how can I write a simple while loop that sums the first 20 odd integers

Answer 1

while (((num%2)!=0) && (i <=20)){
oddnumsum += num;
i++;
}

Answer 2

Int sum=0;
for(int i=1,count=0;count<20;i=i+2,count++){ sum+=i; }

Cout<<sum;

Answer 3

Or, if you want a while loop

Int sum =1;
Int count =1;
Int i=1;
While (count++,i= i+2, count <=20){
sum+=i;
}
Cout <<sum;

Answer 4

int sum = 0;
Int i = 1;

while(i < 20){
sum += i;
i += 2;
}

cout << sum;