如何通过printf的打印正数为负数 [英] How to print a positive number as a negative number via printf
问题描述
在阅读有关printf()的,我发现,根据需要由用户通过以下code(为 - )可以打印编号为阳性或阴性,但code不工作,输出是一个积极value.Please提到那里的错误is.Thanks
#包括LT&;&stdio.h中GT;
诠释的main()
{
的printf(%-d \\ n,1977年);
返回0;
}
从您的意见看起来你看错此页面。在 -
和 +
符做两件完全不同的事情,而且也不是什么你认为' - '应该做的
正如其他人所指出的那样, -
不离开的理由。在 +
说明打印正数与一个领先的加号(数和负数仍然获得领先的减号):
的printf(%D%+ D%+ D \\ n,10,10,10,10);
输出:
-10 10 -10 +10
块引用>While reading about printf(),I found that it can print numbers as positive or negative as desired by the user by following code(for -).But the code doesnt work and the output is a positive value.Please mention where the error is.Thanks
#include<stdio.h> int main() { printf (" %-d\n", 1977); return 0; }
解决方案From your comments it looks like you misread this page. The
-
and+
specifiers do two completely different things, and neither does what you think '-' should do.As others have noted,
-
does left justification. The+
specifier prints positive numbers with a leading plus sign (and negative numbers still get a leading minus sign):printf("%d %d %+d %+d\n", -10, 10, -10, 10);
outputs:
-10 10 -10 +10
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