how to find the slope of a line with two points in c
#include<stdio.h>
void main()
{
float x1, y1, x2, y2;
printf("Enter the x of point 1 \n",x1);
scanf("%f",&x1);
printf("Enter the y of point 1 \n",y1);
scanf("%f",&y1);
printf("Enter the x of point 2 \n",x2);
scanf("%f",&x2);
printf("Enter the y of point 2 \n",y2);
scanf("%f",&y2);
float slope = (y2 - y1) / (x2 - x1);
if( x1 == x2 )
{
printf("the slope is undefined");
}
else
{
printf("the slope is %f", slope);
}
}