Convert char to hex 1

[FoxProProgrammer]

I have an array that contains a char that represents a hex number. The array might look like the following:

stimByte[0][0] = "13"
stimByte[0][1] = "FB"
stimByte[1][0] = "FC"
stimByte[1][1] = "53"

The hex data is:
0x13FB
0xFC53

I need to convert the char array to hex data.

I tried the following:

val[n] = stimByte[n][0] << 8;
val[n] += stimByte[n][1];

Here's what happens when n = 0.

val[0] = stimByte[0][0] << 8 = 1300 (so far so good)
val[0] +- stimByte[0][1] = 12FB

I don't understand why it calculates 12FB. I get 13FB when I add the numbers manually. Any suggestions?

Thanks!


dz

 

[FoxProProgrammer]

Need to correct a typo.

val[0] += stimByte[0][1] = 12FB


dz

 

[FoxProProgrammer]

I solved my problem but still don't understand it.

stimByte[n][1] has a value of FFFFFFFB instead of 000000FB. When it is added to 00001300, the result is 12FB. I don't understand why the compiler represents FB as FFFFFFFB, but I masked the upper bits with 000000FF. I'll keep researching this. Sorry for the wasted posts.

dz

 

[xwb]

Use unsigned int instead of int. int causes sign extension.

 

[FoxProProgrammer]

Thank you, xwb. That was the problem.

dz