#include <stdio.h>
#include <stdlib.h>

extern int assembleraddsub(int,int,int,int*);

unsigned short addsub(int op1, int op2, int what, int *result);

int main(int argc, char** argv)
{
	if(argc != 4)
	{
    	    printf("\n Usage: ./a5 OP1 WHAT OP2\n");
    	    exit(1);
    	}

    	int op1 = atoi(argv[1]);
    	int op2 = atoi(argv[3]);
    	int what= 0;
    	int result;
    	unsigned short flags;

    	if(strcmp(argv[2],"+")==0)
    	{
    		what = 1;
    	} else if(strcmp(argv[2],"-")==0)
    	{
    		what = 0;
    	} else
    	{
    		printf("\n Falsche Operation! (Nur + oder -)\n");
    	}

    	flags = addsub(op1,op2,what,&result);

    	printf("\nO D I T S Z   A   P   C\n");
    	int i = 11;
    	int stelle;
    	for(; i>=0; i--)
    	{
    		stelle = flags >> i;
    		if(stelle & 1)
    		{
    			printf("1 ");
    		} else
    		{
    			printf("0 ");
    		}
    	}
    	printf("\n\nErgebnis und Operanden Signed:\n");
    	printf("%d %s %d = %d "	,(signed short)op1
    				,argv[2]
    				,(signed short)op2
    				,(signed short)result);

    	if(flags >> 11 == 1)
    	{
    		printf("(Ergebnis ist falsch!)\n");
    	} else
    	{
    		printf("(Ergebnis ist richtig!)\n");
    	}

    	printf("\n\nErgebnis und Operanden Unsigned:\n");
    	printf("%d %s %d = %d "	,(unsigned short)op1
    				,argv[2]
    				,(unsigned short)op2
    				,(unsigned short)result);

    	if(flags & 0x01)
    	{
    		printf("(Ergebnis ist falsch!)\n");
    	} else
    	{
    		printf("(Ergebnis ist richtig!)\n");
    	}

	return 0;
}

unsigned short addsub(int op1, int op2, int what, int *result)
{
	return assembleraddsub(op1,op2,what,result);
}