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structure issues in C

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Hi, I have the following structure declared. And I am trying to create an Identity matrix function. However I am getting a lot of errors. What could I be doing wrong ? Here is the code.
[Source]
typedef struct 
{
	fixed matrix44[4][4]
} matrix;

matrix IdentityMatrix()
{
	matrix a;
	a.matrix44[0][1] = a.matrix44[0][2] = a.matrix44[0][3] = FIX(0.0);
	a.matrix44[1][0] = a.matrix44[1][2] = a.matrix44[1][3] = FIX(0.0);
	a.matrix44[2][0] = a.matrix44[2][1] = a.matrix44[2][3] = FIX(0.0);
	a.matrix44[3][0] = a.matrix44[3][1] = a.matrix44[3][2] = FIX(0.0);
	a.matrix44[0][0] = a.matrix44[1][1] = a.matrix44[2][2] = a.matrix44[3][3] = FIX(1.0);
	
	return a;
}
[/Source]
[/source] I get errors as error : parse error before IdentityMatrix error : matrix undeclared first use it in this function. error : parse error before a error : a undeclared I am using pure c. I am not sure what the problem is. Anyone have any ideas ? Thanks.

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typedef struct _matrix_
{
fixed matrix44[4][4];
} matrix;

matrix IdentityMatrix(void)
{
matrix a;
a.matrix44[0][1] = a.matrix44[0][2] = a.matrix44[0][3] = FIX(0.0);
a.matrix44[1][0] = a.matrix44[1][2] = a.matrix44[1][3] = FIX(0.0);
a.matrix44[2][0] = a.matrix44[2][1] = a.matrix44[2][3] = FIX(0.0);
a.matrix44[3][0] = a.matrix44[3][1] = a.matrix44[3][2] = FIX(0.0);
a.matrix44[0][0] = a.matrix44[1][1] = a.matrix44[2][2] = a.matrix44[3][3] = FIX(1.0);

return a;
}

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