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

This is a discussion on First C program ? ? error: syntax error before "int" within the C Programming forums, part of the General Programming Boards category; Here is the error message: assignment1.c: In function `gateInput': assignment1.c:24: error: syntax error before "int" and here is the code: ...

  1. #1
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    First C program ? ? error: syntax error before "int"

    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);
    }
    Last edited by Jasonx521; 10-02-2006 at 05:35 PM.

  2. #2
    Code Goddess Prelude's Avatar
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    >struct gate * d = gateConstant(int * value);
    You're calling a function, not declaring one:
    Code:
    struct gate * d = gateConstant(value);
    And please use code tags, preferrably with well formatted code.
    My best code is written with the delete key.

  3. #3
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    thank you.. obviously

  4. #4
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    >struct gate * d = gateConstant(int * value);
    I think you want:
    Code:
    struct gate * d = gateConstant(*value);
    You want to pass gateConstant an int, not a pointer to int.

  5. #5
    Code Goddess Prelude's Avatar
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    >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.
    My best code is written with the delete key.

  6. #6
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    Oh, and you might want to declare 'gate' like this so that you can stop writing 'struct' everywhere:
    Code:
    typedef struct
    {
    } gate;
    
    gate* gate_ptr;

  7. #7
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    Quote Originally Posted by 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.
    I guess I should be glad I didn't see it before editing.

  8. #8
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    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. ?
    Last edited by Jasonx521; 10-02-2006 at 09:59 PM.

  9. #9
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    Here is the code:

    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)
    	{
    
    	}
    Last edited by Dave_Sinkula; 10-02-2006 at 09:42 PM. Reason: Added [code][/code] tags -- learn to use them yourself. [Sorry, Sly.]

  10. #10
    Devil's Advocate SlyMaelstrom's Avatar
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    See my signature? Edit your post and wrap your code in that tag.
    Sent from my iPadŽ

  11. #11
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    Quote Originally Posted by SlyMaelstrom
    See my signature? Edit your post and wrap your code in that tag.
    Thank you..

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