C Program Compilation in Linux

[sanjibdsharma]

I have prepared a C Program in LINUX which has the following command line:

AP[i][j]*temp.T[i][j] = AE[i+1][j]*temp.T[i+1][j]+AW[i-1][j]*temp.T[i-1][j]+ AN[i][j+1]*temp.T[i][j+1]+ AS[i][j-1]*temp.T[i][j-1];

the error message on compilation is: invalid lvalue assignment.
Why is this error coming? I am not able to understand how to get over this error. Please suggest.

Thanks

Sanjib

[DavT]

well, AP[i][j]*temp.T[i][j] gives a result. You can't assign anything to a result. The C programming language will not solve equations for you, you have to do that yourself! To take a simpler example:

/* say I want to solve the equation a * b = c + d ... */
double a,b,c,d;
/* I know b, c and d. I want to solve for a */
b = 5.0; c = 20.0; d = 15.0;

a = (c + d) / b;

/* print out the answer */
printf("answer: a = %g\n", a);