How to use the itoa function in Linux
This article will explain in detail how to use the itoa function in Linux. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.
Linux requires the itoa function, so I'll provide a cross-platform itoa function.
/ / return the length of result string. Support only 10 radix for easy use and better performance
Int my_itoa (int val, char* buf)
{
Const int radix = 10
Char* p
Int a; / / every digit
Int len
Char* b; / / start of the digit char
Char temp
P = buf
If (val
< 0) { *p++ = '-'; val = 0 - val; } b = p; do { a = val % radix; val /= radix; *p++ = a + '0'; } while (val >0)
Len = (int) (p-buf)
* pmure-= 0
/ / swap
Do
{
Temp = * p
* p = * b
* b = temp
-- p
+ + b
} while (b)
< p); return len; } 这个函数会返回字符串的长度，在某些场合下会很有用。 我测试了一下，这个函数大概比MFC自带的itoa要快20%左右。 (因为不需要在循环体内判断if (a >9), so faster).
Improved version of 2010-1-8:
/ / return the length of result string. Support only 10 radix for easy use and better performance
Int my_itoa (int val, char* buf)
{
Const unsigned int radix = 10
Char* p
Unsigned int a; / / every digit
Int len
Char* b; / / start of the digit char
Char temp
Unsigned int u
P = buf
If (val
< 0) { *p++ = '-'; val = 0 - val; } u = (unsigned int)val; b = p; do { a = u % radix; u /= radix; *p++ = a + '0'; } while (u >0)
Len = (int) (p-buf)
* pmure-= 0
/ / swap
Do
{
Temp = * p
* p = * b
* b = temp
-- p
+ + b
} while (b < p)
Return len
}
Improvement: changed the division operation from signed integers to unsigned integers. The typical speed has increased from about 240 milliseconds to about 180 milliseconds. For comparison, the itoa that comes with MFC takes about 320ms.
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