Hello
I’ve been working on an assignment for class where we are supposed to calculate a water bill. I’ve come up with a solution that compiles with out any warnings and works just as expected, except for the math results. When multiplying my variable _rate by 0.55 it appears to multiply by 0.715. If I change this to 0.5 it looks like 0.65.
If anyone can explain what I've done wrong it would be much appreciated.
Code:/* Assignment 2. Lab_2_Q1.c Program Name: Water Bill Description: This program prompts for user input of a single digit and display text string with input. Variables: _account = Costomer acount number _old = Old water meter reading _new = New Water meter reading _use = The amount if water used between readings _bill = The amount of the bill for water use Includes: stdio.h Constants: None */ #include <stdio.h> //Proccessor Directive int main () //Main Function { long _account, _old, _new, _use, _rate; //Variables float _bill; printf("Enter the Costomers Account number for\nfor water bill:> "); scanf("%li", &_account); //Prompt user for account number printf("Enter the previous water meter reading:> "); //Enter old reading scanf("%li", &_old); printf("Enter the new meter reading:> "); //Enter new reading scanf("%li", &_new); _use = _new - _old; //calculate water used _rate = _use / 1000; //calculate rate catagory printf("_rate = %li\n", _rate); printf("_use modulus 1000 = %li\n", (_use % 1000)); if (_use % 1000 != 0) //round up for part of 1000L { _rate =+ 1; } printf("_rate = %li\n", _rate); if ( 0 <= _rate <= 25) //Customer has no penalty _bill = 30 + (_rate * 0.55); if ( 25 < _rate <= 50) //Customer has 10% penalty _bill = 30 + (_rate * 0.55) * 1.1; if (50 < _rate <= 75) //Costomer has 20% penalty _bill = 30 + (_rate * 0.55) * 1.2; if (75 < _rate <= 100) //Costomer has 30% penalty _bill = 30 + (_rate * 0.55) * 1.3; if (_rate > 100) //Costomer has 60% penalty _bill = 30 + (_rate * 0.55) * 1.6; if (_use < 0) //For som reason cutomer has { //got a negative use. This is an Error printf("There has been some problem\nProgram terminating!\n"); system("pause"); //Pause program and wait for key stroke return(1); //Return 1 for Error end terminate } //Print out costomers bill printf("Cutomer %li used %liL and their bill is $%f.\n", _account, _use, _bill); system("pause"); //Pause program and wait for key stroke return(0); //Return 0 for successful completion } //End program /* OUTPUT Enter the Costomers Account number for for water bill:> 12345 Enter the previous water meter reading:> 20000 Enter the new meter reading:> 20001 _rate = 0 _use modulus 1000 = 1 _rate = 1 Cutomer 12345 used 1L and their bill is $30.715000. Press any key to continue . . . */
