First C program ? ? error: syntax error before "int"

[Jasonx521]

Here is the error message:

assignment1.c: In function `gateInput':
assignment1.c:24: error: syntax error before "int"

and here is the code:

#include "stdlib.h"
#include "assert.h"
#include "stdio.h"
#include "circuit.h"

int main(int argc, char * argv[])
{
int i;
struct gate * g;
printf("type an integer:\n");
scanf("%d", &i);
g = gateInput(&i);
gatePrint(g);

return 0;

}

struct gate * gateInput(int * value)
{
struct gate * d = gateConstant(int * value);
return d;
}

struct gate * gateConstant (int value)
{
struct gate * r = (struct gate *) malloc(sizeof(struct gate));
assert(r != 0);

if (value == 0)
return gateZero();
if (value == 1)
return gateOne();
}

struct gate * gateZero()
{
struct gate * r = (struct gate *) malloc(sizeof(struct gate));
assert(r != 0);
r -> gateType = ConstantZeroGate;
printf("EnteredValue: ", &r);
return r;
}

struct gate * gateOne()
{
struct gate * r = (struct gate *) malloc(sizeof(struct gate));
assert(r != 0);
r -> gateType = ConstantOneGate;
printf("EnteredValue: ", &r);
return r;
}

void gatePrint (struct gate * e)
{
struct gate * print = e;
printf("The entered Value: ", &print);
}

[Prelude]

>struct gate * d = gateConstant(int * value);
You're calling a function, not declaring one:

struct gate * d = gateConstant(value);

And please use code tags, preferrably with well formatted code.

[Jasonx521]

thank you.. obviously

[swoopy]

>struct gate * d = gateConstant(int * value);
I think you want:

struct gate * d = gateConstant(*value);

You want to pass gateConstant an int, not a pointer to int.

[Prelude]

>struct gate * d = gateConstant(*value);
Ah, yes. Benefits of looking at the "formatted" code rather than the code with lots of random newlines all over the place before the OP edited it.

[Desolation]

Oh, and you might want to declare 'gate' like this so that you can stop writing 'struct' everywhere:

typedef struct
{
} gate;

gate* gate_ptr;

[swoopy]

>struct gate * d = gateConstant(*value);
Ah, yes. Benefits of looking at the "formatted" code rather than the code with lots of random newlines all over the place before the OP edited it.

I guess I should be glad I didn't see it before editing.

[Jasonx521]

Okay I made some progress, but now is where I 'm really stuck... how would I set up gateAnd, GateOr etc..?

I know the logical math and how to add binary, but never tried to replicate it with a program?

I will need to replicate a circuit also using a half adder, and fulladder? I have looked over wikipedia, but still a little confusing. ?

[Jasonx521]

Here is the code:

#include "stdlib.h"
#include "assert.h"
#include "stdio.h"
#include "circuit.h"

int main(int argc, char * argv[])
{		
	struct gate * g = gateInput("Type an Integer");
	gatePrint(g);		
	return 0;
}

	struct gate * gateInput(char * prompt) 
	{		
		int i;
		printf(prompt);
		scanf("%d", &i);
		return gateConstant(i);
	}

	struct gate * gateConstant (int value)
	{
		struct gate * r = (struct gate *) malloc(sizeof(struct gate));
		assert(r != 0);

		if (value == 0)
		return gateZero();

		if (value == 1)
		return gateOne();
	}

	struct gate * gateZero()
	{
		struct gate * r = (struct gate *) malloc(sizeof(struct gate));
		assert(r != 0);
		r -> gateType = ConstantZeroGate;
		return r;
	}

	struct gate * gateOne()
	{
		struct gate * r = (struct gate *) malloc(sizeof(struct gate));
		assert(r != 0);
		r -> gateType = ConstantOneGate;
		return r;
	}

	void gatePrint (struct gate * e)
	{
		printf("The entered Value: %d \n",*e);
	}

	int gateEval (struct gate * e)
	{
		
	}

	void intToBit (int value, int * eights, int * fours, int * twos, int * ones)
	{
		assert ((value >= 0) && (value < 16));
		*ones = value % 2;		
	}

	struct gate * gateNot(struct gate * arg)
	{
	

	}
	
	struct gate * gateAnd(struct gate * left, struct gate * right)
	{

	}

	struct gate * gateOr(struct gate * left, struct gate * right)
	{

	}

	struct gate * gateXor(struct gate * left, struct gate right)
	{

	}

	void halfAdder(struct gate * left, struct gate * right, struct * carryin, struct gate **sum)
	{

	}

[SlyMaelstrom]

See my signature? Edit your post and wrap your code in that tag.

[Jasonx521]

See my signature? Edit your post and wrap your code in that tag.

Thank you..