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1.What is the difference between prefix and postfix mode for the increment and decrement operators? Give...

1.What is the difference between prefix and postfix mode for the increment and decrement operators? Give examples of each.

2.How would you prevent infinite loops in a “while” loop statement? Give an example of an infinite while loop.

3.Give an example of a simple “for” loop.

4.What is a “sentinel” used for?

5.Give an example of the “open” member function to open a file.

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Answer #1

1) prefix increment/decrement changes the value before the expression is evaluated,postfix increment/decrement changes the value after it has to do with the way the post increment operator works,it returns the value of I and then increments the value

Ex pg1 main()

{ into a=5,b;

b=++a +5; printf("a=%d,b=%d",a,b);}

Result a=a+1 a as 6,then b becomes b=6+5=11 so a=6,b=11

Pg2 main()

{ into a=5,b; b=a++ +5;printf ("a=%@d,b=%d",a,b);}

b=5+5=10 a=a+1,makes value of a as 6 so a=6 b=10

2)<HTML> <head> <title> your first PHP while loop!</title ><head><body><?php $loopcond=true;

While($loopcond==true){//echo your message that the loop is running below echo"<p> The loop is running <p>";}$loopcond=false; echo"<p> and now its done /p>";>? </body>. </HTML> since to exit the loop you will need to make the condition in the while loop evaluate to false,you will have to set $loopcond to false and the variable assignment should be done inside the while loop,

While($loopcond==true){//echo msg

Echo "<p> the loop is running <p>"; $loopcond=false;

3)for loop syntax for(initialization; condition test;increment or decrement)

{//code}

Int I; for (i"=1; i <=3; i ++)

{ printf ("hello,world")}

4)A senitel node is a specifically designated node used with linked lists and trees as a traversal path terminator,this type of node doesx not hold or reference any data managed by the data structure

Ex: strict sll_node {// int key; study all_node *next; ,}

Sll, *first;

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