Code:
void prob2(void)
{
FILE *matrix;
int k, z, c;
double **A,**B, *a, *b, a_norm;
matrix=fopen("matrix.dat", "r");
if(matrix == NULL){
printf("Error in file opening for *matrix.\n");
exit(1);
}
A= (double **)calloc((size_t)4, sizeof(double *));
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