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copied!<p>Really you are not modifying stack. You must to use &stack for push, pop and empty methods. They will have following signature:</p> <pre><code>void push(Stack * stack, int type, void* value); void pop(Stack * stack, Node* node); void empty(Stack *stack); </code></pre> <p>and, of course, use pointer contents inside these methods, like:</p> <pre><code>void push(Stack * stack, int type, void* value) { int length; Node* node = (Node*) malloc(sizeof(Node)); node->index = (*stack)->index + 1; node->type = type; switch(node->type) { case INT: node->value.i = *((int*) value); break; case CHAR: node->value.c = *((char*) value); break; case STRING: length = strlen((char*) value) + 1; node->value.s = (char*) malloc(length * sizeof(char)); strcpy(node->value.s, value); break; } node->prev = *stack; *stack = node; } void pop(Stack * stack, Node* node) { int length; Node* temp = *stack; if (!isempty(*stack)) { node->index = (*stack)->index; node->type = (*stack)->type; switch((*stack)->type) { case INT: node->value.i = (*stack)->value.i; break; case CHAR: node->value.c = (*stack)->value.c; break; case STRING: length = strlen((*stack)->value.s) + 1; node->value.s = (char*) malloc(length * sizeof(char)); strcpy(node->value.s, (*stack)->value.s); free((*stack)->value.s); break; } node->prev = 0; *stack = (*stack)->prev; free(temp); } else { /*TODO: handle empty case */ puts("Stack empty!"); } } void empty(Stack *stack) { while (!isempty(*stack)) { Node* temp = malloc(sizeof(Node)); pop(stack, temp); free(temp); } } </code></pre>

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