utoa() — Convert unsigned int into a string
Standards
Standards / Extensions | C or C++ | Dependencies |
---|---|---|
z/OS® UNIX | both | z/OS V1R5 |
Format
#define _OPEN_SYS_ITOA_EXT
#include <stdlib.h>
char * utoa(unsigned int n, char * buffer, int radix);
General description
The utoa() function coverts the unsigned integer n into a character
string. The string is placed in the buffer passed, which must be
large enough to hold the output. The radix values can be OCTAL, DECIMAL,
or HEX. When the radix is DECIMAL, utoa() produces the same result
as the following statement:
(void) sprintf(buffer, "%u", n);
with
buffer the returned character string. When the radix is OCTAL, utoa()
formats unsigned integer n into an octal constant. When the radix
is HEX, utoa() formats unsigned integer n into a hexadecimal constant.
The hexadecimal value will include lower case abcdef, as necessary.Returned value
String pointer (same as buffer) will be returned. When passed an invalid radix argument, function will return NULL and set errno to EINVAL.
Portability considerations
This is a non-standard function. Even though the prototype given is commonly used by compilers on other platforms, there is no guarantee that this function will behave the same on all platforms, in all cases. You can use this function to help port applications from other platforms, but you should avoid using it when writing new applications, in order to ensure maximum portability.
Example
CELEBU10
/* CELEBU10
This example reads an unsigned int and formats it to decimal,
octal, hexadecimal constants converted to a character string.
*/
#define _OPEN_SYS_ITOA_EXT
#include <stdio.h>
#include <stdlib.h>
int main ()
{
unsigned int i;
char buffer [sizeof(unsigned int)*8+1];
printf ("Enter a number: ");
if (scanf ("%u",&i) == 1) {
utoa (i,buffer,DECIMAL);
printf ("decimal: %s\n",buffer);
utoa (i,buffer,HEX);
printf ("hexadecimal: %s\n",buffer);
utoa (i,buffer,OCTAL);
printf ("octal: %s\n",buffer);
}
return 0;
}
Output
If the input is 1234, then the output should be:
decimal: 1234
hexadecimal: 4d2
octal: 2322