Question

Write a code in C or C++ programming language that generates the hexadecimal values in Table 6-2 in the same format.

Table 6-2 Hexadecimal text file specifying the contents of a 4 × 4 multiplier ROM.

00:	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00	00
10:	00	01	02	03	04	05	06	07	08	09	0A	0B	0C	0D	0E	0F
20:	00	02	04	06	08	0A	0C	0E	10	12	14	16	18	1A	1C	1E
30:	00	03	06	09	0C	0F	12	15	18	1B	1E	21	24	27	2A	2D
40:	00	04	08	0C	10	14	18	1C	20	24	28	2C	30	34	38	3C
50:	00	05	0A	0F	14	19	1E	23	28	2D	32	37	3C	41	46	4B
60:	00	06	0C	12	18	1E	24	2A	30	36	3C	42	48	4E	54	5A
70:	00	07	0E	15	1C	23	2A	31	38	3F	46	4D	54	5B	62	69
80:	00	08	10	18	20	28	30	38	40	48	50	58	60	68	70	78
90:	00	09	12	1B	24	2D	36	3F	48	51	5A	63	6C	75	7E	87
A0:	00	0A	14	1E	28	32	3C	46	50	5A	64	6E	78	82	8C	96
B0:	00	0B	16	21	2C	37	42	4D	58	63	6E	79	84	8F	9A	A5
C0:	00	0C	18	24	30	3C	48	54	60	6C	78	84	90	9C	A8	B4
D0:	00	0D	1A	27	34	41	4E	5B	68	75	82	8F	9C	A9	B6	C3
E0:	00	0E	1C	2A	38	46	54	62	70	7E	8C	9A	A8	B6	C4	D2
F0:	00	0F	1E	2D	3C	4B	5A	69	78	87	96	A5	B4	C3	D2	E1

Answer 1

Here is your required code in C:
#include <stdio.h>

//converts decimal into hexadecimal
void hexa(long x)
{
char result[1000];
long size = 0;
while(x!=0)
{
// temporary variable to store remainder
int temp = 0;
  
// storing remainder in temp variable.
temp = x % 16;
  
// result is digit
if(temp < 10)
{
result[size++] = temp + 48;
}
// result is an alphabet
else
{
result[size++] = temp + 55;
}
  
x = x/16;
}
  
//reversing the result
for(int start=0, end=size-1; start < end; start++, end--)
{
int temp = result[start];
result[start] = result[end];
result[end] = temp;
}
  
result[size] = '\0';
if(size==0)
printf("00");
else if(size==1)
printf("0%s", result);
else
printf("%s", result);
}

//driver code
int main()
{
//variables
double i, j;
  
//printing reqquired table
for(i=0;i<16;i++)
{
hexa(16*i);
printf(": ");
for(j=0;j<16;j++)
{
hexa(i*j);
printf(" ");
}
printf("\n");
}
  
return 0;
}

Please refer to the screenshot of the code to understand the indentation of the code:

Here is the Output for the sample Test Cases: