octal_to_hexadecimal.c File Reference

Octal to hexadecimal conversion by scanning user input. More...

#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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Functions
long	octalToDecimal (long octalValue)
	Convert octal number to decimal number. More...
char *	octalToHexadecimal (long octalValue)
	Convert octal number to hexadecimal number dynamically allocated memory needs to be freed by the calling the function free. More...
static void	test ()
	Test function. More...
int	main ()
	Main function. More...

Detailed Description

Octal to hexadecimal conversion by scanning user input.

The octalToHexadecimal function take the octal number as long return a string hexadecimal value after conversion

Author

Rachit Bhalla

Function Documentation

main()

int main

(

void

)

Main function.

Returns

0 on exit

{
    // execute the tests
    test();
 
    // get the value of octal number as input
    int octalValue;
    printf("Enter an octal number: ");
    scanf("%d", &octalValue);
 
    // call the function octalToHexadecimal and print the hexadecimal value
    char *hexadecimalValue = octalToHexadecimal(octalValue);
    printf("Equivalent hexadecimal number is: %s", hexadecimalValue);
 
    // free the memory allocated dynamically in function octalToHexadecimal
    free(hexadecimalValue);
 
    // return 0 and exit
    return 0;
}

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octalToDecimal()

long octalToDecimal

(

long

octalValue

)

Convert octal number to decimal number.

Parameters

octalValue

is the octal number that needs to be converted

Returns

a decimal number after conversion

                                    {
    long decimalValue = 0;
    int i = 0;
    while (octalValue) {
        // Extracts right-most digit, multiplies it with 8^i, and increment i by 1
        decimalValue += (long)(octalValue % 10) * pow(8, i++);
        // Shift right in base 10
        octalValue /= 10;
    }
    return decimalValue;
}

octalToHexadecimal()

char * octalToHexadecimal

(

long

octalValue

)

Convert octal number to hexadecimal number dynamically allocated memory needs to be freed by the calling the function free.

Parameters

octalValue

is the octal number that needs to be converted

Returns

a hexadecimal value as a string after conversion

                                         {
    char *hexadecimalValue = malloc(256 * sizeof(char));
    sprintf(hexadecimalValue, "%lX", octalToDecimal(octalValue));
    return hexadecimalValue;
}

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test()

static void test ( void  )

static

Test function.

Returns

void

                   {
    /* test that hexadecimal value of octal number 213 is 8B */
    assert(strcmp(octalToHexadecimal(213), "8B") == 0);
 
    /* test that hexadecimal value of octal number 174 is 7C */
    assert(strcmp(octalToHexadecimal(174), "7C") == 0);
}

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