CODEWITHSUNDEEP
cmicrocontroller
User
User

Reputation: 637

Addition of two ASCII values in c programming

I am receiving a hex value 

uint8_t length = rx_dataframe.dlc// Current value of this in hex is 0x08

I am trying to get a char value("8") from this value. As per the ASCII table hex value of "8" is 0x38. I have tried directly adding "0" but being confused in this

tx_buff_dlc[0]= (rx_dataframe.dlc)+"0";// I know its not currect but just thought

tx_buff_dlc[0]=0x08+0x30 will be equal to 0x038 and will get "8"

Can someone please explain how are the addition for the hex value done in C

Upvotes: 0

Views: 644

Answers (1)

Drew McGowen
Drew McGowen

Reputation: 11706

"0" denotes a string, which has a particular address. The addition will give you some random location in memory, which is not what you want.

Instead, use single quotes: '0'. This will compile to whatever the value is for the character '0' (for ASCII, it's 0x30 as you mentioned). Then, the addition will work as intended.

Upvotes: 9

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