在 C/C++ 中打印前导空格和零 [英] Printing leading spaces and zeros in C/C++

问题描述

我需要在数字前打印一些前导空格和零，以便输出如下所示:

I need to print some leading spaces and zeros before a number, so that the output will be like this:

00015
   22
00111
    8
  126

这里，当数字为偶数和前导零时，我需要打印前导空格odd

here, I need to print leading spaces when the number is even and leading zero when odd

我是这样做的:

int i, digit, width=5, x=15;

if(x%2==0)  // number even
{
    digit=log10(x)+1;  // number of digit in the number
    for(i=digit ; i<width ; i++)
      printf(" ");
    printf("%d\n",x);
}
else       // number odd
{
    digit=log10(x)+1;  // number of digit in the number
    for(i=digit ; i<width ; i++)
      printf("0");
    printf("%d\n",x);
}

有没有什么捷径可以做到这一点?

Is there any shortcut way to do this ?

推荐答案

要打印前导空格和零，您可以使用:

int x = 119, width = 5;

// Leading Space
printf("%*d\n",width,x);

// Leading Zero
printf("%0*d\n",width,x);

所以在你的程序中只需改变这个:

So in your program just change this :

int i, digit, width=5, x=15;

if(x%2==0)  // number even
    printf("%*d\n",width,x);
else        // number odd
    printf("%0*d\n",width,x);

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