For the following code, what should be filled in the blank (....) for the string to be outputted 100 times? string str = "Hello\n"; int i = 0; do{     cout << str; }while(++i < ....); Group of answer choices 99 100 98 101 None of the above   ==========================   A variable has ___________ scope when it is declared within { }. Group of answer choices block global variable None of these =====================   For the following code, what is the valid scope for variable "var"? int main(){            for(int var = 0; var < 5; var++){                    function1(var);            } return 0; } Group of answer choices Only in Main Only in the for-loop Both the for-loop and main Both for-loop and function1 Only in function1 All of the above

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.