| Revision as of 07:47, 29 May 2009 edit116.74.105.130 (talk) →Standards conformance← Previous edit |
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#REDIRECT ] |
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{{Unreferenced|date=January 2009}} |
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{{lowercase|title=atoi}} |
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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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{{Redirect category shell|1= |
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:<code>int '''atoi'''(const char *str) </code> |
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{{R with history}} |
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{{R to section}} |
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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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}} |
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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>float</code>, or <code>long</code> <code>long</code> type, respectively: |
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:<code>long '''atol'''(const char *str)</code> |
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:<code>double '''atof'''(const char *str)</code> |
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:<code>long long '''atoll'''(const char *str)</code> (]) |
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==Standards conformance== |
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The '''atoi''', '''atof''', and '''atol''' functions are a part of the ISO standard C library (]), while the '''atoll''' function is added by ]. |
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Atoi is character to string converter |
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==See also== |
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* ] |
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* ] |
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* ] |
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* ] |
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] |
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] |
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] |
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] |
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