Question

Write algorithm to calculate the sum of numbers between 1 to 100

Answer 1

Explanation:

STEP 1: START

STEP 2: INITIALISE A=0,B=1;

STEP 3: WHILE (B<=100)

STEP 4: GO TO STEP 5 OTHERWISE GO TO STEP 9

STEP 5: A=A+B;

STEP 6: B++;

STEP 7: REPEAT STEP 3 TO 6 UNTIL CONDITION IS TRUE.

STEP 8 : PRINT THE VALUE OF A.

STEP 9 : EXIT

Answer 2

C++ program:

#include<bits/stdc++.h>

using namespace std;

int sumOfDigits(int );

int sumOfDigitsFrom1ToN(int n)

{

   int result = 0;

   for (int x = 1; x <= n; x++)

       result += sumOfDigits(x);

   return result;

}

int sumOfDigits(int x)

{

   int sum = 0;

   while (x != 0)

   {

       sum += x %10;

       x   = x /10;

   }

   return sum;

}

int main()

{

   int n = 100;

   cout << "Sum of digits in numbers from 1 to " << n << " is "

        << sumOfDigitsFrom1ToN(n);

   return 0;

}