#include<stdio.h>
#include<gmp.h>
#include<gmpxx.h>
#include<iostream>
#include<vector>
#include<cstring>
#include<fstream>
using namespace std;
mpz_t n;
void read_n();

int main()
{
    FILE *fp=fopen("../outputs/t1.txt", "r");
    char ch;
    vector<string> blocks_str;
    // vector<mpz_t> blocks;

    vector<string> :: iterator itr;
    string str,s;                                                 //to strore temp read file contents
    mpz_t F,f,b_size,temp;
    mpz_inits(F,f,b_size,temp,n,NULL);
    mpz_set_ui(b_size,8);           // size of each block
    int i=0,t=0,t1=0;

    fseek(fp, 0, SEEK_END);

    fseek(fp, 0, SEEK_SET);
    while((ch=getc(fp))!=EOF){
      t=(int) ch;
      str+=to_string(t);
    }

    mpz_set_ui(F,str.length());
    mpz_cdiv_q(f,F,b_size);                      // no of total blocks

    // gmp_printf("b_size -> %Zd\nF -> %Zd\nf -> %Zd\n",b_size,F,f);
    mpz_t blocks[mpz_get_ui(f)] ;
    for (i = 0; i < mpz_get_ui(f); i++) {
      mpz_init(blocks[i]);
    }
    read_n();
    // gmp_printf("%Zd\n",n);
    i=0;
    char *cstr;
    while(i!=str.length()){
      if(mpz_cmp_ui(b_size,s.length())==0){
        cstr=(char *) malloc(1+s.length());
        strcpy(cstr,s.c_str());
        mpz_set_str(temp,cstr,10);            // needs c style char string , not string
        mpz_set(blocks[t1],temp);
        mpz_mod(blocks[t1],blocks[t1],n);
        t1++;
        s.clear();
      }
      s+=str[i];
      i++;
    }
    if(s.length()!=0){
      while(mpz_cmp_ui(b_size,s.length())!=0)
        s+='0';
      cstr=(char *) malloc(1+s.length());
      strcpy(cstr,s.c_str());
      mpz_set_str(temp,cstr,10);            // needs c style char string , not string
      mpz_set(blocks[t1],temp);
      mpz_mod(blocks[t1],blocks[t1],n);
      t1++;
      s.clear();
    }
    // cout<<"index\tblock\n";
    for (i = 0; i < mpz_get_ui(f); i++) {
      // cout<<i<<"\t";
      gmp_printf("%d %Zd\n",i,blocks[i]);
    }

    fclose(fp);                             // closing the file pointer

    return 0;
}


void read_n(){

  fstream key_file;
  string word,filename,n_keygen;
  // read values from keygen and file_blocks
  filename = "../outputs/key_gen_out.txt";
  key_file.open(filename.c_str());
  int i=1;
  while (key_file >> word)
  {
      if(i%3==0 && i%6!=0 && i%9!=0 && i%12!=0 && i%15!=0)
        n_keygen=word;
      i++;
  }
  mpz_set_str (n,n_keygen.c_str(),10);
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}