convert hex data string to decimal

[archana.c07]

the hex value 00 00 00 00 00 BC 61 4E (LSB)

which is stored in string as

char data[8] = {0x4E, 0x61, 0xBC, 0x00,
0x00, 0x00, 0x00, 0x00};

now i want to convert it into int
(equivalent of above hex string is 12345678)

i have below code

char a = 0x00;
char b = 0x00;
char c = 0x00;
char d = 0x00;
char e = 0x00;
char f = 0xbc;
char g = 0x61;
char h = 0x4e;

long long int combination = (a << 56) |(b << 48) | (c << 40) | (d << 32) |
(e << 24) | (f << 16) | (g << 8) | (h);

cout << combination << endl << endl;

but i'm getting undefined result

help me..!!!

[mrnutty]

Try doing this :

int64 bigEndian(short* hex, int size){	
	if(size > 18 || size < 1) return -1; //int64 cannot hold anymore
	int64 res = int64();
	for(int i = 0; i != size-1; ++i){
             //OR and SHIFT as we go
		res |= hex[i]; 
		res <<= 8;
	}
        //Just OR the last value since it does not need to be shifted, thats why our loop went from i = 0 to size-1.
	res |= hex[size-1];
	return res;
}
int main(){
	short hexValues[8] = {0x00,0x00,0x00,0x00,0x00,0xBC,0x61,0x4E};
	cout  << bigEndian(hexValues,8) << endl;
}