#include<stdio.h>
#include<string.h>
#include<math.h>
void hexadecimal(int a)
{
    int  i=0,count=0,arr[1000];
    while(a!=0)
    {
        arr[i]=a%16;
        count+=1;
        a=a/16;
        if(arr[i]<10)
        {
            arr[i]=48+arr[i];
        }
        else if(arr[i]>=10)
        {
            arr[i]=55+arr[i];
        }
        i++;

    }
    for(i=count-1; i>=0; i--)
    {
        printf("%c",arr[i]);
    }

}
void decimal_binary(int c)
{

    int count=0,i=0,arr[1000];
    while(c!=0)
    {
        arr[i]=c%2;
        count+=1;
        c=c/2;
        i++;
    }
    for(i=count-1; i>=0; i--)
    {
        printf("%d",arr[i]);

    }

}
void decimal_octal(int c)
{
    int count=0,i=0,arr[1000];
    while(c!=0)
    {
        arr[i]=c%8;
        count+=1;
        c=c/8;
        i++;
    }
    for(i=count-1; i>=0; i--)
    {
        printf("%d",arr[i]);

    }

}
int hexadecimal_decimal(char hex[100])
{
    int i = 0, val,decimal,len;
    decimal = 0;
    len = strlen(hex);
    len--;
    for(i=0; hex[i]!='\0'; i++)
    {
        if(hex[i]>='0' && hex[i]<='9')
        {
            val = hex[i] - 48;
        }
        else if(hex[i]>='a' && hex[i]<='f')
        {
            val = hex[i] - 97 + 10;
        }
        else if(hex[i]>='A' && hex[i]<='F')
        {
            val = hex[i] - 65 + 10;
        }

        decimal += val * pow(16, len);
        len--;

    }
    return decimal;

}
int  octaldecimal(int c)
{
    int temp=0,i=0,mod;
    while(c!=0)
    {
        mod=c%10;
        temp=temp+mod*pow(8,i);
        c=c/10;
        i++;
    }
    return temp;
}
int  decimal(int c)
{
    int temp=0,i=0,mod;
    while(c!=0)
    {
        mod=c%10;
        temp=temp+mod*pow(2,i);
        c=c/10;
        i++;
    }
    return temp;
}
int main()
{
    FILE *file;
    char str[50];
    int a,b,c,arr[60],i=0,count=0,k,arr1[50],arr2[30],x;
    file = fopen("text.txt","a");
    printf("Select operator \n");
    printf("1. DIC\n");
    printf("2. BIN\n");
    printf("3. OCT\n");
    printf("4. HEX\n");
    printf("5. CONTINUE\n");
    printf("6. EXIT\n");
    pint:
    scanf("%d",&a);
    point:
    if(a==1)
    {
        printf("DIC ");
        scanf("%d",&c);
        fprintf(file,"DIC %d\n",c);
        k=c;
        printf("BIN ");
        while(c!=0)
        {
            arr[i]=c%2;
            count+=1;
            c=c/2;
            i++;
        }
        fprintf(file,"BIN ");
        for(i=count-1; i>=0; i--)
        {
            printf("%d",arr[i]);
            fprintf(file,"%d",arr[i]);


        }
        c=k;
        printf("\nOCT ");
        i=0,count=0;
        while(c!=0)
        {
            arr1[i]=c%8;
            count+=1;
            c=c/8;
            i++;
        }
        fprintf(file,"\nOCT ");
        for(i=count-1; i>=0; i--)
        {
            printf("%d",arr1[i]);
            fprintf(file,"%d",arr1[i]);

        }
        c=k;
        i=0,count=0;
        printf("\nHEX ");
        while(c!=0)
        {
            arr2[i]=c%16;
            count+=1;
            c=c/16;
            if(arr2[i]<10)
            {
                arr2[i]=48+arr[i];
            }
            else if(arr2[i]>=10)
            {
                arr2[i]=55+arr2[i];
            }
            i++;

        }
        fprintf(file,"\nHEX ");
        for(i=count-1; i>=0; i--)
        {
            printf("%c",arr2[i]);
            fprintf(file,"%c",arr2[i]);
        }


    }
    else if(a==2)
    {
        printf("BIN ");
        scanf("%d",&c);
        fprintf(file,"BIN %d\n",c);
        x=decimal(c);
        k=x;
        printf("DIC %d",x);
        fprintf(file,"DIC %d\n",x);
        while(x!=0)
        {
            arr1[i]=x%8;
            count+=1;
            x=x/8;
            i++;
        }
        fprintf(file,"OCT ");
        printf("\nBIN ");
        for(i=count-1; i>=0; i--)
        {
            printf("%d",arr1[i]);
            fprintf(file,"%d",arr1[i]);

        }


        i=0,count=0;
        printf("\nHEX ");
        x=k;
        while(x!=0)
        {
            arr2[i]=x%16;
            count+=1;
            x=x/16;
            if(arr2[i]<10)
            {
                arr2[i]=48+arr[i];
            }
            else if(arr2[i]>=10)
            {
                arr2[i]=55+arr2[i];
            }
            i++;

        }
        fprintf(file,"\nHEX ");
        for(i=count-1; i>=0; i--)
        {
            printf("%c",arr2[i]);
            fprintf(file,"%c",arr2[i]);
        }

    }
    else if(a==3)
    {
        printf("OCT ");
        scanf("%d",&c);
        fprintf(file,"OCT %d\n",c);
        x=octaldecimal(c);
        k=x;
        printf("DIC %d\n",x);
        fprintf(file,"DIC %d\n",x);
        printf("BIN ");
        while(x!=0)
        {
            arr[i]=x%2;
            count+=1;
            x=x/2;
            i++;
        }
        fprintf(file,"BIN ");
        for(i=count-1; i>=0; i--)
        {
            printf("%d",arr[i]);
            fprintf(file,"%d",arr[i]);


        }
        x=k;
        i=0,count=0;
        printf("\nHEX ");
        while(x!=0)
        {
            arr2[i]=x%16;
            count+=1;
            x=x/16;
            if(arr2[i]<10)
            {
                arr2[i]=48+arr[i];
            }
            else if(arr2[i]>=10)
            {
                arr2[i]=55+arr2[i];
            }
            i++;

        }
        fprintf(file,"\nHEX ");
        for(i=count-1; i>=0; i--)
        {
            printf("%c",arr2[i]);
            fprintf(file,"%c",arr2[i]);
        }
    }
    else if(a==4)
    {
        printf("HEX ");
        scanf("%S",&str);
        fprintf(file,"HEX %s\n",str);

        x=hexadecimal_decimal(str);
        k=x;
        printf("DIC %d\n",x);
        fprintf(file,"DIC %d\n",x);

        printf("BIN ");
        while(x!=0)
        {
            arr[i]=x%2;
            count+=1;
            x=x/2;
            i++;
        }
        fprintf(file,"BIN ");
        for(i=count-1; i>=0; i--)
        {
            printf("%d",arr[i]);
            fprintf(file,"%d",arr[i]);
        }

        x=k;
        i=0,count=0;
        while(x!=0)
        {
            arr1[i]=x%8;
            count+=1;
            x=x/8;
            i++;
        }
        fprintf(file,"\nOCT ");
        printf("\nOCT ");
        for(i=count-1; i>=0; i--)
        {
            printf("%d",arr1[i]);
            fprintf(file,"%d",arr1[i]);

        }
    }
    fprintf(file,"\n");
    scanf("%d",&b);
    if(b==5)
    {
        goto pint;
    }

    fclose(file);

}