itoa()

Convert an integer into a string, using a given base

Synopsis:

#include <stdlib.h>

char* itoa( int value, 
            char* buffer, 
            int radix );

Arguments:

value

The value to convert into a string.

buffer

A buffer in which the function stores the string. The size of the buffer must be at least:

8 × sizeof( int ) + 1

bytes when converting values in base 2 (binary).

radix

The base to use when converting the number. This value must be in the range:

2 <= radix <= 36

If the value of radix is 10, and value is negative, then a minus sign is prepended to the result.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The itoa() function converts the integer value into the equivalent string in base radix notation, storing the result in the specified buffer. The function terminates the string with a NUL character.

Returns:

A pointer to the resulting string, or NULL if an error occurs (errno is set).

Errors:

EINVAL: The value of the radix argument is not in the valid range.

Examples:

#include <stdio.h>
#include <stdlib.h>

int main( void )
{
    char buffer[20];
    int base;

    for( base = 2; base <= 16; base += 2 ) {
        printf( "%2d %s\n", base,
            itoa( 12765, buffer, base ) );
    }
    
    return EXIT_SUCCESS;
}

produces the output:

 2 11000111011101
 4 3013131
 6 135033
 8 30735
10 12765
12 7479
14 491b
16 31dd

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes