Write a c program to add two very large numbers

Write a c program to add two very large or big numbers

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#include<stdio.h>

#include<string.h>

int main(){

    int a[255],b[255],sum[255];

    int ac=0,bc=0,sc=0;

    int reminder = 0,i;

    char num1[255],num2[255],*pa,*pb;

    printf("Enter first number : ");

    scanf("%s",&num1); //taking first number from user in string format

    printf("\nEnter second number : ");

    scanf("%s",&num2); //taking second number from user in string format

    pa = num1; //pointer to first number

    pb = num2; //pointer to second number

    //storing  first string number in the integer array

    while(*pa){  //loop while run untill it get null character

        a[ac++] = *pa++ - 48;  //48 is ASCII value of character zero

    }

    //storing  first string number in the integer array

    while(*pb){

         b[bc++] = *pb++ - 48;

    }

    //additin of two numbers

    if(ac<bc){

         for(i = ac;i > 0;i--){

             sum[sc++]= ((a[i-1] + b[--bc]) + reminder)%10;

             reminder = ((a[i-1] + b[bc]) + reminder)/10;

         }

         while(bc>0){

             sum[sc++] = b[--bc] + reminder;

             reminder = 0;

         }

    }

    else{

         for(i = bc;i > 0;i--){

             sum[sc++]= ((b[i-1] + a[--ac]) + reminder)%10;

            reminder = ((b[i-1] + a[ac]) + reminder)/10;

        }

         if(ac==0 && reminder==1)

             sum[sc++] = reminder;

            while(ac>0){

            sum[sc++] = a[--ac] + reminder;

                reminder = 0;

            }

    }

    printf("Sum of both number is : ");

    for(i=sc-1;i>=0;i--){

         printf("%d",sum[i]);

    }

    return 0;

}

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