in C Write a program to read in from keyboard two points (x1, y1) and (x2, y2). x1, y1, x2, y2 should have type double. Calculate and print out the distance between the two points. Please print out the distance to only four digits after the decimal (see Section 2.7 Manipulating floating-point output). The calculation is: Distance = (21)/2 +(21)/2 Please check Section 2.10 for how to use the math functions sqrt, pow in the standard math library (#include ) to calculate the square root and power.