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	The '''atoi''' ('''A'''SCII '''to''' '''i'''nteger) function in the ] is used to convert a string into a numerical representation.

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	:<code>int '''atoi'''(const char *str) </code>
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	The <code>str</code> argument is a string, represented by an array of characters, containing the characters of a signed integer number. The string must be null-terminated. When atoi encounters a string with no numerical sequence, it returns zero (0). If the string holds a valid sequence of digits that represents the number 0, it also returns a 0, making it impossible to tell from the return value alone whether the string holds a valid number or not. The newer function ] does not have this deficiency.
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	Variants of the '''atoi''' function, '''atol''', '''atof''', and '''atoll''' (the latter formerly known as '''atoq'''), are used to convert a string into a <code>long</code>, <code>double</code>, or <code>long</code> <code>long</code> type, respectively:

	:<code>long '''atol'''(const char *str)</code>
	:<code>double '''atof'''(const char *str)</code>
	:<code>long long '''atoll'''(const char *str)</code> (])

	==Standards conformance==

	The '''atoi''', '''atof''', and '''atol''' functions are a part of the ISO standard C library (]), while the '''atoll''' function is added by ].

	==References==
	© 1979 by Bell Telephone Laboratories, Incorporated

	==See also==
	* ]
	* ]
	* ]
	* ]
	* ]

	]
	]

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Latest revision as of 14:34, 11 June 2017

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