Chapter 4

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Chapter 4

Parameters and Overloading

This activity contains 10 questions.

What will the following program fragment output?


void foo(int x)
{
   int y = 4;
   x = 10;
   cout << x << " " << y;
}

int main()
{
   int x=2, y=3;
   foo(x);
   cout << x << "  " << y;
   return 0;
}

10 4 2 32 3 10 410 4 10 410 4 10 3

What will the following program fragment output?


void foo(int &x)
{
   int y = 4;
   x = 10;
   cout << x << " " << y;
}

int main()
{
   int x=2, y=3;
   foo(x);
   cout << x << "  " << y;
   return 0;
}

10 4 2 310 4 10 310 4 10 42 3 10 4

What will the following program fragment output?

void swap(int &x, int &y)
{
    x=y;
    y=x;
}

int main()
{
   int x=2, y=3;
   swap(x,y);
   cout << "X=" << x << "  Y=" << y;
   return 0;
}

X=2 Y=3X=3 Y=3X=3 Y=2X=2 Y=2

Which of the following is not allowed in overloading a function?

Two functions have identical parameter lists but different return types.Two functions can have the same name.Two functions have the same name and one takes parameters of type integer while another takes parameters of type long.Two functions have the same name and the same type of parameters, but one function takes two parameters while the other takes only one parameter.

What is the output of the following code snippet?


void printMoney(int dollars, int cents = 0)
{
   cout << dollars << " dollars and " << cents << " cents.";
   return;
}

int main()
{
  printMoney(2,50);
  printMoney(4);
  return 0;
}

2 dollars and 50 cents 4 dollars and cents2 dollars and 50 cents 4 dollars and 50 centsThis program will give an error message because the number of parameters on printMoney(4) do not match.2 dollars and 50 cents 4 dollars and 0 cents

Which of the following statements is most similar to the following?

x = ComputeValue();
assert(x>=0);

x = ComputeValue();
x = -1;

x = ComputeValue();
if (x>=0) {
   cout << "Error, value is non-negative.";
   exit(0);
}

x = ComputeValue();
if (x<0) {
   cout << "Error, value is negative.";
   exit(0);
}

x = ComputeValue();
x = 0;

Which of the following is not a recommended practice for writing a large program consisting of many functions?

Write a combination of general and specific functions, testing incrementally using both stubs and driver programs.Write the most general functions first and test them using stubs for more specific functions before writing the details of the more specific functions.Write the most specific functions first and test them using a driver program before writing more general functions.Write all of the functions at once before running the resulting program.

What will the following program output?


void foo(int x);

int main()
{
  int x=1;
  cout << "Before foo, X=" << x;
  foo(x);
  cout << "  After foo, X=" << x;
  return 0;
}

void foo(int x)
{
   x = 2;
   cout << "In foo, X = " << x;
   return;
}

Before foo, X=1 In foo, X=2, After foo, X=1Before foo, X=1 In foo, X=2, After foo, X=2Before foo, X=2 In foo, X=2, After foo, X=2Before foo, X=1 In foo, X=1, After foo, X=1

What will the following program output?


void foo(int x);
int x;

int main()
{
  x=1;
  cout << "Before foo, X=" << x;
  foo(x);
  cout << "  After foo, X=" << x;
  return 0;
}

void foo(int x)
{
   x = 2;
   cout << "In foo, X = " << x;
   return;
}

Before foo, X=1 In foo, X=2, After foo, X=1Before foo, X=1 In foo, X=2, After foo, X=2Before foo, X=1 In foo, X=1, After foo, X=1Before foo, X=2 In foo, X=2, After foo, X=2

Given a function with a reference parameter such as: void foo(int &x) Which of the following calls would give an error message?

int z;
void main()
{
 foo(z);
 return 0;
}

void main()
{
 int y;
 foo(y);
 return 0;
}

void main()
{
 foo(10);
 return 0;
}

void main()
{
 int x;
 foo(x);
 return 0;
}

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Chapter 4

What will the following program fragment output?
void foo(int x) { int y = 4; x = 10; cout << x << " " << y; } int main() { int x=2, y=3; foo(x); cout << x << " " << y; return 0; }

What will the following program fragment output?
void foo(int &x) { int y = 4; x = 10; cout << x << " " << y; } int main() { int x=2, y=3; foo(x); cout << x << " " << y; return 0; }

What will the following program fragment output?
void swap(int &x, int &y) { x=y; y=x; } int main() { int x=2, y=3; swap(x,y); cout << "X=" << x << " Y=" << y; return 0; }

Which of the following is not allowed in overloading a function?

