Signed hex conversion

[james123]

I need to be able to convert hex values to a signed integer. I'm currently using the below:

strtol(data, NULL, 16);

but when data is equal to something like 'FFFFFE' the result comes out to be massively positive instead of small and negative. Can anyone tell me how I can retrieve the negative result?

Thanks,
James

[laserlight]

This sounds like Convert string to signed hex.

[Babkockdood]

What I did is set a variable to a hex value, then use the variable as an integer. Like so.

#include <stdio.h>

int main()
{
	int hex;
	printf("Hex: ");
	scanf("%x", &hex);
        printf("Decimal: %d\n", hex);
	return 0;
}

I input "FF" and it returned "255" (which is correct). Is this what you're trying to do?