Online Time 10/8

Topics

*** NO OFFICIAL NOTICE OF CAMPUS CLOSURE YET ***

Questions / Requests

1. Example: quadratic equation

*** These are topics that would normally be discussed in the classroom lecture ***

2. Compound assignment operators

3. Increment and decrement operators

4. Formatted output

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+=

int x = 3, y = 2;

//x + y 

//x = x + y;

x += y;  // x is 5 and y is 2

x *= 2;  // x is 10

x -= 3;  // x is 7

x /= 3;  // x is 2

x += 7;  // x is 9

x %= 4;  // is 1

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int seconds = 57;

seconds += 1; seconds %= 60;
seconds += 1; seconds %= 60;
seconds += 1; seconds %= 60;

a + b => the sum is stored in stack memory

c += d => the sum of c and d is stored in stack memory.
          then that memory location is copied into c

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Increment operator

only operator on integer types
(int, long, short, unsigned, char, ...)

int i = 6;
cout << i << endl;  // 6
i++;   // postfix increment operator
cout << i << endl;  // 7

i += 1;
i = i + 1;

++i;   // prefix increment operator

Decrement operator

only operator on integer types

int i = 6;
cout << i << endl;  // 6
i--;   // postfix decrement operator
cout << i << endl;  // 5

i -= 1;
i = i - 1;

--i;   // prefix decrement operator
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non-parameterized manipulator
endl
boolalpha


setw is a parameterized manipulator