实验4
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
signed main() {
FILE *fp;
fp=fopen("data4.txt","r");
if(fp==NULL){
printf("fail to open file to read\n");
return 0;
}
int n=0,nl=0;
char c=fgetc(fp);
while(c!=EOF){
// putchar(c);
if(c=='\n'){
nl++;
}else{
if(c!=' '&&c!=EOF){
n++;
}
}
c=fgetc(fp);
}
fclose(fp);
// printf("\n");
printf("行数:%d\n",nl+1);
printf("字符数(不计空白字符):%d\n",n);
return 0;
}
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实验5
#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;
}
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) {
// 待补足
// xxx
FILE *fout;
fout=fopen("list_pass.txt","w");
if(fout==NULL){
printf("fail to open file to write\n");
return;
}
fprintf(fout,"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(int i=0;i<n;i++){
if(strcmp(s[i].result,"通过")==0){
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].result);
}
}
fclose(fout);
}
// 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[]) {
// 待补足
// xxx
FILE *f;
int count=0;
f=fopen("examinee.txt","r");
if(f==NULL){
printf("fail to open file\n");
return 0;
}
for(int 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");
count++;
}
else{
strcpy(st[i].result,"不通过");
}
}
fclose(f);
return count;
}
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实验6
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
struct Stu{
long id;
char name[100];
char class[100];
}a[114514],b[114514];
int h[114514];
signed main() {
srand((unsigned int)time(NULL));
time_t rawtime;
struct tm * timeinfo;
time(&rawtime);
timeinfo = localtime(&rawtime);
char str[20];
strftime(str, sizeof(str),"%Y%m%d.txt",timeinfo);
FILE *fin, *fout;
fout=fopen(str,"w");
fin=fopen("list.txt","r");
int i=0;
while(fscanf(fin,"%ld %s %s",&a[i].id,a[i].name,a[i].class)!=EOF){
i++;
}
int n=i;
for(int j=1;j<=5;){
int t=rand()%n;
while(!h[t]){
h[t]=1;
b[j++]=a[t];
}
t=rand()%n;
}
for(int j=1;j<=5;j++){
for(int k=j+1;k<=5;k++){
if(b[j].id>b[k].id){
struct Stu t=b[j];
b[j]=b[k];
b[k]=t;
}
}
}
fclose(fin);
printf("----------%s中奖名单----------\n",str);
printf("准考证号\t姓名\t班级\n");
for(int j=1;j<=5;j++){
printf("%ld\t%s\t%s\n",b[j].id,b[j].name,b[j].class);
}
fprintf(fout,"----------%s中奖名单----------\n",str);
fprintf(fout,"准考证号\t姓名\t班级\n");
for(int j=1;j<=5;j++){
fprintf(fout,"%ld\t%s\t%s\n",b[j].id,b[j].name,b[j].class);
}
fclose(fout);
printf("\n文件保存成功!\n");
return 0;
}
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