Finding the sum(s) of ...

Write a program to find the sum of 1 to 100.

#include<iostream.h>

void  main()

{

      int i,s=0;

      for(i=1;i<=100;i++)

            s+=i;

      cout << "Sum of 1 to 100 is " << s;

}

Write a program to find the sum of even numbers 2 to 100.

#include<iostream.h>

void  main()

{

      int i,s=0;

      for(i=2;i<=100;i+=2)

            s+=i;

      cout << "Sum of even numbers 2 to 100 is " << s;

}

Write a program to find the sum of odd numbers 1 to 99.

#include<iostream.h>

void  main()

{

      int i,s=0;

      for(i=1;i<=99;i+=2)

            s+=i;

      cout << "Sum of even numbers 1 to 99 is " << s;

}

Write a program to find the sum of following sequence.

3, 10, 17, 24, 31, 38, 45, 52, 58, 65

#include<iostream.h>

void  main()

{

      int i,s=0;

      for(i=3;i<=65;i+=7)

            s+=i;

      cout << "Sum of the sequence is " << s;

}

Write a program to find the sum of following sequence.

1, 4, 9, 16, 25, 36, 49, 64, 81, 100

#include<iostream.h>

void  main()

{

      int i,s=0;

      for(i=1;i<=10;i++)

            s+=(i*i);

      cout << "Sum of the sequence is " << s;

}