Question

I have a array of 4 chars and i need his ascii value in a single number.
For example in the array is "joh0". The result should be in hex 0x6a726f00 or in int 111617776.
I use it in the function ntohl(int x).

Answer 1

From your description, it sounds like what you want this (possibly with the indices swapped):

char str[] = "joh0";

uint32_t val = (uint32_t)str[0]
             | (uint32_t)str[1] << 8
             | (uint32_t)str[2] << 16
             | (uint32_t)str[3] << 24;

But I don’t know where you’re getting 106111104048 from.