如何在C中以十六进制，十进制和八进制形式打印常量

Question

I'm having some issues resolving one of my assignments.I have searched documentation on the web but I cannot find a concise answer.

I have to print a constant eg123456789 in hexadecimal,decimal and octal form.

I know that 0x is for hexadecimal,0 for decimal and nothing for octal.Yet I have no ideea how to print it.I have used the #define method to define my constant

    #include <stdio.h>
#include <stdlib.h>
#define CONST 123456789
int main()
{
 printf("%d",0xCONST);
    return 0;
}

Can someone help?

Answer 1

Read up on the printf format specifiers on the printf man page .

Code:

#include <stdio.h>

#define CONST 123456789

int main()
{
    printf("%d = %#x = %#o\n", CONST, CONST, CONST);
    return 0;
}

Compile and test:

$ gcc -Wall dec-hex-oct.c && ./a.out 
123456789 = 0x75bcd15 = 0726746425
$