CSCI261 Lecture Questions C++ Repetition Structures
This worksheet is for your use during and after lecture. It will not be collected or graded, but I think you will find it a
useful tool as you learn C++ and study for the exams. Explain all false answers for the “True or False” questions; in
general, show enough work and provide enough explanation so that this sheet is a useful pre-exam review. I will be
happy to review your answers with you during office-hours, via Email, or instant messaging.
1. C++, like many programming languages, has repetition statements or looping structures. Explain precisely what
is being repeated when these are used.
2. Which repetition structure is most likely to have a “loop counter”?
3. How many question marks will be printed to the console?
1
fo r ( int i (0 ); i <5 ; i ++ ) {
2
fo r ( i nt j ( i ); j >= 1 ; j - - ) {
3
co ut << ’? ’ ;
4
}
5
}
6
cout << endl ;
4. Using an
if
statement and the
break
keyword, add code to the following program so that it terminates instead of
attempting the
sqrt()
of a negative number.
1
# in c lu de < io st re am >
2
# in c lu de < cm at h >
3
using namespace std;
4
5
int main()
6
{
7/ / V a r i a b l e t o be re a d fr o m us e r
8
do u b le x(0 );
9
wh i l e ( t rue ) {
10
11
co ut < < " En te r a nu mb e r fo r S QR T : " < <
12
endl;
13
ci n > > x ;
14
15
co ut < < " The S QRT of " << x << " is " < <
16
sq rt ( x ) << e nd l ;
17
18
}
19
20
return 0;
21
}
