Question

write a program to input a number and check if it is a happy number or not using user defined function.​

Answer 1

Answer:

Input: n = 19

Output: True

19 is Happy Number,

1^2 + 9^2 = 82

8^2 + 2^2 = 68

6^2 + 8^2 = 100

1^2 + 0^2 + 0^2 = 1

As we reached to 1, 19 is a Happy Number.

Input: n = 20

Output: False

Explanation:

// method return true if n is Happy Number

// numSquareSum method is given in below detailed code snippet

int isHappyNumber(int n)

{

set<int> st;

while (1)

{

n = numSquareSum(n);

if (n == 1)

return true;

if (st.find(n) != st.end())

return false;

st.insert(n);

}

}

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Answer 2

Answer:

Answer:

Input: n = 19

Output: True

19 is Happy Number,

1^2 + 9^2 = 82

8^2 + 2^2 = 68

6^2 + 8^2 = 100

1^2 + 0^2 + 0^2 = 1

As we reached to 1, 19 is a Happy Number.

Input: n = 20

Output: False

Explanation:

// method return true if n is Happy Number

// numSquareSum method is given in below detailed code snippet

int isHappyNumber(int n)

{

set<int> st;

while (1)

{

n = numSquareSum(n);

if (n == 1)

return true;

if (st.find(n) != st.end())

return false;

st.insert(n);

}

}