Write a visual logic program that prompts the user for a whole number, n, that is less than or equal 50
and greater than 0. if the user enters an invalid number end the program. output the summation of the
odd numbers from 1 to n (if n is odd or n-1 if n is even. for example, if the user enters 15, the output
should be 64 (1+3+5+7+9+11+13+15.) if the user entered 12, the output should be 36 (1+3+5+7+9+11.)

//program in C++(Visual studio).

#include <bits/stdc++.h>

using namespace std;

// main function

int main()

{

// variable

int num;

cout<<"Enter a number greater than 1 and less than 51:";

// read input number

cin>>num;

// check input is in between 1-50

if(num<=1||num>50)

{

    cout<<"Invalid input!!"<<endl;

    // exit the program

    exit;

}

else

{

// sum variable

    int sum=0;

    // find sum of all odd numbers

    for(int a=1;a<=num;a++)

    {

        if(a%2!=0)

        sum+=a;

    }

    // print sum

    cout<<"Sum of odd numbers from 1 to "<<num<<" is:"<<sum<<endl;

}

return 0;

}

Explanation:

Read a number from user and assign it to variable "num".If input number

is less than 1 or greater than 50 exit the program.otherwise find the sum

of all odd numbers from 1 to "num".Print the sum of odd numbers.

Output:

Enter a number greater than 1 and less than 51:-5                                                                          

Invalid input!!

Enter a number greater than 1 and less than 51:55                                                                          

Invalid input!!

Enter a number greater than 1 and less than 51:15                                                                          

Sum of odd numbers from 1 to 15 is:64

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