],int idx[],int num,char filename[]){
    int i;
    int n;

    FILE *fp;
    fp = fopen(filename,"w");
    if(fp == NULL){
        printf("fail to open to file\n");
        return;
    }

    for(i = 0; i < num;i++){
        n = idx[i];
        fprintf(fp,"%s\t%s\t%s\t",stu[n].id,stu[n].name,stu[n].cls);
    }

    fclose(fp);
}

 

运行结果截图