Question

Write a program to accept a number from user and check if it's an amicable number or not using functions.

Answer 1

Explanation:

// CPP program to check if two numbers are

// Amicable or not.

#include <bits/stdc++.h>

using namespace std;

// Function to calculate sum of all

// proper divisors of a given number

int divSum(int n)

{

// Sum of divisors

int result = 0;

// find all divisors which divides 'num'

for (int i = 2; i <= sqrt(n); i++)

{

// if 'i' is divisor of 'n'

if (n % i == 0)

{

// if both divisors are same

// then add it once else add

// both

if (i == (n / i))

result += i;

else

result += (i + n/i);

}

}

// Add 1 and n to result as above loop

// considers proper divisors greater

// than 1.

return (result + 1);

}

// Returns true if x and y are Amicable

// else false.

bool areAmicable(int x, int y)

{

if (divSum(x) != y)

return false;

return (divSum(y) == x);

}

int main() {

int x = 220, y = 284;

if (areAmicable(x, y))

cout << "Yes";

else

cout << "No";

return 0;

}

Answer 2

Answer:

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