实验6

#include<stdio.h>
int main(){
    char ch;
    FILE *fp;
    
    fp=fopen("data4.txt","r");
    if(fp==NULL){
        printf("fail to open file");
        return 1;
    }
    int count=0;
    ch=fgetc(fp);
    while(ch!=EOF){
        if(ch!=' '&&ch!='\n'&&ch!='    ')
        count++;
        ch=fgetc(fp);
        
    }
    printf("data4.txt中共包含字符数（不计空白符）: %d",count);
    fclose(fp);
    return 0;
}

 

 

 

 

#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) {
    // 补足代码
    // ×××
    int i,j;
    STU m;
    for(i=0;i<n;++i){
        s[i].sum=s[i].objective+s[i].subjective;
    }
    for(i=0;i<n-1;++i){
        for(j=n-1;j>i;--j){
            if(s[j].sum>s[j-1].sum){
                m=s[j];
                s[j]=s[j-1];
                s[j-1]=m;
                
            }
        }
    }
    int k,a;
    k=n*0.1;
    a=n*0.5;
    for(i=0;i<k;++i)
    strcpy(s[i].level,"优秀");
    for(i=k;i<a;++i)
    strcpy(s[i].level,"合格");
    for(i=a;i<n;++i)
    strcpy(s[i].level,"不合格");
    
}

 

 

 

 

#include<stdio.h>
#include<time.h>
#include<stdlib.h>
typedef struct {
    long no;
    char name[20];
    char grade[20];
}STU;
int main(){
    FILE *fp,*fp1;
    STU s[80];
    fp1=fopen("lucky.txt","w");
    fp=fopen("list.txt","r");
    if(fp==NULL){
        printf("fail to open file");
        return 1;
    }
    if(fp1==NULL){
        printf("fail to open file");
        return 1;
    }
    int i;
    for(i=0;i<80;i++){
    fscanf(fp,"%ld%s%s",&s[i].no,s[i].name,s[i].grade);
    }
    fclose(fp);
    srand(time(NULL));                 
    STU c[5];
    int j,k;
    for(i=0;i<5;i++){
    c[i].no=204942000+(rand()%80+1);
}     
    for(j=0;j<5;j++){
        for(k=0;k<80;k++){
            if(s[k].no==c[j].no)
            {  
            c[j]=s[k];
            }                           
        }
    }
    for(i=0;i<5;i++){
    printf("%ld\t%s\t%s\n",c[i].no,c[i].name,c[i].grade);
    fprintf(fp1,"%ld\t%s\t%s\n",c[i].no,c[i].name,c[i].grade);
    } 
    fclose(fp1); 
    return 0;
}

 

 

 

 

 

 

 

 

#include<stdio.h>
#include<time.h>
#include<stdlib.h>
typedef struct {
    long no;
    char name[20];
    char grade[20];
}STU;
int main ()
{
    char buffer[80];
   time_t rawtime = time(NULL);
   struct tm *timer;
   timer = localtime( &rawtime );
   int year=timer->tm_year+1900;
   int month=timer->tm_mon+1;
   int day=timer->tm_mday;  
   strftime(buffer,80,"%Y%m%d.txt",timer);
   
     FILE *fp,*fp1;
    STU s[80];
    fp1=fopen(buffer,"w");
    fp=fopen("list.txt","r");
    if(fp==NULL){
        printf("fail to open file");
        return 1;
    }
    if(fp1==NULL){
        printf("fail to open file");
        return 1;
    }
    int i;
    for(i=0;i<80;i++){
    fscanf(fp,"%ld%s%s",&s[i].no,s[i].name,s[i].grade);
    }
    fclose(fp);
    srand(time(NULL));                 
    STU c[5];
    int j,k;
    for(i=0;i<5;i++){
    c[i].no=204942000+(rand()%80+1);
}     
    for(i=0;i<5;++i){
        for(j=0;j<5;++j){
            if(i==j)
            continue;
            if(c[i].no==c[j].no){
            c[j].no=204942000+(rand()%80+1);
            i=0;
            break;
            }
    }
}
    for(j=0;j<5;j++){
        for(k=0;k<80;k++){
            if(s[k].no==c[j].no)
            {  
            c[j]=s[k];
            }                           
        }
    }
    for(i=0;i<5;i++){
    printf("%ld\t%s\t%s\n",c[i].no,c[i].name,c[i].grade);
    fprintf(fp1,"%ld\t%s\t%s\n",c[i].no,c[i].name,c[i].grade);
    } 
    fclose(fp1); 
    return 0;
}