实验七

4

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
const int N = 5, M = 100;
 
int main() {
    char ch[M];
    int n = 0;
    FILE *fp;
     
    fp = fopen("data4.txt","r");
    
    while(! feof(fp)) {
        fscanf(fp,"%s",ch);
        n += strlen(ch);
    }
     
  
    printf("data4.txt:%d",n);
     
    fclose(fp);
     
    return 0;
}

7.5

#define _CRT_SECURE_NO_WARNINGS
#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) {
    STU tmp;
    int i, j;
    
    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) {
                tmp = s[j];
                s[j] = s[j + 1];
                s[j + 1] = tmp;
            }
        }
    }
    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");
    }
    
}

7.6

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include<time.h>
 
#define N 80
 
typedef struct {
    long int id;
    char name[20];
    char clas[100];
    int num;
} 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() {
    int i,index=0,random=0;
    int ran[5]={0};
    STU stu[N],r[N];
    input(stu, N);
    process(stu, N);
    srand((unsigned)time(NULL));
    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);
    system("pause");
    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;
     
}