实验7
实验任务4
task4.c
`#include <stdio.h>
define N 80
include <string.h>
void read();
int main()
{
printf("data4.txt统计结果:\n");
read();
return 0;
}
void read() {
FILE* fp;
int i = 0,c=0;
char s[N][80];
fp = fopen("data4.txt", "r");
if (!fp) {
printf("fail to open file to write\n");
return;
}
while (fgets(s[i], 80, fp) != NULL) {
int len = strlen(s[i]);
for (int j = 0; j < len; j++) {
if ((s[i][j] != ' ')&&(s[i][j]!='\n')) {
c = c + 1;
}
}
i++;
}
fclose(fp);
printf("行数:\t\t%10d\n", i);
printf("字符数(不计空白符):%7d\n",c);
}
`
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实验任务5
task5.c
`#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...\n", N);
read(stu, N);
printf("\n对考生成绩进行统计...\n");
cnt = process(stu, N, stu_pass);
printf("\n通过考试的名单:\n");
output(stu, N); // 输出所有考生完整信息到屏幕
write(stu, N); // 输出考试通过的考生信息到文件
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;
}
while (!feof(fin)) {
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);
}
// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
void write(STU s[], int n) {
int i;
FILE* fp;
fp = fopen("list_pass.txt", "w");
if (!fp) {
printf("fail to open file to write\n");
return;
}
fprintf(fp,"准考证号\t\t姓名\t\t客观题得分\t\t操作题得分\t\t总分\t\t结果\n");
for (i = 0; i < n; ++i)
{
if (s[i].sum >= 60)
{
fprintf(fp, " %ld\t\t % s\t\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].result);
}
}
fclose(fp);
}
// 对考生信息进行处理:计算每位考生考试总分、结果;统计考试通过的人数
int process(STU st[], int n, STU st_pass[]){
int i, j = 0;
for (i = 0; i < n; ++i) {
st[i].sum = st[i].objective + st[i].subjective;
if (st[i].sum >= 60) {
strcpy(st[i].result, "通过");
j = j + 1;
}
else
strcpy(st[i].result, "不通过");
}
return j;
}
`
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实验任务6
task6.c
`#include <stdio.h>
include <stdlib.h>
include <time.h>
define N 80
int main() {
int luck_index;
char info[N][80];
int f[5] = {0};
FILE* fp;
fp = fopen("list.txt", "r");
if (!fp) {
printf("fail to open file to read\n");
return 1;
}
for (int i = 0; i < N; ++i)
fgets(info[i], 80, fp);
fclose(fp);
srand(time(NULL));
printf("-----------中奖名单-----------\n");
for (int i = 0; i < 5; ++i) {
luck_index = rand() % 81;
int p = 0;
for (int j = 0; j < i; ++j) {
if (f[j] == luck_index) {
p = 1;
break;
}
}
if (!p) {
f[i] = luck_index;
}
printf("%s", info[luck_index]);
}
printf("-------------保存到文件-------------\n");
printf("输入文件名:");
char name[N];
scanf("%s", name);
fp = fopen(name,"w");
if (!fp){
printf("fail to write\n");
return 1;
}
for (int i = 0; i < 5; ++i) {
fprintf(fp,"%s",info[f[i]]);
}
printf("保存成功");
fclose(fp);
return 0;
}
`
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