Term
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Definition
| An identifier is the name of a variable (or other item). It must start with either a letter or an underscore. The following must be letters, digits or underscores. |
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Term
| What does it mean to declare a variable? |
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Definition
When you declare a variable you are telling the compiler what kind of data you will be storing in the variable.
i.e. int, double |
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Term
| Where do you declare variables? |
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Definition
| Either just before it is used or at the start of the main part of your program. |
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Term
| What is the problem with an uninitialized value? |
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Definition
| This is a variable that has not been given a value. Once ran the variable will be filled with a 'garbage value'. |
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Term
| What is the three lines with will set a decimal to 2 places? |
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Definition
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2); |
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Term
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Definition
| A double is a variable storage with decimal places, up to 14 places of accuracy. |
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Term
| What is the memory used and precision of each of the following: short, int, long, float, double, and long double? |
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Definition
A short uses 2 bytes.
An int uses 4 bytes.
A long uses 4 bytes.
A float uses 4 bytes and has 7 digits of precision.
A double uses 8 bytes and has 15 digits.
A long double uses 10 bytes and has 10 digits. |
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Term
| What are boolean expressions? |
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Definition
| Boolean expressions evaluate to one or the two values, true or false. |
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Term
| What is the precedence of operators? |
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Definition
| ++ or --, ( ), static_cast, * or /, %, + or - |
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Term
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Definition
Flow of control is the order in which statements are executed.
i.e. branching and looping |
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Term
| What is an if-else statement and when is it used? |
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Definition
An if-else statement is used if there are two options needed for the program.
Ex. IF this is true, do this,
ELSE, do this.
Code: if (x>0)
y=x + 9;
else
y=x; |
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Term
| What is a boolean expression? |
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Definition
A boolean expression is any expression that is either true or false. An if-else statement always contains a boolean expression. It uses ==, !=, <= or >=. It also uses && (combined if, both must be true) and || (or).
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Term
| What is a compound statement? |
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Definition
A compound statement is a list of statements enclosed in a pair of braces. A compound statement is treated as one single statement by C++.
code: if (x>0)
{cout << "blah blah";
y=x+9; }
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