Final project

#include<stdio.h>
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]);

    }

}
void decimal_hexa(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]);
    }

}
int  bin_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  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 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 main()
{
    struct number
    {
        int a,c;
    };
    FILE *file;
    struct number name;
    char str[1000];
    int x,k,b,arr[1000],count,i,arr1[1000],arr2[1000],h;
    file = fopen("run.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");
    point:
    scanf("%d",&name.a);
    if(name.a==1)
    {
        printf("DIC ");
        scanf("%d",&name.c);
        fprintf(file,"DIC %d\n",name.c);
        k=name.c;
        i=count=0;
        while(name.c!=0)
    {
        arr[i]=name.c%2;
        count+=1;
        name.c=name.c/2;
        i++;
    }
    fprintf(file,"BIN ");
    printf("BIN ");
    for(i=count-1; i>=0; i--)
    {
        printf("%d",arr[i]);
         fprintf(file,"%d",arr[i]);

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

    }
    i=count=0;
     while(h!=0)
    {
        arr2[i]=h%16;
        count+=1;
        h=h/16;
        if(arr2[i]<10)
        {
            arr2[i]=48+arr2[i];
        }
        else if(arr2[i]>=10)
        {
            arr2[i]=55+arr2[i];
        }
        i++;

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

    }

    else if(name.a==2)
    {

        printf("BIN ");
        scanf("%d",&name.c);
        fprintf(file,"\nBIN %d",name.c);
        x=bin_decimal(name.c);
        k=x;
        fprintf(file,"\nDIC %d",x);
        printf("DIC %d",x);
        fprintf(file,"\nOCT ");
        printf("\nOCT ");
        int count=0,i=0,arr[1000];
        while(x!=0)
        {
            arr[i]=x%8;
            count+=1;
            x=x/8;
            i++;
        }
        for(i=count-1; i>=0; i--)
        {
             printf("%d",arr[i]);
             fprintf(file,"%d",arr[i]);

        }
            i=count=0;
     while(k!=0)
    {
        arr2[i]=k%16;
        count+=1;
        k=k/16;
        if(arr2[i]<10)
        {
            arr2[i]=48+arr2[i];
        }
        else if(arr2[i]>=10)
        {
            arr2[i]=55+arr2[i];
        }
        i++;

    }
    fprintf(file,"\nHEX ");
    printf("\nHEX ");
    for(i=count-1; i>=0; i--)
    {
        printf("%c",arr2[i]);
        fprintf(file,"%c",arr2[i]);
    }
    }
    else if(name.a==3)
    {
        fprintf(file,"\nOCT ");
         printf("OCT ");
        scanf("%d",&name.c);
        x=octaldecimal(name.c);
        printf("DIC %d",x);
        fprintf(file,"\nDIC %d",x);
        k=x;
         i=count=0;
        while(x!=0)
    {
        arr[i]=x%2;
        count+=1;
        x=x/2;
        i++;
    }
    fprintf(file,"\nBIN ");
    printf("\nBIN ");
    for(i=count-1; i>=0; i--)
    {
        printf("%d",arr[i]);
        fprintf(file,"%d",arr[i]);

    }
               i=count=0;
     while(k!=0)
    {
        arr2[i]=k%16;
        count+=1;
        k=k/16;
        if(arr2[i]<10)
        {
            arr2[i]=48+arr2[i];
        }
        else if(arr2[i]>=10)
        {
            arr2[i]=55+arr2[i];
        }
        i++;

    }
    fprintf(file,"\nHEX ");
    printf("\nHEX ");
    for(i=count-1; i>=0; i--)
    {
        printf("%c",arr2[i]);
        fprintf(file,"%c",arr2[i]);
    }
    }
    else if(name.a==4)
    {
        fprintf(file,"HEX ");
        printf("HEX ");
        scanf("%s",str);
        x=hexadecimal_decimal(str);
        printf("DIC %d",x);
        fprintf(file,"\nDIC %d",x);
        k=x;
        i=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]);

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

    }
    }
    scanf("%d",&b);
    if(b==5)
    {
        goto point;
    }
    fclose(file);

}