Read a weight in kilograms and a height in meters, both as decimals, using scanf("%f %f", ...). Compute the BMI as weight / (height * height) and print its category with no trailing newline:

BMI below 18.5 prints Underweight.
BMI below 25 prints Normal.
BMI below 30 prints Overweight.
Otherwise prints Obese.

For input 50 1.75 the output is Underweight; for 70 1.75 it is Normal; for 100 1.75 it is Obese.