#include<math.h>
#define e 2.718281828459
double Fun(int x);
int main()
{
int x;
scanf("%d",&x);
printf("%ld\n",Fun(x));
return 0;
}
double Fun(int x)
{
if(x>0)
return 2*x-pow(e,2);
else if(x<0)
return 3*pow(x,2)-2;
else
return sqrt(5);
}
刚手打的，还没有运行，自己再运行一下，给分，亲！
{
int y =0;
if(x>0){
return y = 2*x-exp(2);
}
if(x<0){
return y = 3*pow(x,2)-2;
}
return y = sqrt(5);
}
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