C++ Institute certification practice

CPP Practice Questions

Try 10 free CPP exam-style questions for C++ Institute CPP Certified Professional Programmer. Check each answer and review the explanation and source references.

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CPP
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C++ Institute
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What happens when you attempt to compile and run the following code? #include #include #include using namespace std; templatestruct Out { ostream & out; Out(ostream & o): out(o){} void operator() (const T & val ) { out<<val<<" "; } }; int main() { int t1[]={3,2,4,1,5}; int t2[]={5,6,8,2,1}; vector v1(10); sort(t1, t1+5); sort(t2, t2+5); set_symmetric_difference(t1,t1+5,t2,t2+5,v1.begin()); for_each(v1.begin(), v1.end(), Out(cout));cout<<endl; return 0; } Program outputs:
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What happens when you attempt to compile and run the following code? #include #include #include using namespace std; class A { int a; public: A(int a) : a(a) {} int getA() const { return a; } void setA(int a) { this?>a = a; } bool operator==(const A & b) const { return a == b.a; } }; bool compare(const A & a, const A & b) { return a == b; } int main () { int t[] = {1,2,3,3,5,1,2,4,4,5}; vector v (t,t+10); vector::iterator it = v.begin(); while ( (it = adjacent_find (it, v.end(), compare)) != v.end()) { cout<<it?v.begin()<<" ";it++; } cout<< endl; return 0; }
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What happens when you attempt to compile and run the following code? #include #include using namespace std; bool mycomparison (int first, int second){return first>second;} template void print(T start, T end) { while (start != end) { std::cout << *start << " "; start++; } } int main() { int t1[] ={ 1, 7, 8, 4, 5 }; list l1(t1, t1 + 5); int t2[] ={ 3, 2, 6, 9, 0 }; list l2(t2, t2 + 5); l1.sort(mycomparison); l2.sort(mycomparison); l1.merge(l2,mycomparison); print(l1.begin(), l1.end()); print(l2.begin(), l2.end()); cout<<endl; return 0; }
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What happens when you attempt to compile and run the following code? #include #include #include #include using namespace std; class B { int val; public: B(int v):val(v){} B(){} int getV() const {return val;} bool operator > (const B & v) const { return val>v.val;} }; ostream & operator <<(ostream & out, const B & v) { out<<v.getV(); return out;} templatestruct Out { ostream & out; Out(ostream & o): out(o){} void operator() (const T & val ) { out<<val<<" "; } }; int main() { int t[]={8, 10, 5, 1, 4, 6, 2, 7, 9, 3}; deque d1(t, t+10); sort(d1.begin(), d1.end(), greater()); deque::iterator it = lower_bound(d1.begin(), d1.end(), 4,greater()); for_each(it, d1.end(), Out(cout));cout<<endl; return 0; } Program outputs:
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What happens when you attempt to compile and run the following code? #include #include using namespace std; class A { int a,b; public: A(const A & c) { a = c.a; } A():a(0),b(0){} void setA(int a) {this?>a = a;} void setB(int b) {this?>b = b;} int getA() {return a;} int getB() {return b;} }; int main () { vectorv; A a; a.setA(10); a.setB(11); v.push_back(a); cout<<v[0].getB()<<" "<<v[0].getA()<<endl; return 0; }
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What will happen when you attempt to compile and run the code below, assuming that you enter the following sequence: one two three? #include #include using namespace std; int main () { string a; cin.getline(a); cout<<a<<endl; return 0; } Program will output:
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What happens when you attempt to compile and run the following code? #include #include #include using namespace std; class B { int val; public: B(int v):val(v){} int getV() const {return val;} bool operator < (const B & v) const { return val<v.val;} }; templatestruct Out { ostream & out; Out(ostream & o): out(o){} void operator() (const T & val ) { out<<val<<" "; } }; int main() { B t1[]={3,2,4,1,5}; B t2[]={5,6,8,2,1}; vector v1(10,0); sort(t1, t1+5); sort(t2, t2+5); set_difference(t1,t1+5,t2,t2+5,v1.begin()); for_each(v1.begin(), v1.end(), Out(cout));cout<<endl; return 0; } Program outputs:
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Which lines of the code below contain proper instantiation of queue objects? #include #include #include #include #include using namespace std; int main() { deque mydeck; list mylist; vector myvector; queue first; // line I queue second(mydeck);// line II queue third(second);// line III queue fourth(mylist);// line IV queue fifth(myvector);// line V return 0; }
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What happens when you attempt to compile and run the following code? #include #include #include using namespace std; class A { int a; public: A(int a) : a(a) {} int getA() const { return a; } void setA(int a) { this?>a = a; } operator int() const {return a;} }; int main () { int t[] = {1,2,3,2,3,5,1,2,7,3,2,1,10, 4,4,5}; set s (t,t+15); cout<<equal(s.begin(), s.end(), t)<<endl; return 0; } Program outputs:
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What will happen when you attempt to compile and run the following code? #include #include using namespace std; template class A { T_v; public: A() {} A(T v): _v(v){} T getV() { return _v; } void add(T & a) { _v+=a; } }; int main() { Aa("Hello"); string s(" world!"); a.add(s); cout << a.getV() <<endl; return 0; }
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