init commit

1 files changed, 61 insertions, 0 deletions

diff --git a/src/stack.c b/src/stack.c
new file mode 100644
index 0000000..2fe3488
--- /dev/null
+++ b/src/stack.c
@@ -0,0 +1,61 @@
+#include "stack.h"
+#include <stdio.h>
+
+#define STACK_SIZE 100
+
+struct stack_st {
+    int len;
+    int arr[STACK_SIZE];
+};
+
+struct stack_st stack = { .len = 0, .arr = {0}};
+
+// Functions
+
+void stackPush(int val){
+  if (stack.len >= STACK_SIZE){
+	printf("Stack overrflow\n");
+	return;
+  }
+  stack.arr[stack.len] = val;
+  stack.len++;
+  return;
+}
+
+
+int stackPop(void){
+  if (stackIsEmpty()){
+	return 0;
+  }
+  int stackPopped = stack.arr[--stack.len];
+  return stackPopped;
+}
+
+
+int stackIsEmpty(void) {
+    return !(stack.len > 0);
+}
+
+
+int stackPeek(){
+	// To avoid funking up the stack.len
+	if (stackIsEmpty()) return 0;
+	else if (stack.len == 1) return stack.arr[1];
+	else{
+		int x = stackPop();
+		stackPush(x);
+		return x;
+	}
+}
+
+
+void stackPrint(){
+	while(1){
+		if(stackIsEmpty())
+			break;
+
+		int x = stackPop();
+		printf("%d\n", x);
+	}
+	return;
+}