实验七

task4

代码

#include <stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 5
#define M 80
 
int main() {
    char ch[M];
    int ch_counts = 0,n=0;
   FILE *fp;
   fp = fopen("data4.txt","r");
   if(fp==NULL){
       printf("fail to open file\n");
       return 1;}
while(!feof(fp)){
    fscanf(fp,"%s",ch);
n=n+strlen(ch);}
 
 printf("data4.txt中共包含字符数（不计空白符）：%d",n);
   fclose(fp);
   system("pause");
   return 0;
}

结果

task5

代码

#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) {
    int i, j;
    
    for(i = 0;i < n; i++) {
        s[i].sum = s[i].objective + s[i].subjective;
    }
    
    for(i = 0;i < n; i++) {
        for(j = 0;j < n - i - 1; j++) {
            if(s[j].sum < s[j + 1].sum) {
                STU t;
                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 * 0.5) strcpy(s[i].level, "合格");
        else strcpy(s[i].level, "不合格");
    }
}

结果

task6

代码

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

const int N = 100;

struct STU {
    int num;
    char name[10];
    char banji[30];
} s[N], t[N];

void input(STU a[], 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, "%d %s %s", &a[i].num, a[i].name, a[i].banji);
    }
    fclose(fin);
}

void progress(STU a[], int n) {
    int i, x, j = 0;
    srand(time(0));
    
    for(i = 1;i <= 5; i++) {
        x = rand() % n;
        t[j ++] = s[x];
    }
}

void output(STU a[], int n) {
    int i;
    
    for(i = 0;i < n; i++) {
        printf("%d\t%s\t%s\n", a[i].num, a[i].name, a[i].banji);
    }
    
    FILE *fout;
    fout = fopen("result.txt", "w");
    
    if(!fout) {
        printf("fail to open or create result.txt\n");
        exit(0); 
    }
    for(i = 0;i < n; i++) {
        fprintf(fout, "%d\t%s\t%s\n", a[i].num, a[i].name, a[i].banji);
    }
    
    fclose(fout);
}

int main() {
    
    int n = 80;
    
    input(s, n);
    progress(s, n);    
    output(t, 5);
    
    
    return 0;
} 

结果