C++ Review on Tracing

Return to Topic Menu | Computer Science Main Page | MathBits.com | Terms of Use | Resource CD

Review Tracing Program Fragments

What screen output is produced by each of the following program fragments?

cout<< "W" << endl;
cout<< endl << "\n";
cout<< endl << "O" << endl;
cout<< "W" << endl;

for(int i = 2; i <=5; i++)
cout<< "*";
cout<< i;

apstring hero = "Indiana";
int count = 0;
while (count <=6)
{
     if (hero[count] =="d")
           continue;
     cout<< hero[count];
     count++;
}

int growl = 5;
int meow = growl++ * 3;
cout<< growl
      << " "
      << meow
      << endl;

int age = 30;
if (age <15)
     cout<< "Skeeter";
else if (age>20)
     cout<< "Duke";
else
     cout<< "Wally";

cout<< (10 - -8)/6 * 3 << endl;
cout<< 5 + -2*3 + 8/2 << endl;
cout<< 7/2 + 7%2;

int x = 3;
int y = 6;
if(x>=3)
     cout<< "Zip Drive"<< endl;
if((x<=3) && (y>6))
     cout<< "Scanner" << endl;
if((x<=3)||(y>6))
     cout<< "CD Burner";

int a = 1, b = 2;
while (b < 8)
{
b += a;
a += 3;
}
cout<< a << " " << b;

int i, j, sp;
for (i = 0; i <= 3; i++)
{
     for(sp=0; sp<=15-i; sp++)
          cout<< " ";
     for(j=1; j<=2*i+1; j++)
          cout<< "&";
     cout<< endl;
}

10.

cout<<setprecision(2)<<3.567;

11.

x = 2;
switch(x)
{
     case (1): cout<< "A";
     case (2): cout<< "B";
     case (3): cout<< "C";
}

12.

if (!3)
{
cout<< "Trick";
}
cout<< "Yes";

13.

#include <iostream.h>
void goodies(void);
void moreGoodies(int x, int y);
int grandGoodies(void);
int main(void)
{
     goodies( );
     int a = 2, b = 3;
     moreGoodies(a, b);
     cout<< a << " " << b << endl;
     cout<< grandGoodies( );
     return 0;
}
//**function definition
void goodies(void)
{
     cout<< "Goodies! \n";
     return;
}
//**function definition
int grandGoodies(void)
{
     return (100);
}
//**function definition
void moreGoodies(int x, int y)
{
     y = ++y - 1;
     x = x-- * 2;
     cout<< x << " " << y << endl;
     return;
}

14.

What is WRONG with this segment of code?

for ( int x = 6; x > 6; x--)
{
cout<< x;
}

15.

What is WRONG with this segment of code?

int num = 7;
do
{
cout<< "LookOut!";
num -= 2;
}
while (num != 2);

16.

What's wrong with this fragment of code?

int pop = 8;
do
{
cout<< "Howdy, partner!";
pop *= 2;
}
while (pop%2 == 0);

Return to Topic Menu | Computer Science Main Page | MathBits.com | Terms of Use | Resource CD