CPA Chapter 4 Assessment Answers 100%

What happens when you attempt to compile and run the following code?

#include <iostream>

using namespace std;

int main() {

char   t[3][3], *p = (char *)t;

for(int i = 0; i < 9; i++)

*p++ = ‘a’ + i;

cout << t[1][1];

return 0;
}

• It prints g

• It prints c
• Compilation fails
• It prints e

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
float *ft[3] = { new float[3], new float[3], new float[3] }, *p;

for(int i = 0; i < 3; i++) {
p = ft[i];
*p = p[1] = *(p + 2) = 10 * i;
}
cout << ft[1][1];
delete [] ft[0];
delete [] ft[1];
delete [] ft[2];
return 0;
}

• It prints 20
• It prints 30
• It prints 10
• Compilation fails

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
int *it[3];

for(int i = 0; i < 3; i++) {
it[i] = new int [i + 1];
for(int j = 0; j < i + 1; j++)
it[i][j] = 10 * i + j;
}
cout << it[2][2];
for(int i = 0; i < 3; i++)
delete [] it[i];
return 0;
}

• It prints 33
• It prints 22
• It prints 11
• Compilation fails

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
short s = 1;
int i = 2;
long l = 3;
float f = 4.4;
double d = 6.6;

cout << s/i + f/i + d/s;
return 0;
}

• It prints 4.4
• Compilation fails
• It prints 6.6
• It prints 8.8

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
short s = 1;
int i = 2;
long l = 3;
float f = 4.4;
double d = 6.6;

cout << s/float(i) + int(f)/i + long(d)/s;
return 0;
}

• It prints 8.5
• It prints 8.0
• Compilation fails
• It prints 8.8

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
int i = 2;
float f = 5.8;

f = (int)f;
i = (float) i;
cout << f/i;
return 0;
}

• It prints 3
• It prints 2.5
• Compilation fails
• It prints 2

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
int i = 2;
float f = 4.4;

cout << f % float(i);
return 0;
}

• It prints 0.2
• Compilation fails
• It prints 0
• It prints 2

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
int i = 2;
string s = “2”;

cout << s + i;
return 0;
}

• It prints 4
• It prints 22
• It prints 2
• Compilation fails

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
string s = “a”;

cout << s  << “b” + “c”;
return 0;
}

• Compilation fails
• It prints ab
• It prints a
• It prints abc

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
string s = “a”;

cout << s + “b” + “c”;
return 0;
}

• It prints ab
• It prints abc
• Compilation fails
• It prints a

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
string s1 = “ab”;
string s2 = “Abc”;

if(s1 > s2)
cout << “yes”;
else
cout << “NO”;
return 0;
}

• It prints NO
• It prints nothing
• Compilation fails
• It prints yes

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
string s1 = “Ab”;
string s2 = “Abc”;

cout << s1.compare(s1);
return 0;
}

• Compilation fails
• It prints -1
• It prints 1
• It prints 0

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

int main() {
string s1 = “1”;
string s2 = “12”;

cout << s1.compare(s2);
return 0;
}

• It prints 1
• It prints -1
• Compilation fails
• It prints 0

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
string s = “0123456789”;
cout << s.substr(3,7).substr(2).substr();
return 0;
}

• Compilation fails
• It prints an empty string
• It prints 56789
• It prints 34567

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
string s = “ABCDEF”;
for(int i = 1; i < s.length(); i += 2)
s[i – 1] = s[i] + ‘a’ – ‘A’;
cout << s;
return 0;
}

• Compilation fails
• It prints bBdDfF
• It prints BBDDFF
• It prints aAcCeE

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
string s = “AB”;
s.append(s).push_back(s[s.length() – 1]);
cout << s;
return 0;
}

• Compilation fails
• It prints ABABA
• It prints ABABB
• It prints ABAB

What happens when you attempt to compile and run the following code?

#include <iostream>
#include <string>
using namespace std;

int main() {
string s1 = “aleph”;
string s2 = “alpha”;
string s;
s1.swap(s2);
s2.swap(s);
s.swap(s2);
cout << s2;
return 0;
}

• Compilation fails
• It prints aleph
• It prints alpha
• It prints an empty string

What happens when you attempt to compile and run the following code?

#include <iostream>

namespace SpaceA {
int A;
}

namespace SpaceB {
int A;
}

using namespace SpaceA, SpaceB;

int main() {
SpaceA::A = SpaceB::A = 1;
std::cout << A + 1;
return 0;
}

• Compilation fails
• It prints 0
• It prints 1
• It prints 2

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

namespace S1 {
int A = 1;
}

namespace S2  {
int A = 2 ;
}

int main(void) {
{ using namespace S1;
S2::A = A + 1;
}
{ using namespace S2;
S1::A = A + 1;
}
cout << S1::A << S2::A;
return 0;
}

• It prints 23
• Compilation fails
• It prints 33
• It prints 32

What happens when you attempt to compile and run the following code?

#include <iostream>
using namespace std;

namespace S {
int A = 1;
}

namespace S {
int B = A + 2 ;
}

int main(void) {
S::A = S::A + 1;
{ using namespace S;
++B;
}
cout << S::B << S::A;
return 0;
}

• It prints 32
• It prints 42
• Compilation fails
• It prints 22