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True. Remove the second variable, it achieves the same result with only one variable.

int main()
{
int num = 0;
int total = 0;

do{
cout << "Enter a number: " <<...

if ((mark >=0) && (mark <=25))
cout << "cat_1";



This does nothing to update the integer variables, this only displays "cat_1" on the screen. Instead, increment the variables...