Question

How do you write a while loop that ends after the exact same word has been entered twice by the user?

Answer 1

NOTE: Since the language is not specified I have done it in the Python. The logic remains constant and the reading of input changes, Storing the data in the type of data type differs like an array in Java, C, C++. Please check the logic

EXPLANATION: Explanation in the comments

SOLUTION:

word=[]
##list to store input words

loopBreak=0
##variable to store the loop break condition

while(loopBreak==0):
##read input word
string=input("Enter Word")

for i in range(len(word)):
##check if the enter word is in the list or not if it there in the list break the loop
##by changing the counter and break the current loop
if(word[i]==string):
print("You have entered a duplicate word")
loopBreak=1
break
##add the entered word to the list for comparison
word.append(string)

SOURCE CODE IMAGE:

File Edit Format Run Options Window Help word=[] ##list to store input words loopBreak=0 ##variable to store the loop break condition while (loopBreak==0): ##read input word string=input("Enter Word") for i in range (len (word)) : ##check if the enter word is in the list or not if it there in the list break the loop ##by changing the counter and break the current loop if(word[i]==string): print ("You have entered a duplicate word") loopBreak=1 break ##add the entered word to the list for compaision word.append(string)

OUTPUT:

RESTART: C:/Users/vinod/AppData/local/Programs/Python/Python37-32/duplicateword .py Enter Wordhii Enter Wordhii You have entered a duplicate word RESTART: C:/Users/vinod/AppData/Local/Programs/Python/Python37-32/duplicateWord .py Enter Wordhello Enter Wordhii Enter Wordhow are you Enter Wordhii You have entered a duplicate word