#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
float x;
float y;
printf("Please input a num: \n");
scanf("%f",&x);
if( x < 2) {
y = x*x;
}
else if((x >= 2) && (x < 10)) {
y = 2*x - 1;
}
else{
y = 10 + sqrt(x);
}
printf("y = %f\n", y);
return 0;
}