实验6

#include<stdio.h>
#define _CRT_SECURE_NO_WARNINGS
#include<stdlib.h>
int main(){
char ch;
int count=0;
FILE *fp;
fp=fopen("data4.txt","r");
if(fp==NULL)
{
printf("fail to open file");
return 1;
}
ch=fgetc(fp);
while(ch!=EOF)
{
if(ch!=' '&&ch!='\n'&&ch!=' ')
count++;
ch=fgetc(fp);
}
printf("data4.txt中共包含字符数（不计空白符）: %d",count);
fclose(fp);
system("pause");
return 0;
}

#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;
int j;
float t;
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)
{
t = s[j].sum;
s[j].sum = s[j + 1].sum;
s[j + 1].sum = t;
}
}
for (i = 0; i < 0.1 * n; i++)
strcpy(s[i].level, "优秀");
for (i = 0.1 * n; i < 0.5 * n; i++)
strcpy(s[i].level, "合格");
for (i = 0.5 * n; i < n; i++)
strcpy(s[i].level, "不合格");
}

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include<time.h>
typedef struct {
long int no;
char name[20];
char class[20];
} STU;

int main() {
STU stu[80];
int i,j;
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 < 80; i++)
fscanf(fin, "%ld %s %s", &stu[i].no, stu[i].name, stu[i].class);
}
fclose(fin);

FILE* fout;
STU lucky[5];
srand((unsigned int)time(NULL));
for (i = 0; i < 5; i++)
{
lucky[i].no = 204942000 + (rand() % 80 + 1);
}
for (i = 0; i < 5; i++)
{
for (j = 0; j < 80; j++)
{
if (lucky[i].no == stu[j].no)
lucky[i] = stu[j];
}
}
for (i = 0; i < 5; i++)
printf("%ld\t%s\t%s\n", lucky[i].no, lucky[i].name, lucky[i].class);

fout = fopen("lucky.txt", "w");
if (!fout) {
printf("fail to open or create lucky.txt\n");
exit(0);
}
for (i = 0; i < 5; i++)
{
fprintf(fout, "%ld\t%s\t%s\n", lucky[i].no, lucky[i].name, lucky[i].class);
}
fclose(fout);
return 0;
}