Add an undo function using pop implementation of stack in C LANGUAGE. NOTE: modify the following code, I don't want a new code.
Add an undo function using pop implementation of stack in C LANGUAGE.
NOTE: modify the following code, I don't want a new code.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct node{
char data[100];
struct node* next;
};
int elements = 0;
// function for add values to stack
struct node* add(struct node* stack, char *str){
struct node* tp = (struct node*)malloc(sizeof(struct node)) ;
strcpy(tp->data,str);
tp->next = stack;
elements++;
return tp;
}
//print function
int print(struct node* stack,int idx){
if(stack == NULL)
return 0;
idx = print(stack->next,idx);
if(idx<elements)
printf("%s\n",stack->data);
return idx+1;
}
//function for save in file
int save_command(FILE* filePointer, struct node* stack,int idx)
{
if(stack == NULL){
return 0;
}
idx = save_command(filePointer, stack->next,idx);
if(idx<elements)
fprintf(filePointer,"%s\n",stack->data);
return idx+1;
}
//main function
int main(){
//stacks for undo and redo
struct node *stack1 = NULL;
char input[100];
while(1==1){
printf("MyCommand > ");
gets(input);
if(strcmp("print",input)==0){ //if input is print
printf("result >\n");
print(stack1,elements);
}
else if(strcmp("save", input)==0){ //if input is save
FILE* filePointer;
filePointer=fopen("output.txt","w");
save_command(filePointer,stack1,elements);
fclose(filePointer);
}
else if(strcmp("quit",input)==0) //if input is quit
{
FILE* filePointer;
filePointer=fopen("output.txt","w");
save_command(filePointer,stack1,elements);
fclose(filePointer);
printf("result > Good Bye!\n");
exit(0);
}
else //if input is any other string add to stack
stack1 = add(stack1,input);
}
return 0;
}
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