实验七
任务四
点击查看代码
#include <stdio.h>
#include <stdlib.h> // system()所需头文件
int main() {
FILE *fp;
char ch;
int line_count = 0;
int char_count = 0;
if ((fp = fopen("data4.txt", "r")) == NULL) {
printf("文件打开失败!请检查data4.txt是否和程序放在同一文件夹\n");
system("pause");
return 1;
}
while ((ch = fgetc(fp)) != EOF) {
if (ch == '\n') {
line_count++;
}
else if (ch != ' ' && ch != '\t') {
char_count++;
}
}
fclose(fp);
printf("data4.txt统计结果:\n");
printf("行数:%18d\n", line_count);
printf("字符数(不计空白符):%8d\n", char_count);
system("pause");
return 0;
}

任务五
点击查看代码
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#define N 10
typedef struct {
long id; // 准考证号
char name[20]; // 姓名
float objective; // 客观题得分
float subjective; // 操作题得分
float sum; // 总分
char result[10]; // 考试结果
} STU;
// 函数声明
void read(STU st[], int n);
void write(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);
int main() {
STU stu[N], stu_pass[N];
int cnt;
double pass_rate;
printf("从文件读入%d个考生信息: 已完成\n", N);
read(stu, N);
printf("\n对考生成绩进行统计: 已完成\n");
cnt = process(stu, N, stu_pass);
printf("\n所有考生完整信息:\n");
output(stu, N);
printf("\n通过考试的名单写入文件: 已完成!\n");
write(stu_pass, cnt);
pass_rate = 1.0 * cnt / N;
printf("\n本次等级考试通过率: %.2f%%\n", pass_rate * 100);
return 0;
}
// 把所有考生完整信息输出到屏幕上
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
void output(STU st[], int n) {
int i;
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结果\n");
for (i = 0; i < n; i++)
printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
}
// 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 read(STU st[], int n) {
int i;
FILE* fin;
fin = fopen("examinee.txt", "r");
if (!fin) {
printf("fail to open file\n");
return;
}
for (i = 0; i < n; i++)
fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
fclose(fin);
}
int process(STU st[], int n, STU st_pass[]) {
int j = 0;
for (int i = 0; i < n; ++i)
st[i].sum = st[i].objective + st[i].subjective;
for (int i = 0; i < n; ++i) {
if (st[i].sum >= 60) {
strcpy(st[i].result, "通过");
st_pass[j++] = st[i];
}
else
strcpy(st[i].result, "不通过");
}
return j;
}
void write(STU st[], int n) {
FILE* fp;
fp = fopen("list_pass.txt", "w");
if (!fp) {
printf("fail to open");
return;
}
fprintf(fp, "%-20s%-20s%-20s%-20s%-20s%s\n", "准考证号", "姓名", "客观题得分", "操作题得分", "总分", "结果");
for (int i = 0; i < n; ++i)
fprintf(fp, "%-20ld%-20s%-20g%-20g%-20g%-20s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
fclose(fp);
}


任务六、
点击查看代码
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80
#define M 5
typedef struct{
long id;
char name[10];
char cls[20];
} STU;
int main()
{
STU all[N];
STU lucky[M];
FILE *fin,*fp;
char outfilename[N];
int i,j,k=0,randIdx;
int flag[N]={0};
fin=fopen("D:\\C练习\\实验课\\实验7\\实验7数据文件及部分代码_gbk\\list.txt","r");
if(!fin){
printf("fail to open file\n");
return 0;
}
while(fscanf(fin,"%ld%s%s",&all[k].id,all[k].name,all[k].cls)!=EOF)
{
k++;
}
fclose(fin);
srand((unsigned)time(NULL));
for(i=0;i<5;++i)
{
do{
randIdx=rand()%80;
}while(flag[randIdx]==1);
flag[randIdx]=1;
lucky[i]=all[randIdx];
}
printf("------------中奖名单------------\n");
for(i=0;i<5;++i)
{
printf("%ld\t%s\t%s\n",lucky[i].id,lucky[i].name,lucky[i].cls);
}
printf("------------保存到文件-----------\n");
printf("输入文件名:");
scanf("%s",outfilename);
fp=fopen(outfilename,"w");
if(!fp)
{
printf("fail to open file\n");
return 0;
}
for(i=0;i<5;++i)
{
fprintf(fp,"%ld\t%s\t%s\n",lucky[i].id,lucky[i].name,lucky[i].cls);
}
fclose(fp);
printf("文件保存成功!");
return 0;
}



浙公网安备 33010602011771号