C Program to Accept a Page number and Display the chapter number

A book has 20 chapters and every chapter has 30 pages each, write a program to accept a page number and display the chapter number.

Input 45
Output 2

Input 90
Output 3

Input 600
Output 20

Input 610
Output -1


#include<stdio.h> #include<math.h> int main(){ float z,a,n; scanf("%f",&n); z=n/20; if(n<=30) printf("%.f",floor(z)); else if (n>600) printf("-1"); else printf("%.f",ceil(z)); return 0; }
Code language: C/AL (cal)

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