Answer:
result=0;
for (i=lo ; i<=hi; i++){
result += i;
}
Explanation:
The question says result was declared but not initialized, so using result without initializing it to 0 would throw an error as result would be undefined and you can't add a number to undefined
Another way to do it to keep everything inside the loop would be
for (i=lo ; i<=hi; i++){
if (i==lo) result= 0;
result += i;
}
but this is impractical since it would add unnecesary operations in each cycle of the loop