c语言描述一块钱可以换的零钱

请大神帮忙看一下为什么运行结果是这样

代码如下：

int main()
{
    for(int i=0; i<=10; ++i) {
        for(int j=0; j<=5; ++j) {
            for(int k=0; k<=2; ++k) {
                if(i*0.1 + j*0.2 + k*0.5 == 1.0) //if( ((i*0.1 + j*0.2 + k*0.5) > 0) && ((i*0.1 + j*0.2 + k*0.5)-0.1 < 0.00001))
                    cout << "一毛：" << i << "," << "两毛：" << j << "," << "五毛：" << k << endl;
            }
        }
    }
    return 0;
}