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Questions and Answers
What occurs when using the getline function in C++?
What is the primary purpose of the cin.ignore() function?
Which output would be stored in str2 if the code 'cin >> str1; getline(cin, str2);' is used?
What will happen to leading whitespace when using getline?
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What does the syntax 'cin.ignore(intExp, chExp);' accomplish?
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What data type is suitable for storing a single character input?
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Which of the following describes how the cin extraction operator behaves with int input?
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What will firstString store after executing 'cin >> firstString;' with input 'Hello World'?
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When using cin to read a double, which of the following is true?
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If the variable 'firstStr' is filled with 'Oh my!' using cin, what will secondStr contain after 'cin >> secondStr;'?
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In the context of debugging logic errors in C++, which of the following is not a typical approach?
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What happens when cin reads a string and encounters whitespace in the input?
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Which of the following is true for cin and the extraction operator '>>' when reading double data types?
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Study Notes
Input and Output
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cinand the Extraction Operator>>reads data into variables of various data types-
char: Reads a single character, skipping leading whitespaces -
int&double: Reads digits and signs, stopping at whitespace or non-digit characters
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getline(cin, strVar)reads the entire line of input, including whitespaces and stops at the newline character (\n) -
cin.ignore()discards the next character from the input stream- Can be used with arguments:
.ignore(intExp, chExp)where:-
intExp: Number of characters to ignore -
chExp: Character to stop ignoring at
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- Can be used with arguments:
String Input
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cin >> strVar: Exctracts characters until finding a whitespace- Ignores initial whitespaces and only stores the characters leading up to the first whitespace
- For input lines containing multiple words or phrases,
cin >> strVarwill only store the first word. -
getline(cin, strVar): Reads the entire line of input, including whitespaces- Useful for capturing lines that contain spaces
Formatting Output
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coutis used to output data to the console -
cout <<: The insertion operator sends data to the console-
<<"can be used multiple times in a singlecoutstatement to output different data
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- Manipulators are used to format output:
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endl: Inserts a newline character (\n)
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setw(int): Sets the field width of the next value output- Sets minimum width for the next value to print
- Pads with spaces if the value is shorter than the specified field width
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setprecision(int): Sets the precision of floating-point numbers- Specifies the number of digits to display after the decimal point
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fixedmanipulator can be used to force the use of fixed-point notation
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setfill(char): Sets the fill character to be used for padding in output- Sets a character to be used to fill the remaining space in field width
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left: Left-aligns the output -
right: Right-aligns the output -
showpos: Shows the sign of positive numbers -
noshowpos: Hides the sign of positive numbers -
showpoint: Shows the decimal point for all floating-point numbers -
noshowpoint: Hides the decimal point for all floating-point numbers
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Description
Test your knowledge on input operations in C++ with this quiz. Explore topics such as reading different data types, using getline, and managing input streams. Challenge yourself and enhance your understanding of how input works in C++ programming.
