Change bit of hex number with leading zeros in C++,(C)

Question

I have this number in hex string:

002A05.

I need to set 7-th bit of this number to 1, so after conversion I will get

022A05
         


        

Answer 1

You asked about strtol specifically, so to answer your question, just add padding after you convert the number with strtol:

const char *s = "002A05";
int x = strtol(s, NULL, 16);
x |= (1<<17);
printf("%.6X\n",x);