Question

Write a program in C that reads prompts the user for a positive integer and then prints out that number in base 16, base 8 and base 2.

Answer 1

Implement te program as follows:

1. declare integer variable num to store a number
2. declare array to store binary number
3. declare counter for binary array
4. ask the user to enter an integer
5. read integer from user
6. print base 10 number using %d format command
7. print base 8 number using %o format command
8. print base 16 number using %x format command
9. repeat until num<0
10. storing remainder in binary array
11. divide num by 2
12. increment i by 1
13. print binary array in reverse order

Program:

#include <stdio.h>

int main()
{
    int num;                                /* declare integer variable num to store a number */
    int binaryNum[32];                      /* array to store binary number */
    int i = 0;                              /* counter for binary array */
    
    printf("Enter a positive integer: ");   /* ask the user to enter an integer */
    scanf("%d", &num);                      /* read integer from user */
    
    printf("\nBase 10 number : %d ", num);  /* print base 10 number using %d format command */
    printf("\nBase 8 number : %o", num);    /* print base 8 number using %o format command */
    printf("\nBase 16 number : %x", num);   /* print base 16 number using %x format command */
    
    /* convert num to binary */
    while (num > 0) {                       /* repeat until num<0 */
        binaryNum[i] = num % 2;             /* storing remainder in binary array */
        num = num / 2;                      /* divide num by 2 */
        i++;                                /* increment i by 1 */
    } 
  
    printf("\nBase 2 number : "); 
    for (int j = i - 1; j >= 0; j--)        // printing binary array in reverse order
        printf("%d",binaryNum[j]);

    return 0;
}

Screenshot:

Output:

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