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oyljerry 2005-07-17
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ltoa
foochow 2005-07-17
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如果在C++中用标准库sstream,这个更安全,C中用一楼说的
Betteronly 2005-07-17
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OK,谢谢！
CoreWar 2005-07-17
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ltoa
<stdlib.h>
char * ltoa ( long value, char * buffer, int radix );
Convert long integer value to string.
Converts a long integer value to a null-terminated string using the specified radix and stores the result in the given buffer.
If radix is 10 and value is negative the string is preceded by the minus sign (-). With any other radix, value is always considered unsigned.
buffer should be large enough to contain any possible value: (sizeof(long)*8+1) for radix=2.
Parameters.
value
Value to be represented as a string.
buffer
Buffer where to store the resulting string.
radix
Numeral radix in which value has to be represented, between 2 and 36.
Return Value.
A pointer to the string.
Portability.
Not defined in ANSI-C. Supported by some compilers.
Example.
/* ltoa example */
#include <stdio.h>
#include <stdlib.h>
int main ()
{
int i;
char buffer [sizeof(long)*8+1];
printf ("Enter a number: ");
scanf ("%d",&i);
ltoa (i,buffer,10);
printf ("decimal: %s\n",buffer);
ltoa (i,buffer,16);
printf ("hexadecimal: %s\n",buffer);
ltoa (i,buffer,2);
printf ("binary: %s\n",buffer);
return 0;
}
Output:
Enter a number: 16021977
decimal: 16021977
hexadecimal: f479d9
binary: 111101000111100111011001
See also.
atof, atol, ecvt, fcvt, gcvt, itoa, strtod
<stdlib.h>
char * ltoa ( long value, char * buffer, int radix );
Convert long integer value to string.
Converts a long integer value to a null-terminated string using the specified radix and stores the result in the given buffer.
If radix is 10 and value is negative the string is preceded by the minus sign (-). With any other radix, value is always considered unsigned.
buffer should be large enough to contain any possible value: (sizeof(long)*8+1) for radix=2.
Parameters.
value
Value to be represented as a string.
buffer
Buffer where to store the resulting string.
radix
Numeral radix in which value has to be represented, between 2 and 36.
Return Value.
A pointer to the string.
Portability.
Not defined in ANSI-C. Supported by some compilers.
Example.
/* ltoa example */
#include <stdio.h>
#include <stdlib.h>
int main ()
{
int i;
char buffer [sizeof(long)*8+1];
printf ("Enter a number: ");
scanf ("%d",&i);
ltoa (i,buffer,10);
printf ("decimal: %s\n",buffer);
ltoa (i,buffer,16);
printf ("hexadecimal: %s\n",buffer);
ltoa (i,buffer,2);
printf ("binary: %s\n",buffer);
return 0;
}
Output:
Enter a number: 16021977
decimal: 16021977
hexadecimal: f479d9
binary: 111101000111100111011001
See also.
atof, atol, ecvt, fcvt, gcvt, itoa, strtod
