Pending changes exported from your codespace

stack.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+
+typedef struct stack
+{
+    char data[64];
+    int top;
+} stack;
+int empty(stack *p)
+{
+    return (p->data == -1);
+}
+int top(stack *p)
+{
+    return (p->data[p->top]);
+}
+void push(stack *p, char a)
+{
+    p->data[++(p->top)] = a;
+    return;
+}
+void pop(stack *p)
+{
+    if (!empty(&p))
+    {
+        p->top--;
+    }
+    return;
+}
+int main()
+{
+    stack s;
+    s.top = -1;
+    char str[10] = "ABCDE";
+    int i, len;
+    len = sizeof(str);
+    for (i = 0; i < len; i++)
+    {
+        push(&s, str[i]);
+    }
+    printf(" string\n ");
+    for (i = 0; i < len; i++)
+    {
+        printf("%c", s.data[i]);
+    }
+    printf("\n");
+    printf(" reverse string\n ");
+    for (i = 0; i < len; i++)
+    {
+        printf("%c", top(&s));
+        pop(&s);
+    }
+    printf("\n");
+
+    return 0;
+}