add: added projectsHEADmain

1 files changed, 29 insertions, 0 deletions

diff --git a/myfind/ast_evaluation/ast_evaluation.c b/myfind/ast_evaluation/ast_evaluation.c
new file mode 100644
index 0000000..7ad91af
--- /dev/null
+++ b/myfind/ast_evaluation/ast_evaluation.c
@@ -0,0 +1,29 @@
+#include <err.h>

+#include <stdio.h>

+

+#include "expression.h"

+

+int eval_expr(struct my_expr *expr)

+{

+    if (expr->type == EXPR_NUMBER)

+        return expr->data.value;

+    else if (expr->type == EXPR_NEGATION)

+        return -1 * eval_expr(expr->data.children.left);

+    else

+    {

+        int right = eval_expr(expr->data.children.right);

+        switch (expr->type)

+        {

+        case EXPR_ADDITION:

+            return eval_expr(expr->data.children.left) + right;

+        case EXPR_SUBTRACTION:

+            return eval_expr(expr->data.children.left) - right;

+        case EXPR_MULTIPLICATION:

+            return eval_expr(expr->data.children.left) * right;

+        default:

+            if (expr->data.children.right == NULL || (right == 0))

+                err(1, "Division by zero not allowed!");

+            return eval_expr(expr->data.children.left) / right;

+        }

+    }

+}