051分段函数

大家好,乐天来为大家解答以下的问题，关于051分段函数这个很多人还不知道,现在让我们一起来看看吧！

1、//if()实现#include#includevoid main(){    double x,y;    cout<<"Enter X:";    cin>>x;    if(x<0)//永远二分        cout<<"No defination";    else    {   if(x<10)            y=sin(x);        else            if(x<20)                y=cos(x);            else                if(x<30)                    y=log(x+1);//ln(x+1)                else                    if(x<40)                        y=-0.5*x;                    else                        cout<<"No defination";    }    if(x>=0&&x<40)        cout<<"y="<#includevoid main(){    double x,y;    cout<<"Enter X:";    cin>>x;    switch(int(x/10))//注意这里的技巧    {    case 0:y=sin(x);cout<<"y="<

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