How can I write code in C for the following problem If range

How can I write code in C for the following problem?

If range = 0.1, 0.2, 0.3 .... 0.9 ;
do smth;

If range = 0.01, 0.02, 0.03 .... 0.99;
do smth;

If range = 0.001, 0.002, 0.003 .... 0.999;
do smth;

But output of the program must be just

What is the range?

Hi, Please let me know in case of any issue.

#include <stdio.h>

int main(){

// declaration of range variable
double range = 0.05;

//1
if(range >= 0.1 && range <= 0.9){

//do smth;
}

//2
if(range >= 0.01 && range <= 0.99){

//do smth;
}

//3
if(range >= 0.001 && range <= 0.999){

//do smth;
}

return 0;
}

/*
What is the range?

\'range\' is a variable of type double;