Distance Formula in my program..... I need help fast!!!

I need help with using the distance formual in my program. I dont know the proper way to use the square root function. I have figured out how too properly input the part of the distance formula that is inside the square root but i do not know how to take the square root of it. Here is my program:

#include <stdio.h>

int main (void)
{
/* X,Y = Coordinates of 1st Plane and A,B= Coordinates of 2nd
Plane*/

int integer; int X,Y,A,B;
float distance;

printf( "Enter the x and y coordinates of the first plane.\n");
scanf( "%d %d", &X, &Y);

printf( "Enter the x and y coordinates of the second plane.\n");
scanf( "%d %d", &A, &B);

distance= ((A-X)*(A-X))+((B-Y)*(B-Y));

printf("The distance is %.2f\n", distance);

return 0;

}

Do i float for distance since i have to include the sqaure root or do i use a double? Will some one please show me the correct way to execute the distance formula? I woule really appreciate it!!!!

Use the sqrt function in math.h. Here's the prototype:

Code:

double sqrt(double x);

Where do i put the code?

Look at this code.

Code:

#include <stdio.h>
#include <math.h>

int main (void) {
     int integer, x1, y1, x2, y2;
     double distance;

     printf( "Enter the x and y coordinates of the first plane.\n");
     if(scanf( "%d %d", &x1, &y1) != 2)
          return -1;
     while(getchar() != '\n');
     printf( "Enter the x and y coordinates of the second plane.\n");
     if(scanf( "%d %d", &x2, &y2) != 2)
          return -1;
     while(getchar() != '\n');
     distance=sqrt((pow((x2-x1), 2))+(pow((y2-y1), 2)));
     printf("The distance is %.2f\n", distance);
     return 0;
}

When you compile, be sure to link with the math library (m).