求助VC++编程困惑
我的C++安装为什么不能正常运行，程序以及运行结果如下：
#include<iostream.h>
void main()
{
double r,area;
cout<<"banjing:";
cin>>r;
area=3.14*r*r;
cout<<"mianji:"<<area<<"\n";
}
结果：
--------------------Configuration: Cpp1 - Win32 Debug--------------------
Cannot start tool.
操作成功完成。
Cannot start tool.
Error spawning 'vcspawn.exe'. The build could not be performed.
Cpp1.obj - 1 error(s), 0 warning(s)
