实验6

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	char a;
	char c[2][100] = {"nuist2022 - nuist2023",
		              "FIFA World Cup 2022"};
	FILE* fp;
	int i=0,k=0;
	fp = fopen("data4.txt", "w");
	if (fp == NULL)
	{
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < 2; i++)
	{
		fprintf(fp, "%s\n", c[i]);
	}
	fclose(fp);
	fp = fopen("data4.txt", "r");
	if (fp == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	a = fgetc(fp);
	while (a != EOF)
	{
		if (a != ' '&&a!='\n')
			k++;
		a = fgetc(fp);
	}
	printf("data4.txt中共包含字符数（不计空白符）：%d", k);

}

#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) {
	int i,j;
	STU k;
	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 - i; j++) {
			if (s[j].sum < s[j + 1].sum)
			{
				k = s[j];
				s[j] = s[j + 1];
				s[j + 1] = k;
			}
		}
	}
	for (i = 0; i < 0.1 * n; i++)
		strcpy(s[i].level, "优秀");
	for (; i < 0.5 * n; i++)
		strcpy(s[i].level, "合格");
	for (; i < n; i++)
		strcpy(s[i].level, "不及格");
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
typedef struct {
	int num;
	char name[10];
	char cla[50];
}STU;
int main()
{
	int i,j;
	STU a[80], s[5];
	FILE* fp;
	fp = fopen("list.txt", "r");
	if (fp == NULL)
	{
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < 80; i++)
	{
		fscanf(fp, "%d %s %s", &a[i].num, a[i].name, a[i].cla);
	}
	for (i = 0; i < 5; i++)
	{
		s[i].num = 204942000 + rand() % 79 + 1;
		for (j = 0; j < 80; j++)
		{
			if (a[j].num == s[i].num)
				s[i] = a[j];
		}
	}
	fp = fopen("lucky.txt", "w");
	if (fp == NULL)
	{
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < 5; i++)
	{
		fprintf(fp, "%d %s %s\n", s[i].num, s[i].name, s[i].cla);
	}
	for (i = 0; i < 5; i++)
	{
		printf("%d %s %s\n", s[i].num, s[i].name, s[i].cla);
	}
	return 0;
}