Trying to do Simple Multiplication

[kfindley]

I've been looking online but am having trouble finding sources on using C for basic multiplication. I'm assuming this is not the original purpose of C, but its what I need to do.

If anyone can see glaring errors i'm making please let me know!

I've tried declaring my variables as both doubles and int 's but to no avail.

#include <stdio.h>
 #include <math.h>
 int main()
 {
     /* the given dimensions of the tank in meters*/
     #define DIAMETER 5.0;
     #define HEIGHT 10.0;
     /* conversion factors*/
     #define M2F 3.2808
     #define F2G 7.481
     
     /* Declare my variables*/
     int DIAMETER_FEET,HEIGHT_FEET,VOLUME_FEET,VOLUME;
     
     /* define my variables*/
     &DIAMETER_FEET = DIAMETER * M2F;
     &HEIGHT_FEET = HEIGHT * M2F;
     &VOLUME_FEET = DIAMETER_FEET * HEIGHT_FEET;
     &VOLUME = VOLUME_FEET * F2G;
     
     /* output statement*/
     printf(VOLUME);
     
     return 0;
}

I updated my code but its still not working. The specific error i am getting is:
: In function 'main':
:36: error: expected ')' before ';' token
:37: error: expected ')' before ';' token
:39: error: expected ')' before ';' token

#include <stdio.h>
 #include <math.h>
 int main()
 {
     /* Declare my variables*/
     double DIAMETER_FEET,HEIGHT_FEET,VOLUME_FEET,VOLUME;
     
     /* the given dimensions of the tank in meters*/
     #define DIAMETER 5.0;
     #define HEIGHT 10.0;
     /* conversion factors*/
     #define M2F 3.2808;
     #define F2G 7.481;
     
     /* define my variables*/
     DIAMETER_FEET = (DIAMETER * M2F);
     HEIGHT_FEET = (HEIGHT * M2F);
     VOLUME_FEET = (DIAMETER_FEET * HEIGHT_FEET);
     VOLUME = (VOLUME_FEET * F2G);
     
     /* output statement*/
     printf("%f", VOLUME);
     
     return 0;
}

[and1hotsauce]

hi. When your defining your values, do it before int main()

also the correct syntax is define M2F 3.208

there is no semi-colon

#include <stdio.h>
#include <math.h>

/* the given dimensions of the tank in meters*/
#define DIAMETER 5.0
#define HEIGHT 10.0
/* conversion factors*/
#define M2F 3.2808
#define F2G 7.481
int main()
{
/* Declare my variables*/
double DIAMETER_FEET,H EIGHT_FEET,VOLU ME_FEET,VOLUME;


/* define my variables*/
DIAMETER_FEET = (DIAMETER * M2F);
HEIGHT_FEET = (HEIGHT * M2F);
VOLUME_FEET = (DIAMETER_FEET * HEIGHT_FEET);
VOLUME = (VOLUME_FEET * F2G);

/* output statement*/
printf("%f", VOLUME);

getch();
}

[whodgson]

They are not values, they are variables and if they are declared outside of the main() function they will have global scope which is not recommended The experts invariably coach that a variable should only be given enough scope to serve its purpose......an d no more.

[Dheeraj Joshi]

Don't end #define with a semicolon....

Regards
Dheeraj Joshi

[mush1578]

int a,b,c;
cout<<"enter the value of a"<<endl;
cin>>a;

cout<<"enter the value of b"<<endl;
cin>>b;
c=a*b;
cout<<"the multiplication is =="<<c<<endl;

[kfindley]

thank you whodgson, I ultimately did just eliminate the defines.

[kfindley]

int a,b,c;
cout<<"enter the value of a"<<endl;
cin>>a;

cout<<"enter the value of b"<<endl;
cin>>b;
c=a*b;
cout<<"the multiplication is =="<<c<<endl;

I'm not sure what this is at all but thank you for the reply.
I think i must just be unfamiliar with the syntax you are using.

[Banfa]

kfindley, it is not clear if your problem has been solved.

If not I suggest you post your current code (using [code] ... [/code] tags round it) and your current set of errors/problems.

[kfindley]

My issues were resolved by and1hotsauce . Thank you