#include<stdio.h> #include<stdbool.h> #include<stdlib.h> #include<string.h> #include "stacksADT.h" int main(void) { bool done = false; char* dataPtr; int N; STACK* stack; STACK* newStack; stack = createStack(); newStack = createStack(); while (!done) { dataPtr = (char*)malloc(sizeof(char)); printf ("Enter a word or /uN for undoing N words or /x to exit:"); scanf("%s", dataPtr); if(strcmp(dataPtr,"/x")==0 || fullStack (stack))//user quits entering done = true; else //user wants to enter more words or undo { //undo part if(strncmp(dataPtr,"/u",2)==0)//check first two entered characters if undo { N= atoi(dataPtr+2); while(N--) { popStack(stack); } } //if else { pushStack(stack, dataPtr); // push in to stack } } //else } // while while (!emptyStack(stack)) { dataPtr = (char*)popStack(stack); pushStack(newStack, dataPtr); } // while while (!emptyStack(newStack)) { dataPtr = (char*)popStack(newStack); printf("%s\t", dataPtr); free (dataPtr); } // while return 0; } This is how the output looks like: Eg: Enter word: I Enter word: love Enter word: icecream Enter word: /u2 Enter word: /x Output: I love I'm not getting this part right. Eg: Enter word : I Enter word: love Enter word: /u3 can undo only 2 words. Enter word: icecream Enter word: /x Output: icecream I need to add a printf statement to above code.this printf statement should be printed incase I input less words and try to undo more words. printf("Can undo only %d words\n", ??); what do I put inplace of ?? and where should this statement go??