z****e
发帖数: 2024 | 1 #include
#include
#include
using namespace std;
后面用了abs（）
error: call of overloaded ‘abs(double)’ is ambiguous
/usr/include/stdlib.h:691: note: candidates are: int abs(int)
没办法，把using namespace std;去掉，然后一个一个的using。编译通过了。
我估计是用了stdlib里边的abs，但是精度太差了。
怎么调用一个take double 的abs（） 呢？ |
N***m
发帖数: 4460 | 2 fabs()?
【在 z****e 的大作中提到】
: #include
: #include
: #include
: using namespace std;
: 后面用了abs（）
: error: call of overloaded ‘abs(double)’ is ambiguous
: /usr/include/stdlib.h:691: note: candidates are: int abs(int)
: 没办法，把using namespace std;去掉，然后一个一个的using。编译通过了。
: 我估计是用了stdlib里边的abs，但是精度太差了。
: 怎么调用一个take double 的abs（） 呢？
|
z****e
发帖数: 2024 | 3 Thanks！！！
久违的记忆深处，这个函数终于开始闪闪发光。
【在 N***m 的大作中提到】
: fabs()?
|
t****t
发帖数: 6806 | 4 abs(int) is declared in stdlib.h (); while fabs(double) and
additional overloaded abs(double) is declared in math.h ().
if you want abs(int), but include only without , then
compiler won't know how to convert int to double/float/long double.
on the other hand, if you want abs(double) but you include only
without , compiler won't know how to convert double to int/long/long
long.
so make sure you included what you need.
【在 z****e 的大作中提到】
: #include
: #include
: #include
: using namespace std;
: 后面用了abs（）
: error: call of overloaded ‘abs(double)’ is ambiguous
: /usr/include/stdlib.h:691: note: candidates are: int abs(int)
: 没办法，把using namespace std;去掉，然后一个一个的using。编译通过了。
: 我估计是用了stdlib里边的abs，但是精度太差了。
: 怎么调用一个take double 的abs（） 呢？
|
t******s
发帖数: 119 | 5 zan!
long
【在 t****t 的大作中提到】
: abs(int) is declared in stdlib.h (); while fabs(double) and
: additional overloaded abs(double) is declared in math.h ().
: if you want abs(int), but include only without , then
: compiler won't know how to convert int to double/float/long double.
: on the other hand, if you want abs(double) but you include only
: without , compiler won't know how to convert double to int/long/long
: long.
: so make sure you included what you need.
|
z****e
发帖数: 2024 | 6 mater shifu: xin ku le.
long
【在 t****t 的大作中提到】
: abs(int) is declared in stdlib.h (); while fabs(double) and
: additional overloaded abs(double) is declared in math.h ().
: if you want abs(int), but include only without , then
: compiler won't know how to convert int to double/float/long double.
: on the other hand, if you want abs(double) but you include only
: without , compiler won't know how to convert double to int/long/long
: long.
: so make sure you included what you need.
|
