Int to Char

[Sonicadvance1]

I'm trying to change a int to char as the title suggests.I'v been getting on fine up untill now but I can't seem to get a function to work that changes an int to char.Think anyone can help me out with this?

[ChaosKnight]

You can be lazy and do this:

Code: Select all

int i = 0;
char a = (char)i;

Otherwise you will need to bit-shift to get differant values out. A char is 1/4 of an int so an int can contain up to 4 chars in a row. So you could be super duper lazy and get those out like this:

Code: Select all

int i = 65535;
char *MyChars = (char *)i;
char a = MyChars[0];
char b = MyChars[1];
char c = MyChars[2];
char d = MyChars[3];

[Fanjita]

The line

char *MyChars = (char *)i;

in the second example should read

char *MyChars = (char*)&i;

or you'll get a crash :)

[Sonicadvance1]

Should have named this topic "Int to String",woops :P

[Fanjita]

This will work if you want the output in hex:

void numtohex8(char *dst, int n)
{
int i;
static char hex[]="0123456789ABCDEF";
for (i=0; i<8; i++)
{
dst=hex[(n>>((7-i)*4))&15];
}
}


Credit for this goes to Abu - it was in his hello world code. You can easily adapt it if you want a shorter output.

Remember to null-terminate the string afterwards : *dst[8] = '\0';

[ChaosKnight]

The line

char *MyChars = (char *)i;

in the second example should read

char *MyChars = (char*)&i;

or you'll get a crash :)

Nice catch. That's my second time today...

[raf]

This will work if you want the output in hex:

void numtohex8(char *dst, int n)
{
int i;
static char hex[]="0123456789ABCDEF";
for (i=0; i<8; i++)
{
dst=hex[(n>>((7-i)*4))&15];
}
}


Credit for this goes to Abu - it was in his hello world code. You can easily adapt it if you want a shorter output.

Remember to null-terminate the string afterwards : *dst[8] = '\0';

If you're linking against newlib, you could also use sprintf....

sprintf(dest_string, "%d", source_int); //For decimal output (also try itoa())

or

sprintf(dest_string, "%x", source_int); // For hex output

Raf.

[mrbrown]

Er, although this is a software development forum, it is not a forum on discussing the fundamentals of C. If there's a compiler-specific issue then that can be discussed, but please redirect budding programmers to a more appropriate website.

Locked.