点击查看代码
#include <stdio.h>
int main() {
int count = 0;
int ch;
FILE *fp;
fp = fopen("data4.txt", "r");
if (fp == NULL) {
printf("fail to open file\n");
return 1;
}
while ((ch = fgetc(fp)) != EOF) {
if (!(ch == ' ' || ch == '\n' || ch == '\t')) {
count++;
}
}
printf("data4.txt中共包含字符数(不记空白符):%d\n", count);
fclose(fp);
return 0;
}
点击查看代码
#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;
STU m;
for(i=0;i<n;i++)
{
st[i].sum = st[i].objective + st[i].subjective;
if(st[i].sum>=60)
strcpy(st[i].ans,"pass");
else
strcpy(st[i].ans,"fail");
}
for(i=0,j=0;i<n;i++)
if(strcmp(st[i].ans,"pass")==0)
{
st_pass[j] = st[i];
j++;
}
return j;
// 待补足
// ×××
}
点击查看代码
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 80
typedef struct {
long num;
char name[20];
char class[20];
}STU;
int main(){
STU stu[N];
int x[5];
int i,j;
int k,t=0;
FILE *fp;
FILE *ptr;
fp=fopen("list.txt","r");
if(fp==NULL){
printf("fail to open \n");
return 1;
}
ptr=fopen("lucky.txt","w");
if(ptr==NULL){
printf("fail to open file\n");
return 1;
}
while(!feof(fp)){
for(i=0;i<N;++i)
fscanf(fp,"%ld %s %s",&stu[i].num ,stu[i].name ,stu[i].class );
}
fclose(fp);
srand(time(NULL));
k = rand() % N;
x[0]=k;
printf("%ld %-10s %-20s\n", stu[k].num, stu[k].name, stu[k].class);
fprintf(ptr, "%ld %-10s %-20s\n", stu[k].num, stu[k].name, stu[k].class);
for (i = 1; i < 5; ++i) {
k = rand() % N;
x[i]=k;
for (j = 0; j < i; ++j) {
if (x[i] == x[j]) {
t=1;
}
}
if(t==0){
printf("%ld %-10s %-20s\n", stu[k].num, stu[k].name, stu[k].class);
fprintf(ptr, "%ld %-10s %-20s\n", stu[k].num, stu[k].name, stu[k].class);
}
if(t==1){
i=i-1;
}
}
fclose(ptr);
return 0;
}