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Key to CSE390C Sample Midterm, Spring 2022 handout #4
1. Parameter Mystery. The program produces the following output.
elon! 3 11 musk? 18
elon!! 2 8 elon!? 16
elon!! 2 16 musk 18
2. Pointer Mystery. The program produces the following output.
6 0xaa00 *oe 13 b*den
9 0xdd00 *iden 11 **e
11 0xaa00 *oe 11 *iden
3. One possible solution appears below.
void replace_all(istream & in, char target, char replacement) {
string line;
while (getline(in, line)) {
for (char ch : line) {
if (ch == target) {
cout << replacement;
} else {
cout << ch;
}
}
cout << endl;
}
}
4. One possible solution appears below.
void remove_zeros(vector<int> & v) {
for (int i = v.size() - 2; i >= 0; i--) {
if (v[i] == 0) {
for (int j = i; j < v.size() - 1; j++) {
v[j] = v[j + 1];
}
v[v.size() - 1] = 0;
}
}
}
5. One possible solution appears below.
class multi_string {
public:
multi_string(int times, const string & the_text) {
count = times;
text = the_text;
}
string to_string() const {
string result;
for (int i = 0; i < count; i++) {
result += text;
}
return result;
}
int get_count() const {
return count;
}
void set_count(int new_count) {
count = new_count;
}
private:
int count;
string text;
};
6. One possible solution appears below.
ostream & operator<<(ostream & out, const vector<int> & v) {
out << "[";
if (v.size() > 0) {
out << v[0];
for (int i = 1; i < v.size(); i++) {
out << ", " << v[i];
}
}
out << "]";
return out;
}
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