print solution (new to C) -

i cant figure out why program wont print final solution (totaldough). inputs 8,10,12 40,100 , 200:

const int dough_per_sqft = 0.75; const int inches_per_feet = 12; #define m_pi 3.14159265358979323846  int main(){      // declare , initialize variables      int smallrin;     printf("what radius of small pizza, in inches?\n");     scanf("%d", &smallrin);     int mediumrin;     printf("what radius of medium pizza, in inches?\n");     scanf("%d", &mediumrin);     int largerin;     printf("what radius of large pizza, in inches?\n");     scanf("%d", &largerin);       // number of pizzas sold     int smallsold;     printf("how many small pizzas expect sell week?\n");     scanf("%d", &smallsold);     int mediumsold;     printf("how many medium pizzas expect sell week?\n");     scanf("%d", &mediumsold);     int largesold;     printf("how many large pizzas expect sell week?\n");     scanf("%d", &largesold);      // convert radii feet      double smallrfeet, mediumrfeet, largerfeet;     smallrfeet = smallrin/inches_per_feet;     mediumrfeet = mediumrin/inches_per_feet;     largerfeet = largerin/inches_per_feet;      // calculate top surface areas of each type of pizza.      double areasmall, areamedium, arealarge;     areasmall = smallsold*m_pi*pow(smallrfeet,2);     areamedium = mediumsold*m_pi*pow(mediumrfeet,2);     arealarge = largesold*m_pi*pow(largerfeet,2);      // print solution     double dough;     dough = areasmall+areamedium+arealarge;     double total_dough;     total_dough = dough * dough_per_sqft;      printf("the total amount of dough need order week is", total_dough);      return 0; } 

what doing wrong?

const int dough_per_sqft = 0.75; 

this of value int , int's not floating-point numbers, translates to:

0 

this means in final equation

total_dough = dough * dough_per_sqft; 

it evaluate 0 because dough per sqft equal 0.

this can corrected changing:

const int dough_per_sgft = 0.75 

into:

const double dough_per_sgft = 0.75