#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
#define MAX 10000

char * addition(char a[],char b[]){
    
    static char add[MAX];
    char c[MAX];
    int temp;
    int la,lb;
    int i,j,k=0,x=0,y;
    long int car=0;
    long sum = 0;
    la=strlen(a)-1;
    lb=strlen(b)-1;
    //printf("\n la=%d lb=%d ",la,lb);
    for(i=0;i<=la;i++){ a[i] = a[i] - 48; }
    for(i=0;i<=lb;i++){ b[i] = b[i] - 48; }
    
   if(la>lb){
       y=0;
       k=la;
   
   }
   else{
       k=lb;
       y=1;
   }
    //printf("\nAddition called ");
    for(i=la,j=lb;i>=0,j>=0;i--,j--){
        //printf("Addition called ");
        c[k--]=(car+a[i]+b[j])%10;
        car=(car+a[i]+b[j])/10;
    }//for
    printf("\nWithout carry %s",c);
    
    if(y=0){
        j=0;
        for(i=0;i<la+1;i++){
        add[j++]=c[i] + 48;
        }
        add[j]='\0';
    }
    else{
        j=0;
        for(i=0;i<lb+1;i++){
        add[j++]=c[i] + 48;
        }
        add[j]='\0';
    }
    return add;

}


char * multiply(char a[],char b[]){
    static char mul[MAX];
    char c[MAX];
    char temp[MAX];
    int la,lb;
    int i,j,k=0,x=0,y;
    long int r=0;
    long sum = 0;
    la=strlen(a)-1;
    lb=strlen(b)-1;
   
        for(i=0;i<=la;i++){
                a[i] = a[i] - 48;
        }

        for(i=0;i<=lb;i++){
                b[i] = b[i] - 48;
        }

    for(i=lb;i>=0;i--){
         r=0;
         for(j=la;j>=0;j--){
             temp[k++] = (b[i]*a[j] + r)%10;
             r = (b[i]*a[j]+r)/10;
         }
         temp[k++] = r;
         x++;
         for(y = 0;y<x;y++){
             temp[k++] = 0;
         }
    }
   
    k=0;
    r=0;
    for(i=0;i<la+lb+2;i++){
         sum =0;
         y=0;
         for(j=1;j<=lb+1;j++){
             if(i <= la+j){
                 sum = sum + temp[y+i];
             }
             y += j + la + 1;
         }
         c[k++] = (sum+r) %10;
         r = (sum+r)/10;
    }
    c[k] = r;
    j=0;
    for(i=k-1;i>=0;i--){
         mul[j++]=c[i] + 48;
    }
    mul[j]='\0';
    return mul;
}

int main(){
    char a[MAX]={'9','5','5','5','5' };
    char b[MAX]={'3','3','3','3','3','3','3','3','3','3'};
    char *c;
    int la,lb;
    //int i = 0;
    int i = 1;
    //int i = 2;

    printf("Answer of two numbers : ");
    switch(i){
        case 0:  c = multiply(a,b); break;
        case 1:  c = addition(a,b); break;
        //case 2:  c = sub(a,b); break;
        default: break;
    }
    //c = multiply(a,b);
    printf("%s",c);
    return 0;
}