Question

In C programming:

Generalize the to_binary() function of Listing 9.8 (from your textbook) to a to_base_n(number,base) function that takes a second argument in the range 2–10. It then should convert (and print) the number that is its first argument to the number base given by the second argument. For example, tobasen(129,8) would display 201, the base-8 equivalent of 129. Test the function in a complete program.

Answer 1

#include <stdio.h>

#include <string.h>

char reVal(int num)

{

    if (num >= 0 && num <= 9)

        return (char)(num + '0');

    else

        return (char)(num - 10 + 'A');

}

void strev(char *str)

{

    int len = strlen(str);

    int i;

    for (i = 0; i < len / 2; i++)

    {

        char temp = str[i];

        str[i] = str[len - i - 1];

        str[len - i - 1] = temp;

    }

}

char *to_base_n(char res[], int base, int inputNum)

{

    int index = 0;

    while (inputNum > 0)

    {

        res[index++] = reVal(inputNum % base);

        inputNum /= base;

    }

    res[index] = '\0';

    strev(res);

    return res;

}

int main()

{

    int inputNum, base;

    printf("Enter input number: ");

    scanf("%d",&inputNum);

    printf("Enter base: ");

    scanf("%d",&base);

    char res[100];

    printf("Equivalent of %d in base %d is %s\n",inputNum, base, to_base_n(res, base, inputNum));

    return 0;

}

//SAMPLE OUTPUT:

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