Question

C Language <stdio.h> (FUNCTIONS)

A concrete company wants to estimate what it will cost a customer to have a driveway poured. They can pour

a 3 inch deep 200 sq. ft. driveway in 3 hours, and they charge $50.00 per hour as their labor rate.

Write a program to ask the user for the length of the driveway (in feet), and the width of the driveway (in feet)

to be poured. For both the length and width, make sure the number entered is a non-zero positive number,

and continue to ask the user for the value until a valid number is entered. Then, using 5 different functions,

calculate:

• The square footage of the driveway

• The number of hours required to pour the driveway

• The cost for the concrete to pour the driveway

• The labor charges to pour the driveway

• The total cost to pour the driveway

Create global constants for:

• The number of square feet that can be poured in 3 hours (200)

• The number of hours required to pour 200 sq. ft. (3)

• The labor rate ($50.00/hr.)

• The price for 1 cubic foot of concrete ($90.00)

• Any other numbers used in your program

And, in the function to calculate the cost of the concrete, create a local constant for:

• The number of 3 inch deep square feet in 1 cubic yard of concrete (108)

The program will display:

• The square footage of the driveway

• The number of hours to pour the driveway

• The price for the concrete

• The labor charges

• The total cost to pour the driveway

Hints:

• DO NOT pre-calculate the number of square feet that can be poured in 1 hour – use the 2 constants (of

200 and 3) and let the program calculate the number (in case a new crew is hired that can pour more

than 200 square feet in 3 hours)

• Validation error messages are indented 3 spaces

• Have a blank line between the inputs and the output

• Functions, just as the main() program, should have comments

• Value-returning functions should not get input or display output

• Watch out for integer division

• Don’t forget the function prototypes (if necessary)

• Don’t forget the blank line before ‘Press any key to continue…”

Example Run #1:

(bold type is what is entered by the user)

Enter the length of the driveway (in feet): 80

Enter the width of the driveway (in feet): 8

The square footage of the driveway is: 640.00 sq. ft.

The number of hours required to pour 640.00 square feet is: 9.60 hours

The price for the concrete is: $533.33

The labor charges are: $480.00

The total cost to pour the driveway is: $1013.33

Example Run #2:

Enter the length of the driveway (in feet): -144

A positive value for the length must be entered.

Please re-enter the length of the driveway (in feet): 110

Enter the width of the driveway (in feet): 10

The square footage of the driveway is: 1100.00 sq. ft.

The number of hours required to pour 1100.00 square feet is: 16.50 hours

The price for the concrete is: $916.67

The labor charges are: $825.00

The total cost to pour the driveway is: $1741.67

The example runs show EXACTLY how your program input and output will look.

(validation messages are indented 3 spaces)

Answer 1

ANSWER:

#include<stdio.h>

//Global constants
const float sq_feet=200;
const float hrs=3;
const float rate=50.00;
const float price=90.00;

//Fucntion to calaculate total square feet by multiplying length and width
float calculateSquareFt(float a,float b)
{
   return a*b;
}

//Function to calculate hours taken
float calculateHrs(float Squarefeet)
{
   return (Squarefeet/sq_feet)*hrs;
}

//Function to calculate cost
float calculateCost(float sqft)
{
   const float cubicYard=108;
    return (sqft/cubicYard)*price;
}

//Function to calculate labour cost
float calculateLabour(float hours)
{
   return hours*rate;
}

//Function to calculate total cost
float calculateTotal(float cost,float lcost)
{
   return cost+lcost;
}

void main()
{
   float length,width;   //variables store length and width
   float totalSqft,hrs; //variables to store sq feet of driveway and hours taken to pour concrete
   float cost,labourCost,totalCost; //variables to store cost ,labour cost and total cost
   printf("Enter length of the driveway (in feet): ");
   scanf("%f",&length);
  
   while(length<=0) //Input validation
   {
       printf("   A positive value for the length must be entered. \n");
       printf("   Please re-enter the length of the driveway (in feet): ");
        scanf("%f",&length);  
   }
  
   printf("Enter width of the driveway (in feet): ");
   scanf("%f",&width);
   while(length<=0)   //Input validation
   {
       printf("   A positive value for the width must entered. \n");
       printf("   Please re-enter the width of the driveway (in feet): ");
        scanf("%f",&width);  
   }
  
   totalSqft=calculateSquareFt(length,width);
   hrs=calculateHrs(totalSqft);
   cost=calculateCost(totalSqft);
   labourCost=calculateLabour(hrs);
   totalCost=calculateTotal(cost,labourCost);
  
   printf("\n\nThe square footage of the diveway is: %.2f sq. ft.\n",totalSqft);
   printf("The number of hours required to pour %.2f square feet is: %.2f hours\n",totalSqft,hrs);
   printf("The price for the concrete is: $%.2f\n",cost);
   printf("The labor charges are: $%.2f\n",labourCost);
   printf("The total cost to pour the driveway is: $%.2f\n",totalCost);
      
}

Sample Output: