updated work

1 files changed, 52 insertions, 0 deletions

diff --git a/comp/lucas-standen-NEA/code/proto/astg.c b/comp/lucas-standen-NEA/code/proto/astg.c
new file mode 100644
index 0000000..e96b771
--- /dev/null
+++ b/comp/lucas-standen-NEA/code/proto/astg.c
@@ -0,0 +1,52 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+typedef struct ast_node ast_node;
+
+typedef enum op {
+	ADD = 0,
+	SUB = 1,
+	MUL = 2,
+	DIV = 3,
+} op;
+
+typedef struct ast_node {
+	op operation;
+	int realLeft;
+	int realRight;
+	ast_node *right;
+	ast_node *left;
+} ast_node;
+
+void freeAst(ast_node *head){
+	if (head->left != NULL)
+		freeAst(head->left);
+	if (head->right != NULL)
+		freeAst(head->left);
+	free(head);
+}
+
+int exec(ast_node *exp){
+	if (exp->left != NULL){
+		exp->realLeft = exec(exp->left);
+		freeAst(exp->left);
+		exp->left = NULL;
+	}
+	if (exp->right != NULL){
+		exp->realRight = exec(exp->right);
+		freeAst(exp->right);
+		exp->right = NULL;
+	}
+
+	if (exp->operation == ADD)
+		return exp->realLeft+ exp->realRight;
+	if (exp->operation == SUB)
+		return exp->realLeft - exp->realRight;
+	if (exp->operation == MUL)
+		return exp->realLeft * exp->realRight;
+	if (exp->operation == DIV)
+		return exp->realLeft/ exp->realRight;
+	return 0;
+}
+