实验七

task.4

#include<stdio.h>
int main(){
    int i,cnt=0;
    char ch;
    FILE*fp;

    fp = fopen("data4.txt","r");;
    if(fp == NULL){
        printf("fail to open file\n");
        return 1;
    }

    while(EOF !=(ch = fgetc(fp))){
        if(ch!='\0'&&ch!='\n'&&ch!='\t'&&ch!=' '){
        cnt++;}
    }
    fclose(fp);
    printf("data4.txt中共包含字符数（不计空白符）：%d\n",cnt);    

    return 0;
}

 

task.5

#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;//主观题得分 
    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("从文件中读入%d个考生的信息：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);
} 

//输出完整考生信息：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;
    STU t;
    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-i;j++)
    if(s[j].sum < s[j+1].sum)
    {
    t = s[j];
    s[j] = s[j+1];
    s[j+1] = t;}
    
    for(i=0;i<n;i++){
    if(i==0)
    strcpy(s[i].level,"优秀"); 
    else if(i<=4&&i>0)
    strcpy(s[i].level,"良好");
    else
    strcpy(s[i].level,"不合格");
}
    
} 

task.6

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

typedef struct{
    long int id;
    char name[80];
    char classname[80];
}STU;

//函数声明 
void input(STU s[],int n);
void process(STU s[], int n);

int main(){
    STU stu[N];
    
    input(stu, N);
    
    process(stu, N);
    
    return 0;
    
}

void input(STU s[],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,"%ld %s %s",&s[i].id,s[i].name,s[i].classname);}
    }
    
    fclose(fin);
}

void process(STU s[],int n){
    srand(time(NULL));
    int b[5];
    int i=0;
    for(i=0;i<5;i++){
    
    b[i]=rand()% 80 + 1;
    
    }
    for(i=0;i<5;i++)
    {
    printf("%ld\t%s\t%s\n",s[b[i]].id,s[b[i]].name,s[b[i]].classname);}
    FILE *fout;    
    //保存到文件
    fout = fopen("lucky.txt","w");
    if(!fout){
        printf("fail to open or creat lucky.txt\n");
        exit(0);
    } 
    for(i=0;i<5;i++)
    fprintf(fout,"%ld\t%s\t%s\n",s[b[i]].id,s[b[i]].name,s[b[i]].classname);
    
    fclose(fout);
}