no matching symbolic information found

#include<iostream>
using namespace std;
void sphere();
void spx();
int main()
{
//sphere();
spx();
return 0;
}
void sphere()
{
double radius;
cout<<"Please input radius:";
cin>>radius;
if (radius<0) return;
cout<<"The result is "<<radius*radius*3.14*4<<"/n";
}
void spx()
{
for (int x=1;x<=10;++x)
{
for (int y=1 ;y<=x;++y)
{
cout<<"*";
}
cout<<"/n";
}
}

Loaded 'ntdll.dll', no matching symbolic information found.

Loaded 'C:/WINDOWS/system32/kernel32.dll', no matching symbolic information found.

Loaded 'C:/WINDOWS/system32/shimeng.dll', no matching symbolic information found.

The thread 0xDD4 has exited with code 0 (0x0).

The program 'D:/960174/MY DOCUMENTS/VC/ex/Debug/ex.exe' has exited with code 0 (0x0).

录入完成后,按 F5 运行程序,可是却显示不出结果,

程序本身并没有错,为什么会报错呢,

经过分析:原来是程序没有重新编译所致,按 F7重新编译后,F5 可以正常执行.