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doc: update docs/c.md.

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jaywcjlove 2022-10-13 16:31:20 +08:00
parent 15c899a89f
commit 877a763274
1 changed files with 24 additions and 17 deletions
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docs/c.md
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@ -1063,7 +1063,7 @@ s2 = s1;
### 修改值 ### 修改值
```c ```c {6,7}
// 创建一个结构变量并为其赋值 // 创建一个结构变量并为其赋值
struct myStructure s1 = { struct myStructure s1 = {
13, 'B' 13, 'B'
@ -1117,12 +1117,14 @@ C 库中有许多函数可以`打开`/`读取`/`写入`/`搜索`和`关闭`文
### 打开文件：fopen() ### 打开文件：fopen()
```c ```c {6}
#include<stdio.h> #include<stdio.h>
void main( ) { void main( ) {
FILE *fp; FILE *fp;
char ch; char ch;
fp = fopen("file_handle.c", "r"); fp = fopen("file_handle.c", "r");
while (1) { while (1) {
ch = fgetc(fp); ch = fgetc(fp);
if (ch == EOF) if (ch == EOF)
@ -1137,24 +1139,25 @@ void main( ) {
### 写入文件：fprintf() ### 写入文件：fprintf()
```c ```c {7}
#include <stdio.h> #include <stdio.h>
main() { main() {
FILE *fp; FILE *fp;
fp = fopen("file.txt", "w"); // 打开文件 fp = fopen("file.txt", "w"); // 打开文件
fprintf(fp, "Hello file by fprintf...\n"); // 将数据写入文件 // 将数据写入文件
fprintf(fp, "fprintf 的 Hello 文件..\n");
fclose(fp); // 关闭文件 fclose(fp); // 关闭文件
} }
``` ```
### 读取文件：fscanf() ### 读取文件：fscanf()
```c {6}
```c
#include <stdio.h> #include <stdio.h>
main(){ main(){
FILE *fp; FILE *fp;
char buff[255]; // 创建 char 数组来存储文件数据 char buff[255]; // 创建char数组存储文件数据
fp = fopen("file.txt", "r"); fp = fopen("file.txt", "r");
while(fscanf(fp, "%s", buff)!=EOF) { while(fscanf(fp, "%s", buff)!=EOF) {
printf("%s ", buff); printf("%s ", buff);
@ -1165,8 +1168,9 @@ main(){
### 写入文件：fputc() ### 写入文件：fputc()
```c ```c {6}
#include <stdio.h> #include <stdio.h>
main(){ main(){
FILE *fp; FILE *fp;
fp = fopen("file1.txt", "w"); // 打开文件 fp = fopen("file1.txt", "w"); // 打开文件
@ -1177,7 +1181,7 @@ main(){
### 读取文件：fgetc() ### 读取文件：fgetc()
```c ```c {8}
#include<stdio.h> #include<stdio.h>
#include<conio.h> #include<conio.h>
void main() { void main() {
@ -1195,9 +1199,10 @@ void main() {
### 写入文件：fputs() ### 写入文件：fputs()
```c ```c {8}
#include<stdio.h> #include<stdio.h>
#include<conio.h> #include<conio.h>
void main(){ void main(){
FILE *fp; FILE *fp;
clrscr(); clrscr();
@ -1210,10 +1215,10 @@ void main(){
### 读取文件：fgets() ### 读取文件：fgets()
```c {10}
```c
#include<stdio.h> #include<stdio.h>
#include<conio.h> #include<conio.h>
void main() { void main() {
FILE *fp; FILE *fp;
char text[300]; char text[300];
@ -1228,13 +1233,14 @@ void main() {
### fseek() ### fseek()
```c ```c {8}
#include <stdio.h> #include <stdio.h>
void main(){ void main(){
FILE *fp; FILE *fp;
fp = fopen("myfile.txt","w+"); fp = fopen("myfile.txt","w+");
fputs("This is Book", fp); fputs("This is Book", fp);
// 将文件指针设置到给定位置
fseek(fp, 7, SEEK_SET); fseek(fp, 7, SEEK_SET);
fputs("Kenny Wong", fp); fputs("Kenny Wong", fp);
fclose(fp); fclose(fp);
@ -1245,7 +1251,7 @@ void main(){
### rewind() ### rewind()
```c ```c {11}
#include<stdio.h> #include<stdio.h>
#include<conio.h> #include<conio.h>
void main(){ void main(){
@ -1269,9 +1275,10 @@ void main(){
### ftell() ### ftell()
```c ```c {11}
#include <stdio.h> #include <stdio.h>
#include <conio.h> #include <conio.h>
void main (){ void main (){
FILE *fp; FILE *fp;
int length; int length;
@ -1279,7 +1286,7 @@ void main (){
fp = fopen("file.txt", "r"); fp = fopen("file.txt", "r");
fseek(fp, 0, SEEK_END); fseek(fp, 0, SEEK_END);
length = ftell(fp); length = ftell(fp); // 返回当前位置
fclose(fp); fclose(fp);
printf("文件大小: %d bytes", length); printf("文件大小: %d bytes", length);