C 代码不显示在输出零号中

Question

当我编译以下源代码时，输出中的零显示不正确。为什么？我希望输出文本具有以下格式：

01 02 03 04
05 06 07 08

不是 1 2 3 4....

我该如何解决这个问题？

#include "stdio.h"

int main(int argc, char const *argv[])
{
    int a[3][4] = {  
    {00, 01, 02, 03} ,   /*  initializers for row indexed by 0 */
    {04, 05, 06, 07} ,   /*  initializers for row indexed by 1 */
    {08, 09, 10, 11}   /*  initializers for row indexed by 2 */
    };

    for (int i = 0; i < 3; ++i)
    {
        for (int t = 0; t < 4; ++t)
        {
            printf("%d\t", a[i][t] );
        }
        printf("\n");
    }
    return 0;
}

Answer 1

0 在数字之前告诉编译器，这个数字是八进制的。您不能对数字执行此操作，只能对字符或 printf 中的正确格式执行此操作。实际上你的代码是不正确的，不应该编译，因为八进制中没有数字 8 和 9。

Answer 2

勾选 printf manual page

查找填充为 0:

0

The value should be zero padded. For d, i, o, u, x, X, a, A, e, E, f, F, g, and G conversions, the converted value is padded on the left with zeros rather than blanks. If the 0 and - flags both appear, the 0 flag is ignored. If a precision is given with a numeric conversion (d, i, o, u, x, and X), the 0 flag is ignored. For other conversions, the behavior is undefined.

并查找字段宽度：

The field width

An optional decimal digit string (with nonzero first digit) specifying a minimum field width. If the converted value has fewer characters than the field width, it will be padded with spaces on the left (or right, if the left-adjustment flag has been given). Instead of a decimal digit string one may write "*" or "*m$" (for some decimal integer m) to specify that the field width is given in the next argument, or in the m-th argument, respectively, which must be of type int. A negative field width is taken as a '-' flag followed by a positive field width. In no case does a nonexistent or small field width cause truncation of a field; if the result of a conversion is wider than the field width, the field is expanded to contain the conversion result.

解决方案使用：

printf("%02d\b", a[i][t]);

并从文字 (01, 02...) 中删除 0，否则它们将被视为八进制数。

C 代码不显示在输出零号中

C code doesn't show in the output zero number

c++

formatting