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实验七

时间:2023-06-14 13:35:35浏览次数:29  
标签:int void STU 实验 printf include fin

实验任务4

源代码

#include <stdio.h>
#include <ctype.h>

int main() {
    char ch;
    FILE *fp;
    int n=0; 

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

    ch = fgetc(fp);
    while(ch != EOF) {
       if(!isspace(ch)){n++;
   }
        ch = fgetc(fp);
        
    }

    fclose(fp);
    printf("data4.txt中共包含的字符数:%d",n);
    return 0;
}

 

 

 

实验任务5

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
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
// 不仅输出到屏幕上,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
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;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<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"); 
    }
 
}

 

 

 

 

实验任务6

源代码

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>

#define N 80
#define M 100

typedef struct {
long int id;
char name[20];
char banji[100];
} STU;

// 函数声明
void input(STU s[], int n);
void output(STU s[],int n);
int main() {
STU stu[N];


input(stu, N);

printf("随机抽选:\n");
output(stu,5);

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].banji);
}

fclose(fin);
}
void output(STU s[], int n) {
FILE *fout;
STU t[5];
int i;
int k;
// 输出
printf("\n");
srand((unsigned)time(NULL));

for (i = 0; i < n; i++){

int k=(rand()%80);
t[i]=s[k];
printf("%ld\t\t%s\t%s\n", s[k].id, s[k].name, s[k].banji);
}
// 保存
fout = fopen("lucky.txt", "w");
if (!fout) {
printf("fail to open or create lucky.txt\n");
exit(0);
}

for (i = 0; i < n; i++)
fprintf(fout, "%ld\t\t%s\t%s\n", t[i].id, t[i].name, t[i].banji);

fclose(fout);
}

 

 

 

 

标签:int,void,STU,实验,printf,include,fin
From: https://www.cnblogs.com/juhuajing/p/17479942.html

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