TASK 4
#include<stdio.h>
int main()
{
int cnt=0;
char c;
FILE *fp;
fp = fopen("data4.txt","r");
if(fp == NULL){
printf("fail to open the file\n");
return 1;
}
while((c=fgetc(fp)) != EOF){
if(c != ' ' && c != '\n' && c != '\t'){
cnt++;
}
}
fclose(fp);
printf("data.txt中共包含字符数(不计空白符): %d\n",cnt);
return 0;
}
TASK 5
#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; // 总分
char ans[10]; // 考试结果
} STU;
// 函数声明
void finput(STU st[], int n);
void foutput(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);
finput(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_pass, cnt); // 输出到屏幕
foutput(stu_pass, cnt); // 输出到文件
pass_rate = 1.0 * cnt / N;
printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);
return 0;
}
// 把通过考试的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].ans);
}
// 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 finput(STU st[], 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", &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 foutput(STU s[], int n) {
FILE *fout;
int i;
// 保存到文件
fout = fopen("list_pass.txt", "w");
if (!fout) {
printf("fail to open or create list_pass.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结果\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].ans);
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[]) {
int i,j=0;
for(i=0;i<n;i++){
st[i].sum=st[i].subjective + st[i].objective;
if(st[i].sum >= 60){
strcpy(st[i].ans,"pass");
st_pass[j++]=st[i];
}
else
strcpy(st[i].ans,"fail");
}
return j;
}
TASK 6
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#define M 100
#define N 80
typedef struct {
long int id;
char name[10];
char c[20];
}STU;
int main(){
STU st[M];
int i,n;
FILE *fin;
FILE *fp;
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,"%ld %s %s",&st[i].id,st[i].name,st[i].c);
}
fp = fopen("lucky.txt", "wb");
if(fp == NULL) {
printf("fail to open file\n");
return 1;
}
srand(time(0));
for(i=0;i<5;i++){
n=rand()%N;
fprintf(fp,"%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c);
printf("%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c);
}
fclose(fin);
fclose(fp);
return 0;
}
标签:int,printf,st,STU,实验,pass,fin
From: https://www.cnblogs.com/xhzwd/p/18260360