Experiment7

#include<stdio.h>

int main(){
    int num=0;
    char ch;

    FILE *fp;
    fp=fopen("D:\data4.txt","r");

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

    while(!feof(fp))
    {
        ch=fgetc(fp);
        printf("%c",ch);

        if(ch!=' '&& ch!='\n')
           num++;
    }
    num--;

    fclose(fp);

    printf("\ndata4.txt中包含的字符数(不计空白符)：%d\n",num);

    return 0;
}

#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);

    return 0;
}

void input(STU s[], int n) {
    int i;
    FILE *fin;

    fin = fopen("D:\\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 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-i-1;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<n*0.1)
            strcpy(s[i].level ,"优秀");
        else if(i>=n*0.1 &&i<n*0.5)
                 strcpy(s[i].level ,"合格");
        else
        strcpy(s[i].level ,"不合格");
    }
}

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
#define N 80
 
typedef struct {
    long int id;
    char name[20];
    char clas[100];
    int num;
} STU;
 
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);
 
int main() {
    int i,index=0,random=0;
    int ran[5]={0};
    STU stu[N],r[N];
    input(stu, N);
    process(stu, N);
    while(index<5){
        random=rand()%80;
        ran[index]=random%100;
        index++;}
    for(i=0;i<5;i++)
    {r[i]=stu[ran[i]];}
    output(r, N);

    return 0;
}
 
void input(STU s[], int n) {
    int i;
    FILE *fin;
 
    fin = fopen("D:\\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].clas);
    }
 
    fclose(fin);
}
 
void output(STU s[], int n) {
    FILE *fout;
    int i;
    printf("\n");
    for (i = 0; i < 5; i++)
        printf("%ld\t\t%s\t%s\t\n", s[i].id, s[i].name, s[i].clas);
    fout = fopen("lucky.txt", "w");
    if (!fout) {
        printf("fail to open or create result.txt\n");
        exit(0);
    }
     
 
    for (i = 0; i < 5; i++)
        fprintf(fout, "%ld\t\t%s\t%s\t\t", s[i].id, s[i].name, s[i].clas);
    fclose(fout);
}
 
void process(STU s[], int n) {
    int i;
    for(i=0;i<N;i++)
        s[i].num=i;
     
}