分段函数求值
#include <stdio.h>
int main()
{
double x, y;
while(scanf("%lf",&x)!=EOF)
{
if(x > 0)
{
y = x * x + 1;
}
else if(x < 0)
{
y = -x;
}
else if(x == 0)
{
y = 100.0;
}
printf("%.1lf\n",y);
}
return 0;
}