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53.	What are Keywords?
	Keywords are certain reserved words that have standard and pre-defined meaning in C. These keywords can be used only for their intended purpose.
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54.	What is pointer in c?
	Pointer is a variable that stores/points the address of another variable. Normal variable stores the value of the variable whereas pointer variable stores the address of the variable. syntax: data_type * var_name; Where, * is used to denote that "p" is pointer variable and not a normal variable.
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55.	What is the difference between while and do while loops in C?
	While loop is executed only when given condition is true. Whereas, do while loop is executed for first time irrespective of the condition. After executing while loop for first time, then condition is checked.
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56.	Which functions in C can be used to append a string to another string?
	The strcat function. It takes two parameters, the source string and the string value to be appended to the source string.
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