Hi,
what does this error mean and how to fix it?
'=' : left operand must be l-value
ThanksCode:#include <stdio.h> #define TAX 0.10 void main() { float bal, t; bal = (float)72.10; TAX = 0.20; t = bal * (float)TAX; printf("The tax on %.2f is %.2f\n", bal, t); }
You can't change a #define like that. If you want to change the value throughout your program just make it a variable ( local or global ) and then change it. When you have a #define the whole idea is that it is constant for the life of the program. You cannot modify that value.
"...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers
Thanks for explanation. Yes, it is a constant and illegal to change it.
Ahh, and about your code, don't use void main(), the main() function only returns integer.
Another way to declare constants is:
Code:const int blah; const type name;
>Another way to declare constants is:
Not in C. Using the const keyword on a variable merely makes it read-only where if you innocently try to modify the value, you get an error. A true constant can be used as the size for an array:
-PreludeCode:#include <stddef.h> #define CONSTANT 10 const size_t READONLY = 10; int main ( void ) { int array1[CONSTANT]; /* Legal */ int array2[READONLY]; /* Bzzt! Error */ return 0; }
My best code is written with the delete key.
