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where is the error to make this program work ?

This is a discussion on where is the error to make this program work ? within the C Programming forums, part of the General Programming Boards category; Hope you can help find the error. it wont calculate d and x properly Matthacker Code: #include <stdio.h> #include <math.h> ...

  1. #1
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    where is the error to make this program work ?

    Hope you can help find the error. it wont calculate d and x properly

    Matthacker
    Code:
    #include <stdio.h>
    #include <math.h>
    
    
    
    
    int main ( void )
    {
    	float a;
    	float b;
    	float c;
    	float d;
    	float x;
    	
    
    
    	a = 0, b= 0, c = 0, d = 0, x = 0;
    	x = (-b +- sqrt(d)) / (2*a);
    	d = (pow( b, 2)) - (4*a*c);
    
    
    	printf ( "please input the three numbers in the 2nd degree polynomium:");
    	scanf ("%f%f%f", &a,&b,&c);
    	printf ( " the polynomium is:" );
    	{
    	if ( a < 0 )
    		printf("%fx^2",a);
    	else
    		printf("%fx^2",a);
    	if ( b < 0 )
    		printf("%fx",b);
    	else
    		printf("+%fx",b);
    	if ( c < 0 )
    		printf("%f",c);
    	else
    		printf("+%f",c);
    
    
    	printf ( " = 0 \n");
    	}
    	
    	printf (" diskriminanten er: %f\n", d);
    	printf(" x er:%f",x);
    
    
    	return 0;
    }

  2. #2
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    Quote Originally Posted by matthacker View Post
    Hope you can help find the error. it wont calculate d and x properly
    That's because you are trying to calculate your results before you know what values they operate upon.

    Move lines 18 and 19 to line 42.

  3. #3
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    thanks

  4. #4
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    No worries... Just remember the cardinal rule when programming...

    Compilers are STUPID... you gotta tell them *everything* and in the right order, if you want to get the correct result.
    MK27 and dennis.cpp like this.

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