Programming Forums > Application Development > C

WalterSlopeboi · Jan 28th, 2008, 12:44 AM

Assignment:

The program asks for the user to input the radius and height of a right
cylinder. It then calculates surface area and volume of this cylinder
and prints the out-put on the screen in the FORMAT GIVEN BELOW. The
main program calls following three functions to accomplish the above job.
calc_area (double rad, double height)
calc_volume (double rad, double height)
and
print_info (void)

II. Helpful Math Hints:
Surface area = 2*PI*r*h + PI*r*r; and volume = PI * r*r*h

III. Helpful Programming Hints:

1. Preprocessor define PI= 3.14159
2. Declare PROTOTYPE FUNCTIONS shown above with proper return
parameters.
3. Define the three programs mentioned above, in region out-side your
main program.
3. Declare variables r, d, h, V, A as “double”.
4. Ask user to enter r in centimeters, read the value and assign to r;
ask to enter h in cms, read the value (scan in lf format) and assign
to h.
5. Call the three programs, assigning their return values
appropriately.
6. Using the results print the out-put.

IV: Output to the screen in the format:
__________________________________________________ ________________________

Enter diameter in centimeters: 3
Enter height in centimeters: 5

A right circular cylinder with a diameter = 3.00 cm and a height = 5.00
cm
will have a volume and surface area

VOLUME SURFACE AREA
------------------------------------------------------

35.3429 cu_cm 61.2610 sq_cm
Press any key to continue

Okay, I'm new to this, but I've been working on this all day and studying up on it and here's what I have so far:

(Toggle Plain Text)

#include <stdio.h>
#define PI 3.14159

//prototypes
double calc_area(double rad, double height);
double calc_volume(double rad, double height);

int main()
{

double rad, height, area, vol;

printf("Please enter radius (in cm): ");
scanf("%lf",&rad);
printf("\nPlease enter height (in cm): ");
scanf("%lf",&height);

area = calc_area(rad, height);
vol = calc_volume(rad, height);

printf("Surface Area: %.2lf cubic centimeters\nVolume: %.2lf square centimeters\n", area,vol);
return 0;

}

double calc_area (double rad, double height)
{
return 2*PI*rad*height + PI*rad*rad;
}

double calc_volume (double rad, double height)
{
return PI*rad*rad*height;
}

Is this correct?

titaniumdecoy · Jan 28th, 2008, 12:51 AM

For one thing, surface area should be in square centimeters while volume should be in cubic centimeters.

WalterSlopeboi · Jan 28th, 2008, 12:57 AM

Quote:

Originally Posted by titaniumdecoy

For one thing, surface area should be in square centimeters while volume should be in cubic centimeters.

Okay...I will change that. Any other problems?

Sane · Jan 28th, 2008, 1:02 AM

Beautiful.

But I see a couple things.

The example input shows that the diameter is entered. But the requirements say the radius should be entered. This is an inconsistency in the assignment. You should find out what is really required.

Depending on how picky your teacher is, he might not like how you used "rad", "height", "area", and "volume", when he told you to use "r", "h", "A", and "V".

Then the last thing you have left is to write the print_info() function which will properly format your answer. Although your numbers are correct, you are currently not outputting it with the exact format that the assignment demonstrates, nor are you creating a third function as specified in the requirements.

Good work.

Aside: I think the example output is incorrect. It says the surface area is 61.2610 for (r=1.5, h=5), when the Math says it should be 54.19.

Edit: Lastly, the example output displays the result with four decimal places. Currently %.2lf shows only two decimal places.

Jan 28th, 2008, 12:44 AM	#1
WalterSlopeboi Newbie Join Date: Jan 2008 Posts: 9 Rep Power: 0	Does this code look correct? Assignment: The program asks for the user to input the radius and height of a right cylinder. It then calculates surface area and volume of this cylinder and prints the out-put on the screen in the FORMAT GIVEN BELOW. The main program calls following three functions to accomplish the above job. calc_area (double rad, double height) calc_volume (double rad, double height) and print_info (void) II. Helpful Math Hints: Surface area = 2PIrh + PIrr; and volume = PI rrh III. Helpful Programming Hints: 1. Preprocessor define PI= 3.14159 2. Declare PROTOTYPE FUNCTIONS shown above with proper return parameters. 3. Define the three programs mentioned above, in region out-side your main program. 3. Declare variables r, d, h, V, A as “double”. 4. Ask user to enter r in centimeters, read the value and assign to r; ask to enter h in cms, read the value (scan in lf format) and assign to h. 5. Call the three programs, assigning their return values appropriately. 6. Using the results print the out-put. IV: Output to the screen in the format: __________________________________________________ ________________________ Enter diameter in centimeters: 3 Enter height in centimeters: 5 A right circular cylinder with a diameter = 3.00 cm and a height = 5.00 cm will have a volume and surface area VOLUME SURFACE AREA ------------------------------------------------------ 35.3429 cu_cm 61.2610 sq_cm Press any key to continue Okay, I'm new to this, but I've been working on this all day and studying up on it and here's what I have so far: (Toggle Plain Text) #include <stdio.h> #define PI 3.14159 //prototypes double calc_area(double rad, double height); double calc_volume(double rad, double height); int main() { double rad, height, area, vol; printf("Please enter radius (in cm): "); scanf("%lf",&rad); printf("\nPlease enter height (in cm): "); scanf("%lf",&height); area = calc_area(rad, height); vol = calc_volume(rad, height); printf("Surface Area: %.2lf cubic centimeters\nVolume: %.2lf square centimeters\n", area,vol); return 0; } double calc_area (double rad, double height) { return 2PIradheight + PIradrad; } double calc_volume (double rad, double height) { return PIradradheight; } #include <stdio.h> #define PI 3.14159 //prototypes double calc_area(double rad, double height); double calc_volume(double rad, double height); int main() { double rad, height, area, vol; printf("Please enter radius (in cm): "); scanf("%lf",&rad); printf("\nPlease enter height (in cm): "); scanf("%lf",&height); area = calc_area(rad, height); vol = calc_volume(rad, height); printf("Surface Area: %.2lf cubic centimeters\nVolume: %.2lf square centimeters\n", area,vol); return 0; } double calc_area (double rad, double height) { return 2PIradheight + PIradrad; } double calc_volume (double rad, double height) { return PIradradheight; } Is this correct?

Jan 28th, 2008, 12:51 AM	#2
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 908 Rep Power: 3	Re: Does this code look correct? For one thing, surface area should be in square centimeters while volume should be in cubic centimeters.

Jan 28th, 2008, 1:02 AM	#4
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,034 Rep Power: 6	Re: Does this code look correct? Beautiful. But I see a couple things. The example input shows that the diameter is entered. But the requirements say the radius should be entered. This is an inconsistency in the assignment. You should find out what is really required. Depending on how picky your teacher is, he might not like how you used "rad", "height", "area", and "volume", when he told you to use "r", "h", "A", and "V". Then the last thing you have left is to write the `print_info()` function which will properly format your answer. Although your numbers are correct, you are currently not outputting it with the exact format that the assignment demonstrates, nor are you creating a third function as specified in the requirements. Good work. Aside: I think the example output is incorrect. It says the surface area is `61.2610` for (`r=1.5, h=5`), when the Math says it should be `54.19`. Edit: Lastly, the example output displays the result with four decimal places. Currently `%.2lf` shows only two decimal places.

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Programming Forums > Application Development > C

Does this code look correct?