文件读写方式
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常见C语言的文件读写方式
fopen("*.*","r")
fopen("*.*","r+")
fopen("*.*","rb")
fopen("*.*","rb+")
fopen("*.*","w")
fopen("*.*","w+")
fopen("*.*","wb")
fopen("*.*","wb+")
fopen("*.*","a")
fopen("*.*","a+")
fopen("*.*","ab")
fopen("*.*","ab+")
注释：逗号右边的引号里r表示只读,w只写（会覆盖原内容，如果以前已经存过该文件），a追加，带b的表示以二进制形式读（写），带+的表示可读可写，比如r为只读，r+就是读写。