Class 11: Loops

Question 1

When is break statement valid?

Answer 1

In a loop or switch construct

Question 2

When is continue valid?

Answer 2

Only valid is loop contruct

Question 3

What does break do

Answer 3

Exits innermost loop or switch statement which encloses it regardless of loop conditions

Question 4

Continue what does it do

Answer 4

Causes the loop to stop its current iteration and begin to execute from the top again

Question 5

Go to (jump statement)

Answer 5

Go to identifier; //identifier is called a label here
Identifier: statement;

Question 6

Dangling else

Answer 6

The compiler does not pay attention to formatting, so even if the else is aligned with the first if, the compiler pairs it with the SECOND IF

Question 7

Boolean issues

Answer 7

Int I; if(I) is better represented as if(I != 0)
Float x; if(!x) is better represented as if (x == 0.0)
Char c; if (c) is buffer represented as if(c != ‘\0’);
Int ptr; if (ptr) is better represented as if(*ptr != NULL)

Question 8

How to write an infinite loop

Answer 8

For(;;)
While(1)

Question 9

The common operators

Answer 9

Examples
I = a,b,c; //stores a into I
I = (a,b,c); //stores c into I

For loop
For(n = 1,m=10; n <=m; n++, m—)

WHile(c = getchar(), c != ‘\0’)

Question 10

Enumerated data types

Answer 10

An enumerated data type is designed for variables that contain only a limited set of values

Question 11

EnumContainer_type = {CUP = 8; PINT = 16, Quart = 32, HALF_GALLON = 64, GALLON = 128};
Enum Container_Type milk_bottle;

Answer 11

Otherwise, but default CUP = 0, PINT = 1….

Question 12

Can you do this
Enum{CUP, PINT QUART, HALF_GALLON, GALLON}milk_bottle, gas_can, medicine_bottle;

Answer 12

Yes, if ther is only one declaration of the variables of a particular enumerated type, not Enum data type name, both statement may be combined. However no more variables of this enum data type can be declared later because not enum data type was given to it.

Question 13

Enum month{ Jan = 1;, feb = 2, mar = 3, apr = 4, may = 5, jun = 6, July = 7, aug = 8, sep = 9, oct = 10, nov = 11, dec = 12}this_month;

Answer 13

This_month = feb;