Thread: string to actual hex value conversion

I'm pretty new to programming c and trying to get from ascii 0x39, 0x39 (99) to the actual hex value 0x63. I've searched many fora but couldn't find a good solution yet. For as far as I know there is no standard function to do this? I can get it to the string 0x36, 0x33 or to an integer, but the actual value 0x63 I don't know how to get. Hope you guys can point me in the right direction

I have been trying this:

Code:

ascii f[2] = {0x39,0x39}; //0x39 , 0x39 , 0x39 , 0x39 , 0x2D , 0x31 , 0x32 , 0x2D , 0x33 , 0x31
char y[2];
int o;

int hj = atoi(&f[0]);
int jj = atoi(&f[1]);

o=jj+10*hj;

sprintf(y,"%x", o);

I guess I should write a conversion function, but I don't know yet where to start..

You probably want to use sscanf to convert your hex string into a numerical value. Once a number you can then print it out in decimal/hex/oct with a printf call.

I have a string with numbers which I have to convert to the hex value because the other side expects this value.
I got this which works now does this seem a good solution?

Code:

ascii f[2] = {0x39,0x39};
char gh[1];
int hj = atoi(&f[0]);

    for(i = 0; i < 100; i++){
        if(hj==i){
            gh[0] = (char)i;
            break;
        }
    }