hi;

i did a function that get inputs of equation from user but i want to get from file

Code:

void getInput( int numUnKnowns, double** mat ){
int i, j;
printf
(
"\nEnter values for the specified row and column below ...\n"
"(The last column is the value for the RHS of the equation.)\n"
);
for( i = 0 ; i < numUnKnowns ; i++ )
{
mat[i] = (double*) malloc( (numUnKnowns+1)*sizeof(double) );
puts("");
for( j = 0 ; j < numUnKnowns+1 ; j++ )
{
printf("matrix[%d][%d] : ", i, j);
if( scanf("%lf", &mat[i][j]) != 1 )
{
--j;
puts("Bad entry ... try again with a 'real' number.");
}
while( getchar() != '\n' ) ; /* flush stdin ... */
}
}
printf("\nThe matrix entered:\n\n");
for( i = 0 ; i < numUnKnowns ; i++ )
{
for( j = 0 ; j < numUnKnowns+1 ; j++ ) printf("%+9f ", mat[i][j]);
puts("");
}
printf("\nPress 'Enter' to start iteration ... ");
getchar();
}

let file :

7a - 2b + c + 2d = 3

2a + 8b + 3c + d = -2

-a + 5c + 2d = 5

2b - c + 4d = 4

can any one help me how function read from file.

thanks