标签:-- else long string int ret tmp str code
#include <stdlib.h>
/*整形转字符型*/
char * itoa(int value, char *string, int radix)
{
char tmp[33];
char *tp = tmp;
int i;
unsigned v;
int sign;
char *sp;
if (radix > 36 || radix <= 1)
{
return 0;
}
sign = (radix == 10 && value < 0);
if (sign)
v = -value;
else
v = (unsigned)value;
while (v || tp == tmp)
{
i = v % radix;
v = v / radix;
if (i < 10)
*tp++ = i + '0';
else
*tp++ = i + 'a' - 10;
}
if (string == 0)
string = (char *)malloc((tp - tmp) + sign + 1);
sp = string;
if (sign)
*sp++ = '-';
while (tp > tmp)
*sp++ = *--tp;
*sp = 0;
return string;
}
/*长整形转字符型*/
char *ltoa(long value, char *string, int radix)
{
char tmp[33];
char *tp = tmp;
long i;
unsigned long v;
int sign;
char *sp;
if (radix > 36 || radix <= 1)
{
return 0;
}
sign = (radix == 10 && value < 0);
if (sign)
v = -value;
else
v = (unsigned long)value;
while (v || tp == tmp)
{
i = v % radix;
v = v / radix;
if (i < 10)
*tp++ = i + '0';
else
*tp++ = i + 'a' - 10;
}
if (string == 0)
string = (char *)malloc((tp - tmp) + sign + 1);
sp = string;
if (sign)
*sp++ = '-';
while (tp > tmp)
*sp++ = *--tp;
*sp = 0;
return string;
}
/*无符号长整形转字符型*/
char *_ultoa(unsigned long value, char *string, int radix)
{
char tmp[33];
char *tp = tmp;
long i;
unsigned long v = value;
char *sp;
if (radix > 36 || radix <= 1)
{
return 0;
}
while (v || tp == tmp)
{
i = v % radix;
v = v / radix;
if (i < 10)
*tp++ = i + '0';
else
*tp++ = i + 'a' - 10;
}
if (string == 0)
string = (char *)malloc((tp - tmp) + 1);
sp = string;
while (tp > tmp)
*sp++ = *--tp;
*sp = 0;
return string;
}
标签:-- else long string int ret tmp str code
原文地址:https://www.cnblogs.com/s3320/p/11959314.html