Question

PLEASE NOTE:1)-DO NOT USE FUNCTIONS USE ONLY DO WHILE LOOP.

                         2)DO NOT USE IN-BUILT FUNCTIONS.

                         3)Use of string and char is not allowed.            

Write a program in c laungage that prints a table of the binary, octal and hexadecimal equivalents of the decimal numbers in the range1 through 256.

Answer 1

Here is the code that will print table of number, binary equivalent of number, octal equivalent of number and hexa decimal equivalent of number using a do while loop:

/**********************************************************
 Program to convert a decimal number to binary, 
 octal and hexadecimal using recursion for numbers 1-256
 **********************************************************/

#include<stdio.h> // include stdio.h library
 //Method declaration
void convertToBaseX(int, int);

//main method
int main(void) {
  //Number variable to keep 1st number
  int num = 1;
  //Printing table header
  printf("number\t\t\tBinary\t\tOctal\t\tHexadecimal\n");
  //Do while loop
  do {
    //print number in first column
    printf("%d", num);
    printf("\t\t\t");
    //calculate binary and print the result for table
    convertToBaseX(num, 2);
    if (num > 7 && num <= 127) {
      printf("\t\t");
    } else if (num > 127) {
      printf("\t");
    } else {
      printf("\t\t");

    }

    //calculate octal and print the result for table
    convertToBaseX(num, 8);
    if (num > 7 && num <= 127) {
      printf("\t\t\t");
    } else if (num > 127) {
      printf("\t\t\t");
    } else {
      printf("\t\t\t");

    }
    //calculate hexadecimal and print the result for table
    convertToBaseX(num, 16);
    //new line for next row
    printf("\n");
    //increment the number
    num++;
  } while (num <= 256); //while loop will run till number is 256    

  return 0; // return 0 to operating system
}
/**
 * Method to print in requried base
 * @param num: number to convert
 * @param base: base in which number is requried to be converted
 */
void convertToBaseX(int num, int base) {
  //remainder handling variable
  int rem;

  //if number is zero then no conversion
  if (num == 0) {
    return;
  }
  //other wise convert the number to requried base
  else {
    //divide number by base and get the remainder
    //to find rightmost digit
    rem = num % base;

    convertToBaseX(num / base, base); // recursive call        
    //handle base 16
    if (base == 16 && rem >= 10) {

      printf("%c", rem + 55);
    } else {
      printf("%d", rem);
    }
  }
}

Output:

Screen shot of output table (Output is very large so broken into different images):