performing merge

Merge branch 'master' of git://git.seacrossedlovers.xyz/school

1 files changed, 56 insertions, 0 deletions

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); 
+}