sprintf的：在C双键precision [英] sprintf : double precision in C

问题描述

double a = 0.0000005l;
char aa[50];
sprintf(aa,"%lf",a);
printf("%s",aa);

Output:s0.000000

在上面的code片段中，变量AA只能包含6个小数precision。我想获得一个输出s0.0000005。
能否请你指点我如何实现这一目标？
谢谢

In the above code snippet, the variable aa can contain only 6 decimal precision. I would like to get an output "s0.0000005". Could you please advice me on how to achieve this? Thanks

推荐答案

从你的问题好像你正在使用C99，因为你已经使用％LF 双。

From your question it seems like you are using C99,as you have used %lf for double.

要实现所需的输出替换

sprintf(aa,"%lf",a);

与

sprintf(aa, "%0.7f", a);

一般语法％A·B表示小数点后用B钮数字。在 A 比较复杂，但是，可读取的>。

The general syntax "%A.B" means to use B digits after decimal point. The meaning of the A is more complicated, but can be read about here.

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