double输出格式是%lf吗？

%f

float也是%f,这两种就没区别了~~

lf

到底应该是怎样呢?

lf，用f会丢失掉精度~~~~~

%f or %lf 都可以



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No, simply f, Neither lf nor Lf:

For printf():

l: The argument is interpreted as a long int or unsigned long int for integer specifiers (i, d, o, u, x and X), and as a wide character or wide character string for specifiers c and s.
L: The argument is interpreted as a long double (only applies to floating point specifiers: e, E, f, g and G).

For scanf():

l : long int (for d, i and n), or unsigned long int (for o, u and x), or double (for e, f and g)
L : long double (for e, f and g)

版主,我看得不很明白,但是在下面这个程序中:
#include<stdio.h>
main()
{
double t;
scanf("%f",&t);
printf("%f",t);
}
//输入1,结果 -92559604281615349000000000000000000000000000000000000000000000.000000
改为:scanf("%lf",&t);就OK了.为什么?

因为你定义的是double类型的