Assume that x is a char variable has been declared and already given a value. Write an expression whose value is true if and only if x is a upper-case letter.

bool b = isupper (x);

Step-by-step explanation:

I have written the expression for a char variable x. The isupper (x) will return true if the character x is upper case and false if the character x is lower case.

I have stored the returned value to a bool variable b. So the value of variable b will be true only when the x is in uppercase and false when b is lower case.