实验7

实验任务4

实验代码

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

const int N = 5, M = 100;

int main() {
    char ch[M];
    int n = 0;
   	FILE *fp;
   	
   	fp = fopen("data4.txt","r");
   
	while(! feof(fp)) {
    	fscanf(fp,"%s",ch);
		n += strlen(ch);
	}
	
 
 	printf("data4.txt:%d",n);
	
	fclose(fp);
   	
   	return 0;
}

实验结论

实验任务5

实验代码

#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("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;
	
	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 - i - 1; j++) {
			if(s[j].sum < s[j + 1].sum) {
				STU t;
				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 * 0.5) strcpy(s[i].level, "合格");
		else strcpy(s[i].level, "不合格");
	}
}

实验结论

实验任务6

实验代码

#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;
} 

实验结论