Thread: Annoying error

Hi -

I've created two matrices i.e

Code:

float matrixA[3][3];
float matrixB[3][3];

I've then done some calculations to set the values in these matrices. This goes by without any errors.

I then try and do some further calculations and set the results to a float, and then when I try to build this I get the error:

warning C4700: local variable 'matrixA' used without having been initialized
warning C4700: local variable 'matrixB' used without having been initialized

any ideas why this is happeneing?

any help is much appreciated

H
x

you will get that warning if you try to use the array before assigning any values to it. For example, VC++ 6.0 compiler produces that error

Code:

int main()
{
float matrixA[3][3];
float matrixB[3][3];

printf("%f\n", matrixA[0][0]); <<< warning here

return 0;
}

changing it like this will remove the warning because the array is initialized to all 0s.

Code:

	float matrixA[3][3] = {0};

The thing is I have assigned values to it.

Here's the actual code that I have created:

Code:

float betaDet[3][3];
	float A[3][3];

	betaDet[0][0]=triangle->p0.x-ray->origin.x;
	betaDet[1][0]=triangle->p0.y-ray->origin.y;
	betaDet[2][0]=triangle->p0.z-ray->origin.z;

	betaDet[0][1]=triangle->p0.x-triangle->p2.x;
	betaDet[1][1]=triangle->p0.y-triangle->p2.y;
	betaDet[2][1]=triangle->p0.z-triangle->p2.z;

	betaDet[0][2]=ray->direction.x;
	betaDet[1][2]=ray->direction.y;
	betaDet[2][2]=ray->direction.z;

	A[0][0]=triangle->p0.x-triangle->p1.x;
	A[1][0]=triangle->p0.y-triangle->p1.y;
	A[2][0]=triangle->p0.z-triangle->p1.z;

	A[0][1]=triangle->p0.x-triangle->p2.x;
	A[1][1]=triangle->p0.y-triangle->p2.y;
	A[2][1]=triangle->p0.z-triangle->p2.z;

	A[0][2]=ray->direction.x;
	A[1][2]=ray->direction.y;
	A[2][2]=ray->direction.z;


	point->beta=(betaDet[0][0]*(betaDet[1][1]*betaDet[2][2]-betaDet[2][1]*betaDet[1][2])
				+betaDet[0][1]*(betaDet[1][2]*betaDet[3][0]-betaDet[2][2]*betaDet[1][0])
				+betaDet[0][2]*(betaDet[2][0]*betaDet[2][1]-betaDet[2][0]*betaDet[1][1]))/
				(A[0][0]*(A[1][1]*A[2][2]-A[2][1]*A[1][2])
				+A[0][1]*(A[1][2]*A[3][0]-A[2][2]*A[1][0])
				+A[0][2]*(A[2][0]*A[2][1]-A[2][0]*A[1][1]));

Thanks for help so far,

H

x

The code you posted doesn't match the warning message.
Show the location of the warning.
Kurt

Sorry - i changed the warning messages to fit my example previously. so the warning messages now are:

warning C4700: local variable 'betaDet' used without having been initialized
warning C4700: local variable 'A' used without having been initialized

cheers,

H

I had initialized the values - I've just looked and the problem I had was I'd referenced matrix[3][0] which doesnt exist.

thanks anyways

H