How to convert byte array (containing hex values) to decimal

Question

I am writing some code for an Atmel micro-controller. I am getting some data via Uart, and I store these hex values into an array.

Suppose the elements of the array are:

Answer 1

If data is declared as stated in the comments (char data[]={0x1F, 0x29, 0x3C}), you can run this program.

#include 
#include 
int main()
{
    char receivedByte[9], *p;
    char data[] = { 0x1F, 0x29, 0x3C };
    sprintf(receivedByte, "0x%X%X%X", data[0], data[1], data[2]);
    int intNumber = strtol(receivedByte, &p, 16);
    printf("The received number is: %ld.\n", intNumber);
    return 0;
}