2017 SW Practical SET 1 Q1

#define MAX_BUFFER_CAP 1024
#include <string.h>
#include <stdio.h>

void decToBin(int);
void decToOct(int);
void decToHex(int);

int main(void)
{
    int num, choice;char ch;
    clrscr();
    do
    {
        ch = 'N';
        printf("\nEnter a number in base 10: ");
        scanf("%d", &num);
        printf("Which base do you want to convert it to?\n");
        printf("Press 1 for Binary\n");
        printf("Press 2 for Octal\n");
        printf("Press 3 for Hexadecimal\n\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch(choice)
        {
            case 1: printf("%d in binary is ", num);
                decToBin(num);
                break;
            case 2: printf("%d in octal is ", num);
                decToOct(num);
                break;
            case 3: printf("%d in hexadecimal is ", num);
                decToHex(num);
                break;
            default:printf("You entered a wrong choice! Please try again!");
                ch = 'Y';

        }
        if(ch == 'N')
        {
            printf("\n\nDo you want to continue (Y/N)? ");
            ch = getche();
        }

    }
    while(toupper(ch) == 'Y');
    getch();
    return 0;
}

void decToBin(int num)
{
    char bin[MAX_BUFFER_CAP];
    char temp[MAX_BUFFER_CAP] = "";
    while(num > 0)
    {
        sprintf(bin, "%d%s", num%2, temp);
        strcpy(temp, bin);
        num /= 2;
    }
    printf("%s", bin);
}

void decToOct(int num)
{
    char oct[MAX_BUFFER_CAP];
    char temp[MAX_BUFFER_CAP] = "";
    while(num > 0)
    {
        sprintf(oct, "%d%s", num%8, temp);
        strcpy(temp, oct);
        num /= 8;
    }
    printf("%s", oct);
}

void decToHex(int num)
{
    char hex[MAX_BUFFER_CAP];
    char temp[MAX_BUFFER_CAP] = "";
    while(num > 0)
    {
        int dig = num%16;
        char ch;
        if(dig < 10)
        {
            ch = '0'+ dig;
        }
        else
        {
            ch = 'A' + (dig - 10);
        }
        sprintf(hex, "%c%s", ch, temp);
        strcpy(temp, hex);
        num /= 16;
    }
    printf("%s", hex);
}