init

poly.c

@@ -0,0 +1,57 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+typedef struct {
+  int top;
+  int capacity;
+  char *array;
+} stack;
+
+stack *createStack(int c) {
+  stack *Stack = (stack *)malloc(sizeof(stack));
+  if (!Stack) {
+    return NULL;
+  }
+  Stack->capacity = c;
+  Stack->top = -1;
+  Stack->array = (char *)malloc(Stack->capacity);
+  if (!Stack->array) {
+    free(Stack);
+    return NULL;
+  }
+  return Stack;
+}
+
+bool isfull(stack *s) { return s->top == s->capacity - 1; }
+bool isempty(stack *s) { return s->top == -1; }
+
+int push(stack *s, char v) {
+  if (isfull(s)) {
+    printf("stack overflow");
+    return -1;
+  }
+  s->array[++s->top] = v;
+  return s->top;
+}
+int pop(stack *s) {
+  if (isempty(s)) {
+    printf("empty");
+    return -1;
+  }
+  return s->array[s->top--];
+}
+
+void display(stack *s) {
+  for (int i = 0; i <= s->top; i++) {
+    printf("%c", s->array[i]);
+  }
+}
+
+int main() {
+  stack *ms = createStack(3);
+
+  push(ms, 'a');
+  push(ms, 'b');
+  display(ms);
+}