实验5

#include <stdio.h>
#define N 5
#define M 80

typedef struct {
	char name[M]; // 书名
	char author[M]; // 作者
} Book;

int main() {
	Book x[N] = { {"一九八四", "乔治.奥威尔"},
		{"美丽新世界", "赫胥黎"},
		{"昨日的世界", "斯蒂芬.茨威格"},
		{"万历十五年", "黄仁宇"},
		{"一只特立独行的猪", "王小波"}
	};
	int i;
	FILE *fp;
	fp = fopen("data1.txt", "w");
	if (fp == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < N; ++i) {
		fprintf(fp, "%-20s %-20s\n", x[i].name, x[i].author);
		printf("%-20s %-20s\n", x[i].name, x[i].author);
	}
	fclose(fp);
	return 0;
}

　　

 

#include <stdio.h>
#define N 5
#define M 80

typedef struct {
	char name[M];
	char author[M];
} Book;

int main() {
	Book x[N];
	int i;
	FILE *fp;
	fp = fopen("data1.txt", "r");
	if (fp == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < N; ++i) {
		fscanf(fp, "%s %s\n", x[i].name, x[i].author);
		printf("%-20s %-20s\n", x[i].name, x[i].author);
	}
	fclose(fp);
	return 0;
}

　　

x[i].name和x[i].author都是字符串，他们的地址就是本身。

 

#include <stdio.h>
#define N 5
#define M 80

typedef struct {
	char name[M];
	char author[M];
} Book;

int main() {
	Book x[N] = { {"一九八四", "乔治.奥威尔"},
		{"美丽新世界", "赫胥黎"},
		{"昨日的世界", "斯蒂芬.茨威格"},
		{"万历十五年", "黄仁宇"},
		{"一只特立独行的猪", "王小波"}
	};
	int i;
	FILE *fp;
	fp = fopen("data2.dat", "wb");
	if (fp == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	fwrite(x, sizeof(Book), N, fp);
	fclose(fp);
	return 0;
}

　　

 

#include <stdio.h>
#define N 5
#define M 80

typedef struct {
	char name[M];
	char author[M];
} Book;

int main() {
	Book x[N];
	int i;
	FILE *fp;
	fp = fopen("data2.dat", "rb");
	if (fp == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	fread(x, sizeof(Book), N, fp);
	for (i = 0; i < N; ++i)
		printf("%-20s%-20s\n", x[i].name, x[i].author);
	fclose(fp);
	return 0;
}

　　

 

 

#include <stdio.h>

int main() {
	FILE *fin, *fout;
	char ch;
	fin = fopen("data3_1.txt", "r");
	if (fin == NULL) {
		printf("fail to open data3_1.txt\n");
		return 1;
	}
	fout = fopen("data3_2.txt", "w");
	if (fout == NULL) {
		printf("fail to open data3_2.txt\n");
		return 1;
	}
	while ( !feof(fin) ) {
		ch = fgetc(fin);
		if (ch >= 'a' && ch <= 'z')
			ch -= 32;
		fputc(ch, fout);
	}
	fclose(fin);
	fclose(fout);
	return 0;
}

　　

 

#include <stdio.h>

int main() {
	int i, num = 0;
	char ch;
	FILE *fin;
	fin = fopen("data3_1.txt", "r");

	if (fin == NULL) {
		printf("fail to open data3_1.txt\n");
		return 1;
	}

	while (!feof(fin)) {
		ch = fgetc(fin);
		if (ch != ' ' && ch != '\t' && ch != '\n' && ch != EOF)
			num = num + 1;
	}
	fclose(fin);

	printf("data3_1.txt中共包含字符数：%d个", num);

	return 0;
}

　　

 

 

#include <stdio.h>
#define N 5

typedef struct {
	long no;
	char name[20];
	int score;
} STU;
int findMinlist(STU s[], int n, STU t[]);

int main() {
	STU stu[N], minlist[N];
	int count, i;
	FILE *fin, *fout;
	fin = fopen("data4_1.txt", "r");
	if (fin == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < N; ++i) {
		fscanf(fin, "%ld %s %d", &stu[i].no, stu[i].name, &stu[i].score);
		printf("%ld %s %d\n", stu[i].no, stu[i].name, stu[i].score);
	}
	fclose(fin);
	count = findMinlist(stu, N, minlist);
	printf("\n一共有%d个最低分，信息如下: \n", count);
	for (i = 0; i < count; ++i)
		printf("%ld %s %d\n", minlist[i].no, minlist[i].name,
		       minlist[i].score);
	fout = fopen("data4_2.txt", "w");
	if (fout == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < count; ++i)
		fprintf(fout, "%ld %s %d\n", minlist[i].no, minlist[i].name,
		        minlist[i].score);
	fclose(fout);
	return 0;
}

int findMinlist(STU s[], int n, STU t[]) {
	int i, k, min_score;
	min_score = s[0].score;
	for (i = 1; i < n; ++i)
		if (s[i].score < min_score)
			min_score = s[i].score;
	k = 0;
	for (i = 0; i < n; ++i)
		if (s[i].score == min_score) {
			t[k] = s[i];
			++k;
		}
	return k;
}

　　

 

 

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define N 10

typedef struct {
	long int id;
	char name[20];
	float objective;
	float subjective;
	float sum;
	char level[10];
} STU;
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;
}
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);
}

void output(STU s[], int n) {
	FILE *fout;
	int i;
	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);
	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);
}

void process(STU s[], int n) {
	int i, j, k;
	STU temp;
	for (i = 0; i < n; ++i) {
		s[i].sum = s[i].objective + s[i].subjective;
	}
	for (i = 0; i < n; i++) {
		for (k = 0; k < n - 1 - i; k++) {
			if (s[k].sum < s[k + 1].sum) {
				temp = s[k];
				s[k] = s[k + 1];
				s[k + 1] = temp;
			}
		}
	}
	j = n / 10;
	for (i = 0; i < j; i++) {
		strcpy(s[i].level, "优秀");
	}
	k = n / 2;
	for (i = j; i < k; ++i) {
		strcpy(s[i].level, "合格");
	}
	for (i = k; i < n; i++) {
		strcpy(s[i].level, "不合格");
	}
}

　　

 

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 81
#define M 5

typedef struct {
	long int id;
	char name[20];
	char banji[60];
} STU;

int main() {
	int i, j;
	STU x[N], ran[M];
	FILE *fin, *fout;
	fin = fopen("list.txt", "r");
	if (fin == NULL) {
		printf("fail to open list.txt\n");
		return 1;
	}
	for (i = 1; i <= N; i++) {
		fscanf(fin, "%ld %s %s", &x[i].id, x[i].name, x[i].banji);
	}
	fclose(fin);
	srand(time(0));
	j = rand() % (80) + 1;
	for (i = 0; i < M; i++) {
		ran[i] = x[j];
		j = rand() % (80) + 1;
	}
	fout = fopen("lucky.txt", "w");
	if (fout == NULL) {
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < M; i++) {
		fprintf(fout, "%ld %s %s\n", ran[i].id, ran[i].name, ran[i].banji);
		printf("%ld %s %s\n", ran[i].id, ran[i].name, ran[i].banji);
	}
	fclose(fout);
	return 0;
}