Question

num = 100;

while (num <= 150)

num = num + 5 ;

cout<< num

Assume all variables are properly declared. What is the output of the C++ code above?

Answer:

A) 150

B) 155

C) 160

d) 165

Answer 1

num = 100;  // num is initialized to 100
while (num <= 150)
    num = num + 5;
// let's see what happens with the above for loop
// num = 100
// iteration 1, num = num+5 = 100+5 = 105
// iteration 2, num = num+5 = 105+5 = 110
// iteration 3, num = num+5 = 110+5 = 115
...
// iteration 10, num = num+5 = 145+5 = 150
// iteration 11, num = num+5 = 150+5 = 155
// now num <= 150 is false, because 155 <= 150 is false. so, while loop stops.
// final value of num is 155
cout<< num; // output here is 155

Answer: 155