http://topic.csdn.net/u/20090220/11/951b405d-802c-4266-a0e4-da4f2b0991e9.html
我试图去解决上贴的问题, 失败了:(.
我用模板重写了上贴的可变参数函数, 发现对int, double类型没有问题, 惟独float的结果错误.
不只为何? (编译环境:VC2005)
#include <iostream>
#include <cstdarg>
template <class T>
T sum(int n,T b,...)
{
va_list ap;
T temp;
va_start(ap, b);
T sum1=b;
for(int i=0;i<n-1;i++)
{
temp=va_arg(ap,T);
sum1 += temp;
}
va_end(ap);
return(sum1);
}
int main()
{
int intA = 2;
int intB = 3;
std::cout <<intA<<"+"<<intB<<"="<<sum(2, intA, intB)<<'\n';
double doubleA = 2.2;
double doubleB = 3.3;
std::cout <<doubleA<<"+"<<doubleB<<"="<<sum(2, doubleA, doubleB)<<'\n';
// 下面输出的结果是错误的！！ why?
float floatA = 2.1f;
float floatB = 3.1f;
std::cout <<floatA<<"+"<<floatB<<"="<<sum(2, floatA, floatB)<<'\n';
return 0;
}
