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

int main() {
	char ch;
	FILE *i, *fp;
	i = fopen("d:\\data\\sy8-1-out.txt", "w");
	ch = getchar();
	while (ch != '#') {
		fputc(ch, i);
		ch = getchar();
	}
	fclose(i);
	i = fopen("d:\\data\\sy8-1-out.txt", "r");
	fp = fopen("d:\\data\\sy8-1-out1.txt", "w");
	while (1) {
		ch = fgetc(i);
		if (feof(i))
			break;
		if (ch <= 'z' && ch >= 'a') {
			ch -= 32;
			printf("%c", ch);
			fputc(ch, fp);
		}
	}
	fclose(fp);
	fclose(i);
	return 0;
}

8-2

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

int main() {
	char str[100];
	int i = 0, n = 10, t, j, s = 0, arr[10];
	float f;
	FILE *fp1, *fp2;
	fp1 = fopen("d:\\data\\sy8-2-in.txt", "r");
	fp2 = fopen("d:\\data\\sy8-2-out.txt", "w");
	for (i = 0; i < n; i++) {
		fscanf(fp1, "%d", &arr[i]);
	}
	for (i = 0; i < n; i++) {
		for (j = i + 1; j < n; j++) {
			if (arr[i] > arr[j]) {
				t = arr[i];
				arr[i] = arr[j];
				arr[j] = t;
			}
		}

	}
	for (i = 1; i < n - 1; i++) {
		s += arr[i];
		printf("%d ", arr[i]);
		fprintf(fp2, "%d", arr[i]);

	}
	f = (float)s / 8;
	fprintf(fp2, "\n%.2f", f);
	printf("\n%.2f", f);
	fclose(fp1);
	fclose(fp2);
	return 0;
}

8-3

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

struct student {
	char num[11];
	char name[11];
	float c[3];
	float j;
};

void input_data(struct student stu[], int n) {
	int i = 0;
	float s = 0;
	for (; i < n; i++) {
		s = 0;
		scanf("%s%s%f%f%f", &stu[i].num, &stu[i].name, &stu[i].c[0], &stu[i].c[1], &stu[i].c[2]);
		s += stu[i].c[0] + stu[i].c[1] + stu[i].c[2];
		stu[i].j = s / 3;
	}
}

void sort(struct student stu[], int n) {
	struct student t;
	int i, j;
	for (i = 0; i < n; i++) {
		for (j = i + 1; j < n; j++) {
			if (stu[i].j > stu[j].j) {
				t = stu[j];
				stu[j] = stu[i];
				stu[i] = t;
			}
		}
	}
}

void save(struct student stu[], int n, char filename[]) {
	int i = 0;
	FILE *fp;
	fp = fopen(filename, "wb");
	for (i = 0; i < n; i++)
		fwrite(&stu[i], sizeof(struct student), 1, fp);
	fclose(fp);
}

int read(struct student stu[], char filename[]) {
	int n = 0, i = 0;
	FILE *fp = fopen(filename, "rb");
	while (fread(&stu[n], sizeof(struct student), 1, fp) == 1) {
		n++;
	}
	fclose(fp);
	return n ;
}

int insert(struct student stu[], int n, struct student x) {
	int i = n - 1;
	x.j = (x.c[0] + x.c[1] + x.c[2]) / 3;

	while (i >= 0 && x.j < stu[i].j) {
		stu[i + 1] = stu[i];
		i--;
	}

	stu[i + 1] = x;
	return n + 1;
}

void print_data(struct student stu[], int n) {
	int i = 0;
	for (; i < n; i++) {
		printf("%s %s %.2f %.2f %.2f %.2f\n", stu[i].num, stu[i].name, stu[i].c[0], stu[i].c[1], stu[i].c[2], stu[i].j);
	}

}

int main() {
	int n;
	scanf("%d", &n);
	struct student stu[100];
	input_data(stu, n);
	sort(stu, n);
	save(stu, n, "d:\\data\\sy8-3-in.txt");
	print_data(stu, n);
	struct student x;
	scanf("%s%s%f%f%f", &x.num, &x.name, &x.c[0], &x.c[1], &x.c[2]);
	n = insert(stu, n, x);
	save(stu, n, "d:\\data\\sy8-3-out.txt");
	n = read(stu, "d:\\data\\sy8-3-out.txt");
	print_data(stu, n);
	printf("%d", n);
	return 0;
}

8-4

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

struct student {
	char num[11];
	char name[11];
	float c[3];
	float j;
};

struct node {
	char num[11];
	char name[11];
	float c[3];
	float j;
	struct node *next;
};

struct node *create(char filename[]) {
	int i = 0, n = 3;
	struct node *h, *p, *q;
	h = (struct node *)malloc(sizeof(struct node));
	h->next = NULL;
	struct student t;
	FILE *fp = fopen(filename, "rb");
	for (; fread(&t, sizeof(struct student), 1, fp) == 1;) {
		p = (struct node *)malloc(sizeof(struct node));
		strcpy(p->num, t.num);
		strcpy(p->name, t.name);
		for (i = 0; i < n; i++)
			p->c[i] = t.c[i];
		p->j = t.j;
		p->next = h->next;
		h->next = p;
	}
	return h;
}

void print(struct node *h) {
	struct node *p;
	p = h->next;
	while (p != NULL) {
		printf("%s %s %f %f %f %f\n", p->num, p->name, p->c[0], p->c[1], p->c[2], p->j);
		p = p->next;
	}

}

int main() {
	struct node *h;
	h = create("d:\\data\\sy8-3-out.txt");
	print(h);
	return 0;
}