一次用空格读取一个字符的文件

时间:2019-02-20 14:14:50

标签: c file line-breaks spaces fgetc

我正在尝试将文件中的大小写转换为另一个文件。我要转换的文件有空格和几行。转换后的表格没有空格且没有换行符。有谁知道我该如何更改代码,使其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;
}

1 个答案:

答案 0 :(得分:2)

总体初学者的解决方案:

...
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);
...

解决方案较短,但对于初学者来说更难阅读和理解。