This article describes an implementation of the Stack Structure.
To program a Stack, we need to understand the interface of a Stack.
The Push Function adds an item to the Stack, the item goes on top of the Stack. We can use a linked list to implement a Stack and append/remove from the head of the list.
A function to push a node onto the Stack.
int push( Node ** stack, int content ){ Node * node; if( !stack ){ return -1; } node = newNode( content ); if( !node ){ return -2; } return addNode( stack, node ); }
Simply remove the node at the head of the list and return it, or return error if the list is empty.
A function to pop a node from the Stack.
int pop( Node ** stack, int * content ){ if( !stack || !content ){ return -1; } if( !*stack ){ return -2; } *content = (*stack)->content; return removeNode( stack, *stack ); }
Checking if the list is empty or null will determine if the Stack contains anything or not.
A function determine if the Stack is empty.
int isEmpty( Node * stack ){ if( !stack ){ return -1; } if( !*stack ){ return 0; } return 1; }
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