After: Professor Fell's Quiz 8

```void WriteArray(int A[], int N);
int  Hex2Dec( string HexNum );

void main()
{
// open text and drawing windows

//Problem 1----------------------------variables and assignment, cout
int x = 5, y = 7, z = 9;
cout << x << ' ' << y << ' ' << z << endl;
x = y + z;
y = x + z;
z = x + y;
cout << x << ' ' << y << ' ' << z << endl;
x = z - y;
y = z - x;
z = y - x;
cout << x << ' ' << y << ' ' << z << endl;
cout << endl;
cout << endl;

//Problem 2----------------------------------------integer arithmetic
int A = 5, B = 7, C;
C = A - B / 3 + A / 2;
cout << A << ' ' << B << ' ' << C << endl;

C = 10;
cout << A++ << ' ' << B++ << ' ' << C++ << endl;
cout << A++ << ' ' << B++ << ' ' << C++ << endl;
cout << endl;

A = 5, B = 7;
C = A / (B / A) * B;
cout << A << ' ' << B << ' ' << C << endl;
cout << endl;

//Problem 3-----------------------------------------------------loops
//Write a loop with this output:
//     6400 * 1600 * 400 * 100 * 25 * 6 * 1
//     Hint: What is special about division of integers?

//Problem 4-------------------------------------------------functions
// Write a function RectangleArea that has arguments width and height of
// type double and returns the area of the rectangle with that width and height.

//Problem 5--------------------------------------------------function
// Write a function IsOp returns true if and only if its char argument
// is '+', '-', '*', or '/'.
//   Note: This could be useful for an interactive calculator

//Problem 6----------------------------------------------------arrays
int AA[8] = { 3, 5, 4, 2, -1, 7, 0, 6 };

for (int J = 0; J < 8; J++)
if (AA[J] < 1) AA[J] = 1;
WriteArray(AA, 8);

for (int J = 0; J < 4; J++)
WriteArray(AA, J);

//
//  Write in base 10 (as normal decimal numbers) the following numbers:
//      2A,  C8,  FE,  35
//
//  Write in base 16 (as hexadecimal numbers):
//      16,  33,  180,  210
//
//  Write the above as binary numbers!
//
//  Write a Hex2Dec function that takes a hexadecimal number
//  (as a string) and returns its decimal form.
//  The following code must work (uncomment and run):
//
//  int z;
//  z = Hex2Dec( "AB" ) + 10 + Hex2Dec( "12" );
//  cout << z << endl;
}

void WriteArray(int A[], int N){
for (int J = 0; J < N; J++)
cout << J << ' ' << A[J] << endl;
cout << endl;
}

int Hex2Dec ( string HexNum )
{
int DecNum = 0;

// Write it !

return DecNum;
}
```

Last Updated: November 19, 1997 12:44 pm by
Sergey Bratus
College of Computer Science, Northeastern University