Exploit return of integer values
(i >= j) + (i == j) → 0, 1, or 2 based on relation between
i and j

Calculating a Broker’s Commission
• When stocks are sold or purchased through a broker, the
broker’s commission often depends upon the value of the
stocks traded
• Suppose that a broker charges the amounts shown in the
following table:

Transaction Size Commission Rate
Under $2,500 $30+1.7%
$2,500-$6,250 $56 + 0.66%
$6,250-$20,000 $76 + 0.34%
$20,000-$50,000 $100 + 0.22%
$50,000-$500,000 $155 + 0.11%
Over $500,000 $255 + 0.09% 16/31

Programming Task
Calculating a Broker’s Commission
• The minimum charge is $39
• Write a program that asks the user to enter the amount of the
trade, then displays the amount of commission:
Enter value of trade: 30000
Commission: $166.00
• Use cascaded if statements to determine which range the
trade falls into


The “Dangling else” problem
• Solution:

if ( y != 0) {
if ( x != 0)
result = x / y;
}
else
printf("Error: y is 0\n");

if(y != 0)
if(x != 0)
result = x / y
else
printf("Error: x is 0\n");
else
printf("Error: y is 0\n");




Any number of statements are allowed 26/31

• If the default case is missing and controlling expression is
false, control passes to next statement after switch 28/31



total_checked


• Declared variable is not visible outside the loop
for (int i = 0; i < n; i++)
{
printf("%d\n", i); // Legal; i is visible
}
printf("%d", i); /*** WRONG ***/



17/27