使用空格一次读取一个文件

Question

我正在尝试将案例从文件转换并写入另一个文件。我要转换的文件有空格和几行。转换后的表格没有空格和换行符。有谁知道我如何更改我的代码，以便它包含原始文件中的空格和换行符？

#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>

int main(void)
{
FILE *fp1, *fp2;
fp1 = fopen("exercise2.txt", "r");
fp2 = fopen("exercise2_converted.txt", "w");

int singleline;

if (fp1 == NULL)
{
    printf("Error opening fp1!\n");
    return 0;
}
if (fp2 == NULL)
{
    printf("Error opening fp2!\n");
    fclose(fp1);
    return 0;
}

do
{
    singleline = fgetc(fp1);
    if (islower(singleline))
    {
        singleline = toupper(singleline);
        fputc(singleline, fp2);
    }
    else if (isupper(singleline))
    {
        singleline = tolower(singleline);
        fputc(singleline, fp2);
    }
} while (singleline != EOF);


fclose(fp1);
fclose(fp2);

return 0;
}

Answer 1

初学者的整体解决方案：

...
do
{
    singleline = fgetc(fp1);
    if (singleline == EOF)
      break;        // end of file => game over quit loop immediately

    // convert char if neessary
    if (islower(singleline))
    {
        singleline = toupper(singleline);
    }
    else if (isupper(singleline))
    {
        singleline = tolower(singleline);
    }

    // output the char
    fputc(singleline, fp2);
} while (1);
...

有更短的解决方案，但对于初学者来说更难阅读和理解。

使用空格一次读取一个文件

reading a file one character at a time with spaces

c

file

line-breaks

spaces

fgetc