Midterm Exam: Discussion Examples 




C++ FUNDAMENTALS (Given these code segments)
1) Are these syntactically OK (will compile)?
a)   int         it      = 100;
b)   int         is, not //; 
c)   const int   BIG;
d)   const int   BIGGER  = 10;
e)   const int   BIGGEST = it;
f)   it = BIGGER;
g)   BIGGER = it;

2) What gets printed? 
    int  i = 3, j = 3, k;
    k = ++i + ++j + 2 ;
    cout << i << " " << j << " " << k << endl;
    i = j = 3;
    k = i++ + j++ + 2 ;
    cout << i << " " << j << " " << k << endl;

LOOPS 
3)   Write a for loop to print the same output as while loop below.
 a)  Write a do  loop to print the same output as while loop below.
 b)  What gets printed if it was "while ( i = 5 )" instead ? 
  int i = 1;
  while ( i < 5 )
  { 
    ++i;
    cout << i << endl;
  }

4) What gets  printed? 
  int i, j; 
  for ( i = 1; i < 3; ++i )
    for ( j = 0; j < 3; ++j )
      cout << i << " " << j << endl;

DECISIONS
5) Write a switch to compute same as if else statement. 
  int  i = 1;
  if ( i == 1 || i == 2 )
    ++i;
  else if ( i == 3 )
  {
    cout <<  i <<  endl;
    i--;
  }
  else
    i--;
  
FUNCTIONS
6) What is missing?  
  a) What gets printed now? 
  b) Is "i" in fn() same as in main()?
  c) Write fn() to be an overloaded function accepting a formal parameter type 
     float.
  d) Write int fn(int); to be an inline function.
  e) Write int fn(int); to be assigned a default initializer of 1.
  f) What makes an overloaded function?
  g) What is printed if line 3 omitted the assignment?  "fn(i);"
       1) #include 
       2) int main(void)
       3) {
       4)    int i = 1 ;
       5)    i = fn (i );
       6)    cout << i << endl;
       7)    cout << fn(i) << endl;
       8)    return 0;
       9) }
      10) int fn ( int i ) { return(i + 2); }

7)  Are these legal?
a) int fn (int i = 0, j = 1, int k); 
b) fn (1, 2, int k = 3);

REFERENCE TYPES
8) What gets printed?
#include 
void fn ( int & rj );
int main(void)
{
   int i = 1, j = 3, &ri = i;
   ++i;
   cout << i << "  " << ri << endl;
   fn (j);
   cout << j << endl;
   return 0;
}
void fn ( int & rj ) { rj = 4; }