将字符保存到文件 [英] Saving a character to a file

问题描述

#include<stdio.h>


void read()

{

int i=0 , j=0;
char s[10];

    FILE *fp ;

fp = fopen ( "sig.c" , "w+" );

    if (fp==NULL)
    {fputs("File error",stderr); exit (1);}


  fgets (s , 10 , fp) ;

 printf("%s \n",s);


fclose(fp);


}




void write()

{
char x1[10] ;

int i =0 ;
char c = "";

FILE *fp;
fp=fopen("sig.c", "wb");

for (i=0 ; i< 10 ;i++)

{

x1[i] = scanf("%c" , &c);
}

char x="f" ,
x2 = "";

for (i=0 ; i< 10 ;i++)

{

x2 = x1[i];

fwrite(&x2, sizeof(x2) , x ,fp);
}


fclose(fp);

}


void  main()

{
    write();

    read();


}

在read func中打印时，此项目错误.为什么代码不将输入的字符复制到sig.txt

This project error when print s in read func. Why does the code not copy the entered char to sig.txt

推荐答案

以"r"模式而不是"w +"模式在读取函数中打开文件.模式"w +"将删除文件的内容(如果存在).那不是你想要的.

x2在您的写入函数中未定义，因此我假设您粘贴了一个简化的副本，但不幸的是它无法编译.

我建议您进行适当的缩进，如果不是为了您自己，那么至少要为阅读程序的其他人使用.

Open the file in your read function with mode "r" instead of "w+". The mode "w+" will delete the contents of your file if it exists. That is not what you want.

x2 is nowhere defined in your write function, so I assume you pasted a simplified copy, which unfortunately does not compile.

I would recommend working with proper indenting, if not for yourself, then at least for others who read your programs.

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