What is the output of the following code snippet?
void printMoney(int dollars, int cents = 0) { cout << dollars << " dollars and " << cents << " cents."; return; } int main() { printMoney(2,50); printMoney(4); return 0; }

Which of the following statements is most similar to the following?
x = ComputeValue(); assert(x>=0);

Which of the following is not a recommended practice for writing a large program consisting of many functions?

What will the following program output?
void foo(int x); int main() { int x=1; cout << "Before foo, X=" << x; foo(x); cout << " After foo, X=" << x; return 0; } void foo(int x) { x = 2; cout << "In foo, X = " << x; return; }

What will the following program output?
void foo(int x); int x; int main() { x=1; cout << "Before foo, X=" << x; foo(x); cout << " After foo, X=" << x; return 0; } void foo(int x) { x = 2; cout << "In foo, X = " << x; return; }

Given a function with a reference parameter such as: void foo(int &x) Which of the following calls would give an error message?

Chapter 4

What will the following program fragment output? void foo(int x) { int y = 4; x = 10; cout << x << " " << y; } int main() { int x=2, y=3; foo(x); cout << x << " " << y; return 0; }

What will the following program fragment output? void foo(int &x) { int y = 4; x = 10; cout << x << " " << y; } int main() { int x=2, y=3; foo(x); cout << x << " " << y; return 0; }

What will the following program fragment output? void swap(int &x, int &y) { x=y; y=x; } int main() { int x=2, y=3; swap(x,y); cout << "X=" << x << " Y=" << y; return 0; }

Which of the following is not allowed in overloading a function?

What is the output of the following code snippet? void printMoney(int dollars, int cents = 0) { cout << dollars << " dollars and " << cents << " cents."; return; } int main() { printMoney(2,50); printMoney(4); return 0; }

Which of the following statements is most similar to the following? x = ComputeValue(); assert(x>=0);

Which of the following is not a recommended practice for writing a large program consisting of many functions?

What will the following program output? void foo(int x); int main() { int x=1; cout << "Before foo, X=" << x; foo(x); cout << " After foo, X=" << x; return 0; } void foo(int x) { x = 2; cout << "In foo, X = " << x; return; }

What will the following program output? void foo(int x); int x; int main() { x=1; cout << "Before foo, X=" << x; foo(x); cout << " After foo, X=" << x; return 0; } void foo(int x) { x = 2; cout << "In foo, X = " << x; return; }

Given a function with a reference parameter such as: void foo(int &x) Which of the following calls would give an error message?

What will the following program fragment output?
void foo(int x) { int y = 4; x = 10; cout << x << " " << y; } int main() { int x=2, y=3; foo(x); cout << x << " " << y; return 0; }

What will the following program fragment output?
void foo(int &x) { int y = 4; x = 10; cout << x << " " << y; } int main() { int x=2, y=3; foo(x); cout << x << " " << y; return 0; }

What will the following program fragment output?
void swap(int &x, int &y) { x=y; y=x; } int main() { int x=2, y=3; swap(x,y); cout << "X=" << x << " Y=" << y; return 0; }

What is the output of the following code snippet?
void printMoney(int dollars, int cents = 0) { cout << dollars << " dollars and " << cents << " cents."; return; } int main() { printMoney(2,50); printMoney(4); return 0; }

Which of the following statements is most similar to the following?
x = ComputeValue(); assert(x>=0);

What will the following program output?
void foo(int x); int main() { int x=1; cout << "Before foo, X=" << x; foo(x); cout << " After foo, X=" << x; return 0; } void foo(int x) { x = 2; cout << "In foo, X = " << x; return; }

What will the following program output?
void foo(int x); int x; int main() { x=1; cout << "Before foo, X=" << x; foo(x); cout << " After foo, X=" << x; return 0; } void foo(int x) { x = 2; cout << "In foo, X = " << x; return; }