实验7

 

 

task4

源代码

#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;
}

 

实验结果

task5

源代码

#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("C:\Users\Lenovo\Desktop\实验7数据文件及部分代码.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;
   STU temp;
   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;j++){
        if (s[j].sum<s[j+1].sum) {
            temp=s[j];
            s[j]=s[j+1];
            s[j+1]=temp;
        }
    }

for (i=0;i<n;i++)
{
    if (i+1<=n*0.1) strcpy(s[i].level,"优秀");
    else if (i+1>0.1*n&&i+1<=0.5*n) strcpy (s[i].level,"合格") ;
     else strcpy (s[i].level,"不合格");

    }
}

　　

实验结果

 

 

task6

源代码

#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;
} 

 

实验结果