8 files changed, 123 insertions, 0 deletions
diff --git a/comp/work/42/rpn/Makefile b/comp/work/42/rpn/Makefile
new file mode 100644
index 0000000..6718c5b
--- /dev/null
+++ b/comp/work/42/rpn/Makefile
@@ -0,0 +1,21 @@
+CC=cc
+CFLAGS=-ggdb -Wextra -Wall -Werror
+LIBS=-lm
+
+SRC = rpn.c stack.c
+OBJ = ${SRC:.c=.o}
+
+all: rpn 
+
+.c.o:
+	${CC} -c ${CFLAGS} $<
+rpn: ${OBJ}
+	${CC} -o $@ ${OBJ} ${LIBS}
+install: all 
+	cp rpn /usr/local/bin/rpn
+clean:
+	rm -rf rpn *.o
+uninstall: 
+	rm /usr/local/bin/rpn
+
+.PHONY: all clean install uninstall
diff --git a/comp/work/42/rpn/rpn b/comp/work/42/rpn/rpn
new file mode 100755
index 0000000..424fbc5
--- /dev/null
+++ b/comp/work/42/rpn/rpn
diff --git a/comp/work/42/rpn/rpn.c b/comp/work/42/rpn/rpn.c
new file mode 100644
index 0000000..f5cd6b7
--- /dev/null
+++ b/comp/work/42/rpn/rpn.c
@@ -0,0 +1,56 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "stack.h"
+
+char *readword(FILE *f) {
+        if (getc(f) == EOF) return NULL;
+        fseek(f, -1, SEEK_CUR);
+
+	char *word = malloc(10);
+	char c;
+	int i = 0;
+	while ((c = getc(f)) != ' ') {
+        	if (c == EOF || c == '\n') break;
+		word[i] = c;
+		i++;
+	}
+	word[i] = 0;
+	return word;
+}
+
+int main() {
+        FILE *f = fopen("test.rpn", "r");
+        stack *s = initstack(0 ,100);
+
+	char *word;
+	int a, b;
+	while ((word = readword(f)) != NULL) {
+        	if (!isdigit(word[0])) {
+			b = pop(s);
+			a = pop(s);
+        		switch (word[0]) {
+				case '+': push(s, a+b); break;
+				case '-': push(s, a-b); break;
+				case '*': push(s, a*b); break;
+				case '/': push(s, a/b); break;
+				case '^': push(s, pow(a, b)); break;
+				case '~': 
+					push(s, a);
+					push(s, -b);
+					break;
+				default:
+        				printf("unknown symbol %c\n",word[0]);
+        				exit(1);
+        				break;
+        		}
+        	}
+        	else push(s, atoi(word));
+        	free(word);
+	}
+	printf("%d\n", pop(s));
+	
+	deinitstack(s); 
+}
diff --git a/comp/work/42/rpn/rpn.o b/comp/work/42/rpn/rpn.o
new file mode 100644
index 0000000..169c928
--- /dev/null
+++ b/comp/work/42/rpn/rpn.o
diff --git a/comp/work/42/rpn/stack.c b/comp/work/42/rpn/stack.c
new file mode 100644
index 0000000..0311404
--- /dev/null
+++ b/comp/work/42/rpn/stack.c
@@ -0,0 +1,35 @@
+#include <stddef.h>
+#include <stdlib.h>
+
+typedef struct stack {
+	int *sp;
+	int value;
+	int *stack;
+} stack;
+
+int pop(stack *stack){
+	stack->sp -= sizeof(int);
+	int i = *stack->sp;
+	*stack->sp = stack->value;
+	return i;
+}
+
+void push(stack *stack, int value){
+	*stack->sp = value;
+	stack->sp += sizeof(int);
+}
+
+void deinitstack(stack *stack){
+	free(stack->stack);
+	free(stack);
+	stack = NULL;
+}
+
+stack *initstack(int value, size_t size){
+	stack *s = malloc(sizeof(stack));
+	s->stack = calloc(0, size*sizeof(int));
+	s->sp = s->stack;
+	s->value = value;
+	return s;
+}
+
diff --git a/comp/work/42/rpn/stack.h b/comp/work/42/rpn/stack.h
new file mode 100644
index 0000000..0c78a10
--- /dev/null
+++ b/comp/work/42/rpn/stack.h
@@ -0,0 +1,10 @@
+typedef struct stack {
+	int *sp;
+	int value;
+	int *stack;
+} stack;
+
+int pop(stack *stack);
+void push(stack *stack, int value);
+void deinitstack(stack *stack);
+stack *initstack(int value, int size);
diff --git a/comp/work/42/rpn/stack.o b/comp/work/42/rpn/stack.o
new file mode 100644
index 0000000..05aa2e6
--- /dev/null
+++ b/comp/work/42/rpn/stack.o
diff --git a/comp/work/42/rpn/test.rpn b/comp/work/42/rpn/test.rpn
new file mode 100644
index 0000000..02f9f8a
--- /dev/null
+++ b/comp/work/42/rpn/test.rpn
@@ -0,0 +1 @@
+2 ~ 4 +