Merge pull request #25 from medvecky/handle_division_by_zero

Handle division by zero

CHANGELOG.md

@@ -16,4 +16,11 @@
 ## Changed
 
 - Optimized command handling functions
-- Updated README.md
+- Updated README.md
+
+# [v2.1.0]  2024-04-15
+
+## Added
+
+- functions for the operations with the stack
+- error handling

README.md

@@ -26,6 +26,9 @@ The calculator supports the following operations:
 | fsqr      | square root                                                   |
 | ftan      | tangent in radians                                            |
 | fsgn      | gives autonomous of the algebraic sign the number (-1; 0; 1)  |
+| ss        | print the content of the stack                                |
+| sc        | clear the stack                                               |
+| spop      | pop the first value of the stack                              |
 
 Additionally, it accommodates floating-point numbers up to nine digits in both decimal (e.g., 3.14) and scientific (e.g., 8.9e-5) notations.
 

src/modules/math_helper.c

@@ -99,6 +99,12 @@ void FP_mult( void )
 
 void FP_div( void )
 {
+    if ( arg1Fp[ 0 ] == 0 && arg1Fp[ 1 ] == 0 && arg1Fp[ 2 ] == 0 && arg1Fp[ 3 ] == 0 && arg1Fp[ 4 ] == 0 )
+    {
+        puts( "[FP]: Division by zero" );
+        return;
+    }
+
     FP_arg1ToFac();
     __asm__ ( "lda  #<%v", arg2Fp );
     __asm__ ( "ldy  #>%v", arg2Fp );