My first and simple program

Hi there

I'm still new to this Programming thing so bear with me:

I'm trying to set a program that reads like this:

-How many cakes did you eat today?
__


-You gained __ lbs.


here are my variables:


5000 Calories = 1 cake
1 lbs = 3500 Calories


heres my setup:


#include<stdio.h>
#define CALORIES_IN_CAKE 5000
#define CALORIES_IN_POUND 3500

int main (void) {

double pounds_in_cake, num_cakes;

pounds_in_cake=(CALORIES_IN_CAKE)/CALORIES_IN_POUND;

printf("How many cakes did you eat today?\n");
scanf("%lf", &num_cakes);
printf("You gained %.2lf pounds.\n",

pounds_in_cake*num_cakes);

system("PAUSE");
return 0;

}


However, my output is wrong.

I cant seem to find the problem

Any response will greatly appreciated

The problem is this line:

Code:

---

pounds_in_cake=(CALORIES_IN_CAKE)/CALORIES_IN_POUND;

---

This does integer arithmetic, so pounds_in_cake will always equal 1. To fix this, cast one of the values to a double to ensure that floating point arithmetic is done:

Code:

---

pounds_in_cake=(double)CALORIES_IN_CAKE/CALORIES_IN_POUND;

---

Thanks birthtub!

Here's another program I want to setup:

-How many people did you kill today?
__


You will serve __ of years in jail


so my variables are:

For every one person you kill, you will serve 7 years




#include <stdio.h>
#define YEARS_EACH_PEOPLE=7
#define PEOPLE_KILLED=1

int main (void) {

int years_served_per_killing, num_killings;

years_served_per_killing=YEARS_EACH_PEOPLE*PEOPLE_ KILLED;

printf("How many people did you kill today?\n");
scanf("%d", num_killings);
printf("You will serve %d of years in jail.\n", years_served_per_killing*num_killings);

system("PAUSE");
return 0;

}


I get an error in :

ears_served_per_killing=YEARS_EACH_PEOPLE*PEOPLE_K ILLED

dont really understand what the problem is though

Quote:

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Originally Posted by Neotriz

Thanks birthtub!

---

bithub has a new nickname!!!!

Youve got '=' char in your marco. take out that and also you've got a space in between People_ Killed.

Code:

---

#define YEARS_EACH_PEOPLE=7
#define PEOPLE_KILLED=1

---

Code:

---

years_served_per_killing=YEARS_EACH_PEOPLE*PEOPLE_ KILLED;

---

To be honest, you dont need to find the year)_served_per_killing. You could just getting the no of people killed * YEARS_EACH_PEOPLE

Thats should do it.

~ssharish

Quote:

---

Originally Posted by Kennedy

bithub has a new nickname!!!!

---

Thats wicked man!!!! lol

~ssharish

ssharish, I still get the error.

what do you mean by " '=' char in my marco"?

Quote:

---

Originally Posted by ssharish2005

Thats wicked man!!!! lol

~ssharish

---

Yes, that's a winner.

Quote:

---

Originally Posted by Kennedy

bithub has a new nickname!!!!

---

At least he didn't call me bathtub. Although now that I think about it, birthtub may be worse...

Quote:

---

what do you mean by " '=' char in my marco"?

---

You need to get rid of the equals sign.

Quote:

---

Originally Posted by bithub

At least he didn't call me bathtub. Although now that I think about it, birthtub may be worse...

You need to get rid of the equals sign.

---

sorry for the nickname. It is rather humorous haha

But anyway, i cant seem to get it work at all

Can you post the whole script and see if it works?

scanf() should take a pointer to an integer.

Code:

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scanf("%d", &num_killings);

---

Still not working

:(

What does the compiler or output look like?

You should learn to use code tags when you post your programs.