added xor

Home/PL/HW/Stack Calculator/head.h

@@ -0,0 +1,17 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+#include <ctype.h>
+
+typedef struct node {
+    int x;
+    struct node* next;
+}Plate;
+
+void print_plates(Plate* plates);
+Plate* push(Plate* plates, int x);
+Plate* remove_plate(Plate* plates);
+int pop(Plate** plates);
+int len(Plate* plates);
+int isnm(char *str);

Home/PL/HW/Stack Calculator/lib.c

@@ -0,0 +1,74 @@
+#include "head.h"
+
+void print_plates(Plate *plates)
+{
+    if (plates == NULL)
+    {
+        printf("[%p]\n", plates);
+        return;
+    }
+    while(plates){
+        printf("[%14p]->[%14p] ", plates, plates->next);
+        printf("data: [%4d]\n", plates->x);
+        plates = plates->next;
+    }
+    printf("-------------\n");
+}
+
+Plate* push(Plate* plates, int d){
+    Plate *temp = NULL;
+    if((temp=malloc(sizeof(Plate)))==NULL){
+        perror("malloc:NULL");
+        exit(2);
+    }
+    temp->x = d;
+    if(plates==NULL) temp->next=NULL;
+    else{
+        temp->next=plates;
+    } 
+    return temp;
+}
+
+Plate* del_head(Plate* plates){
+    Plate *temp=plates;
+    if(plates==NULL) return NULL;
+    if(plates->next==NULL){
+        free(plates);
+        return NULL;
+    }
+    plates = plates->next;
+    free(temp);
+    return plates;
+}
+
+int len(Plate* plates){
+    int ans = 0;
+    Plate *temp = plates;
+    if(plates==NULL) return 0;
+    while(temp){
+        ans++;
+        temp=temp->next;
+    }
+    return ans;
+}
+
+int pop(Plate** plates){
+    int i;
+    if(*plates==NULL){
+        printf("Error");
+        exit(4);
+    }
+    i = (*plates)->x;
+    *plates = del_head(*plates);
+    return i;
+}
+
+int isnm(char *str){
+    int i = 0, n = strlen(str);
+    for(i=0; i<n; i++){
+        if(!isdigit(str[i])){
+            return 0;
+        }
+    }
+    return 1;
+}

Home/PL/HW/Stack Calculator/main.c

@@ -0,0 +1,51 @@
+#include "head.h"
+
+int main(int argc, char *argv[]){
+    Plate *plates = NULL;
+    char c;
+	int i,j,k, ans = 0;
+    for (k=1; k < argc; k++){
+        if (isnm(argv[k])){
+            plates = push(plates, atoi(argv[k]));
+        }
+        else if (strlen(argv[k]) == 1 || !strcmp(argv[k], "*m")){
+            if (len(plates)<2){
+                printf("Not enough numbers");
+                exit(2);
+            }
+            if (!strcmp(argv[k], "*m")) c = '*';
+            else c = *argv[k];
+            i = pop(&plates);
+			j = pop(&plates);
+			switch(c){
+                case '+':
+				    plates = push(plates, j + i);
+				    break;
+			    case '-':
+				    plates = push(plates, j - i);
+				    break;
+			    case '*':
+				    plates = push(plates, j * i);
+				    break;
+			    case '/':
+				    plates = push(plates, j / i);
+				    break;
+                default:
+                    printf("You wrote something wrong");
+                    exit(3);
+            }
+        }
+        else{ 
+            printf("You wrote something wrong");
+            exit(7);
+        }
+    }	
+    if (len(plates)!=1){
+        printf("Not enough operations");
+        exit(4);
+    }
+	ans = pop(&plates);
+	printf("Result of line is %d\n", ans);
+
+    return 0;
+}