stack

C/stack.c

@@ -0,0 +1,54 @@
+#define MAXSIZE 100
+struct stacks{
+    int st[100];
+    int top;
+};
+typedef struct stacks stack;
+void create(stack *s)
+{
+    s->top=-1;
+}
+void push(stack *s,int e)
+{
+    if(s->top==100-1)
+    {
+        printf("\n overflow");
+        exit(-1);
+    }
+    else{
+        s->top++;
+        s->st[s->top]=e;
+    }
+}
+int pop(stack *s)
+{
+    if(s->top==-1)
+    {
+        printf("stack uunderflow\n");
+        exit(-1);
+    }
+    else{
+   return( s->st[s->top--]);
+   }
+
+}
+int isempty(stack *s)
+{
+    if(s->top==-1)
+        return 1;
+    else
+        return 0;
+}
+int isfull(stack *s)
+{
+    if(s->top==MAXSIZE-1);
+}
+int main()
+{
+      stack A,B;
+      create(&A);create(&B);
+      push(&A,10);push(&B,20);
+      push(&A,30);
+      printf("%d %d\n",pop(&A),pop(&B));
+
+}