Class 10 Computer Chapter 2 Notes

Complete Class 10 Computer Chapter 2 Notes User Interaction in 10th Class Computer Science English and Urdu Medium. These computerized notes are very helpful in the preparation of Class 10 Computer Chapter 2 Notes for students of the 10th class Computer Science and these are according to the paper patterns of all Punjab boards.

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• Important Multiple Choice Questions ( MCQs ) with correct Answers of Chapter No. 2: User Interaction in Computer Science class 10th Urdu Medium.
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• getch(): getch() function is used to read a character from user. The character entered by user does not get displayed on screen. 
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• This function is generally used to hold the execution of program because the program does not continue further until the user types a key. To use this function, we need to include the library conio.h in the header section of program.
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• EXAMPLE CODE: #include ,  #include  ,   void main ()  ,  {    printf("Enter any key if you want to exit program");   ,  getch();   }
• In the above, program prompts user to enter a character and then waits for the user's input before finishing the execution of program.
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• EXAMPLE CODE:  #include  ,  #include   ,  void main ()  ,  {   char key;   printf("Enter any key: ");   ,    key = getch(); //Gets a character from user into variable key     }
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• If we run this program, we notice a difference between reading a character using scanf and reading a character using getch functions. When we read character through scanf, it requires us to press enter for further execution.
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•  But in case of getch, it does not wait for enter key to be pressed. Function reads a character and proceeds to the execution of next line.
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• Statement Terminator: A statement terminator is identifier for compiler which identifies end of a line. In C language semi colon (;) is used as statement terminator. If we do not end each statement with a; it results into error.
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• Escape Sequence:  Purpose: Escape sequences are used in printf function inside the " and ". They force printf to change its normal behavior of showing output. Let's understand the concept of an escape sequence by looking at the following example statement:  printf("My name is \"Ali\"");  , The output of above statement is,  My name is "Ali"  ,  In the above example \" is an escape sequence. It causes printf to display " on computer screen.
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• Formation of escape sequence: Escape sequences consist of two characters. The first character is always back slash () and the second character varies according to the functionality that we want to achieve. Back slash (\) is called escape character which is associated with each escape sequence to notify about escape. 
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• Escape character and character next to it are not displayed on screen, but they perform specific task assigned to them.
• New Line (\n): After escape character, in specifies movement of the cursor to start of the next line. This escape sequence is used to print the output on multiple lines. Consider the following example to further understand this escape sequence:
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• EXAMPLE CODE: #include   ,   void main()   ,  {   printf("My name is Ali. \n");   , printf("I live in Lahore.");    }  , Output  ,   My name is Ali.   I live in Lahore.
• Important Note: In the absence of an escape sequence, even if we have multiple printf statements, their output is displayed on a single line. Following example illustrates this point.  
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• EXAMPLE CODE:  #include  , void main()  ,  {     printf("My name is");  ,   printf("Ahmad");     }   ,  Output,   My name is Ahmad
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• Tab (\t): Escape sequence \t specifies the I/O function of moving to the next tab stop horizontally. A tab stop is collection of 8 spaces. Using \t takes cursor to the next tab stop. This escape sequence is used when user presents data with more spaces.
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• Operators: The name computer suggests that computation is the most important aspect of computers. We need to perform computations on data through programming. We have a lot of mathematical functions to perform calculations on data. We can also perform mathematical operations in our programs. C language offers numerous operators to manipulate and process data. Following is the list of some basic operator types:
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• Assignment operator,   Arithmetic operators,   Logical operators,   Relational operators