Question

我有以下C程序：

#include <stdio.h>

int main()
{
    FILE *f1, *f2, *f3;
    int number, i;

    printf("Contents of data file\n\n");

    f1=fopen("DATA", "w");

    for(i=1; i<=10; i++)
    {
        scanf("%d", &number);

        if(number==-1)
        {
            break;
        }

        putw(number,f1);
    }
    fclose(f1);
    f1=fopen("DATA","r");
    f2=fopen("ODD","w");
    f3=fopen("EVEN","w");

    while((number=getw(f1)) != EOF)
    {
        if(number%2==0)
        {
            putw(number,f3);
        }

        else
        {
            putw(number,f2);
        }
    }

    fclose(f1);
    fclose(f2);
    fclose(f3);

    f2=fopen("ODD","r");
    f2=fopen("EVEN","r");

    printf("Contents on ODD file:");
    while((number=getw(f2)) != EOF)
    {
        printf("%4d", number);
    } 

    printf("Contents on EVEN file:");
    while((number=getw(f3)) != EOF)
    {
        printf("%4d", number);
    }

    fclose(f2);
    fclose(f3);

    return 0;

}

此程序无限输入 FILE f1 。按 -1 后应终止。但它不！我按了CTRL+D。但什么都没发生。我不明白问题出在哪里。

Answer 1

我猜你的意思是

(number=getw(f1))

而不是

(number==getw(f1))

你的程序将以这种方式永远循环你的第一个while子句。

您应该使用"wb"和"rb"而不是"w"和"r"打开文件，因为putw()和getw()都期望以二进制模式打开的文件。

Answer 2

我尝试了相同的代码并进行了一些小的更正，如果有用的话，它可以正常运行：

int main()
{
 FILE *f1, *f2, *f3;
int number, i;

printf("Contents of data file\n\n");

f1=fopen("DATA", "w");

for(i=1; i<=10; i++)
{
    scanf("%d", &number);

    if(number==-1)
    {
        break;
    }

    putw(number,f1);
}
fclose(f1);
f1=fopen("DATA","r");
f2=fopen("ODD","w");
f3=fopen("EVEN","w");

while((number=getw(f1)) != EOF)
{
    if(number%2==0)
    {
        putw(number,f3);
    }

    else
    {
        putw(number,f2);
    }
}

fclose(f1);
fclose(f2);
fclose(f3);

f2=fopen("ODD","r");
f3=fopen("EVEN","r");

printf("Contents on ODD file:");
while((number=getw(f2)) != EOF)
{
    printf("%4d", number);
} 

printf("Contents on EVEN file:");
while((number=getw(f3)) != EOF)
{
    printf("%4d", number);
}

fclose(f2);
fclose(f3);

return 0;

}

Answer 3

你写过

f2=fopen("ODD","r");
f2=fopen("EVEN","r");

但应该写

f2=fopen("ODD","r");
f3=fopen("EVEN","r");

无论如何，希娜已经纠正了这个......应该用f3指出偶数流

文件无限输入

3 个答案: