Division of large numbers in c

1. C code for division of very big numbers.  

2. How to get division of two very large numbers larger or beyond than long int in c programming language.

#include<stdio.h>

#include<string.h>

#define MAX 10000

int validate(char []);

char * division(char[],long);

long int remainder;

int main(){

    char dividend[MAX],*quotient;

    long int divisor;

    printf("Enter dividend: ");

    scanf("%s",dividend);

    if(validate(dividend))

         return 0;

    printf("Enter divisor: ");

    scanf("%ld",&divisor);

    quotient = division(dividend,divisor);

    while(*quotient)

         if(*quotient ==48)

             quotient++;

         else

             break;

    printf("Quotient: %s / %ld  =  %s",dividend,divisor,quotient);

    printf ("\nRemainder: %ld",remainder);

    return 0;

}

int validate(char num[]){

    int i=0;

    while(num[i]){

         if(num[i] < 48 || num[i]> 57){

             printf("Invalid positive integer: %s",num);

             return 1;

         }

         i++;

    }

    return 0;

}

char * division(char dividend[],long divisor){

   

    static char quotient[MAX];

    long temp=0;

    int i=0,j=0;

    while(dividend[i]){

        

         temp = temp*10 + (dividend[i] -48);

         if(temp<divisor){

            

             quotient[j++] = 48;

            

         }

         else{

             quotient[j++] = (temp / divisor) + 48;;

             temp = temp % divisor;

         }

         i++;

    }

    quotient[j] = '\0';

    remainder = temp;

    return quotient;

}

Sample output:

Enter dividend: 543109237823560187

Enter divisor: 456

Quotient: 543109237823560187 / 456 = 1191029030314824

Remainder: 443

Other program (source code):

#include<stdio.h>

#include<math.h>

#include<stdlib.h>

#include<string.h>

#define MAX 10000

char * division(char [],unsigned long);

int main(){

    char a[MAX];

    unsigned long b;

    char *c;

    printf("Enter the divdend : ");

    scanf("%s",a);

    printf("Enter the divisor : ");

    scanf("%lu",&b);

    c = division(a,b);

    printf("\nQuotient of the division : ");

    printf("%s",c);

    return 0;

}

char * division(char a[],unsigned long b){

    static char c[MAX];

    int la;

    int i,k=0,flag=0;

    unsigned long temp=1,reminder;

    la=strlen(a);

    for(i=0;i<=la;i++){

         a[i] = a[i] - 48;

    }

    temp = a[0];

    reminder = a[0];

    for(i=1;i<=la;i++){

         if(b<=temp){

             c[k++] = temp/b;

             temp = temp % b;

             reminder = temp;

             temp =temp*10 + a[i];

             flag=1;

         }

         else{

             reminder = temp;

             temp =temp*10 + a[i];

             if(flag==1)

                 c[k++] = 0;

         }

    }

    for(i=0;i<k;i++){

         c[i]=c[i]+48;

    }

    c[i]= '\0';

    printf("Reminder of division:  %lu  ",reminder);

    return c;

}

Sample output:

Enter the divdend:

55555555555555555555555555555555555555555

Enter the divisor: 5

Reminder of division:  0

Quotient of the division:

11111111111111111111111111111111111111111