在C中打印前导0 [英] Printing leading 0's in C

问题描述

我正在尝试找到一种打印前导 0 的好方法，例如

I'm trying to find a good way to print leading 0, such as 01001 for a ZIP Code. While the number would be stored as 1001, what is a good way to do it?

我想到了使用 case 语句或 if 找出数字是多少位数，然后将其转换为 char 数组带有额外的 0 进行打印，但是我不禁想到，可能有一种方法使 printf 格式的语法难以理解.

I thought of using either case statements or if to figure out how many digits the number is and then convert it to an char array with extra 0's for printing, but I can't help but think there may be a way to do this with the printf format syntax that is eluding me.

推荐答案

printf("%05d", zipCode);

0 表示要填充的内容， 5 表示整数的宽度.

The 0 indicates what you are padding with and the 5 shows the width of the integer number.

示例1:如果使用％02d" (对日期有用)，则只会在一"列中填充数字零.例如 06 而不是 6 .

Example 1: If you use "%02d" (useful for dates) this would only pad zeros for numbers in the ones column. E.g., 06 instead of 6.

示例2:％03d" 将在one列中填充2个零以表示一个数字，在tens列中填充1个零以表示一个数字.例如，将7号填充到 007 中，将17号填充到 017 中.

Example 2: "%03d" would pad 2 zeros for one number in the ones column and pad 1 zero for a number in the tens column. E.g., number 7 padded to 007 and number 17 padded to 017.

这篇关于在C中打印前导0的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！