在这里我们将看到一些在C语言中的基本文件处理操作。以下是这些操作的列表：
向文件中写入内容从文件中读取内容在文件中追加内容
向文件中写入内容
请参考以下代码以了解如何向文件中写入内容
示例代码
#include int main() { FILE *fp; char *filename = "sample.txt"; char *content = "Hey there! You've successfully created a file with content in c programming language."; /* open for writing */ fp = fopen(filename, "w"); if( fp == NULL ) { printf("%s: failed to open. ", filename); return -1; } else { printf("%s: opened in write mode.
", filename); } /* Write content to file */ fprintf(fp, "%s
", content); if( !fclose(fp) ) printf("%s: closed successfully.
", filename); return 0;}
登录后复制
输出
sample.txt: opened in write mode.sample.txt: closed successfully.
登录后复制
2.从文件中读取
查看代码以了解我们如何从文件中读取创建一个文件（file_read.txt）：
您使用C编程语言打开了一个只读模式的文件。
示例代码
#include int main() { FILE *fp; char *filename = "file_read.txt"; char ch; /* open for writing */ fp = fopen(filename, "r"); if (fp == NULL) { printf("%s does not exists ", filename); return; } else { printf("%s: opened in read mode.
", filename); } while ((ch = fgetc(fp) )!= EOF) { printf ("%c", ch); } if (!fclose(fp)) printf("
%s: closed.
", filename); return 0;}
登录后复制
输出
file_read.txt: opened in read mode.You have opened a file using C programming language, in read-only mode.file_read.txt: closed.
登录后复制
3.将内容追加到文件中
查看代码以了解如何将行追加到文件中的方法。
创建文件（file_append.txt）
This text was already there in the file.
登录后复制
示例代码
#include int main() { FILE *fp; char ch; char *filename = "file_append.txt"; char *content = "This text is appeneded later to the file, using C programming."; /* open for writing */ fp = fopen(filename, "r"); printf("Contents of %s -
", filename); while ((ch = fgetc(fp) )!= EOF) { printf ("%c", ch); } fclose(fp); fp = fopen(filename, "a"); /* Write content to file */ fprintf(fp, "%s
", content); fclose(fp); fp = fopen(filename, "r"); printf("
Contents of %s -
", filename); while ((ch = fgetc(fp) )!= EOF) { printf ("%c", ch); } fclose(fp); return 0;}
登录后复制
输出
Contents of file_append.txt -This text was already there in the file.Appending content to file_append.txt...Content of file_append.txt after 'append' operation is -This text was already there in the file.This text is appeneded later to the file, using C programming.
登录后复制
以上就是C 文件处理基础知识的详细内容，更多请关注【创想鸟】其它相关文章！
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容， 请发送邮件至253000106@qq.com举报，一经查实，本站将立刻删除。
发布者：PHP中文网，转转请注明出处：https://www.chuangxiangniao.com/p/2581464.html
