char hexval[8] = {0};
int n = 49;
 
sprintf(hexval,"0x%X", n);

char DecimalToHexa(int rem);
void hexaDecimal(int h, char* buffer, int bufferSize);
 
int main()	
{
	char buffer[8] = {0};
	int deci=115;
	hexaDecimal(deci, buffer, sizeof(buffer));
	printf("buffer = '%s'\n", buffer);
	return 0; 
}
 
void hexaDecimal(int h, char * buffer, int bufferSize)
{
    int rem;
    char output[8]= {0};
    char digit = 0;
    int i = 0;
    int j = 0;
    int k = 0;
 
    do
    {    		
        rem = h%16;
        digit = DecimalToHexa(rem);
        h=h/16;
        output[i] = digit;
        ++i;
    } while(h/16!=0);
    if(h > 0)
	{
        rem = h;
        digit=DecimalToHexa(rem);   	
        output[i] = digit;
        ++i;
    }
    if(i >= bufferSize)
    {
        buffer[0] = 0;
    }
    else
    {
        for(j= i-1, k = 0; j >= 0; j--,k++)
        {
            buffer[k] = output[j];
        }
        buffer[i] = 0;
    }
}
 
 
char DecimalToHexa(int rem)
{		
	char c = 0;
	if( rem >= 10)
	{
		c = (rem - 10) + 'A';
	}
	else
		c = rem + '0';
	return c;
}