I wrote and run this code in Windows, in DEV C++ but I am keep getting a Segmentation fault on Ubuntu's terminal when I try to run this program. Here is my whole code.

#include<iostream>
#include<string>
#include<fstream>
#include<cmath>

using namespace std;

int Str2NumByAscii(const string& str); // convert string to number
                                       // by means of ascii table for
                                       // numbers 0-9 (ascii code: 48-57)
int* findRegister(string regreader1, string* regname, int* regadress[]);

void MOV(int* Rx, int* Ry);
void ADD(int* Rx, int* Ry);
void SUB(int* Rx, int* Ry);
void HLT(int* RegAdr[]);
void JMP(int *Rx, int number, int linenum,ifstream &read, string operation, string regreader1,string regreader2);

int main() {

    int R1=1,R2=2,R3=3,R4=4,R5=5;
  int* regadress[5]={&R1,&R2,&R3,&R4,&R5};
    string regname[5]={"R1","R2","R3","R4","R5"};

//  cout<<"Registered values before any operation\n";
//  HLT(regadress);

    string operation;//that string is for makin
  string regreader1;
  string regreader2;

    ifstream read;
    read.open("example.txt");

  int linenum = 0;
  string line;

     while (!read.eof()){
    getline(read, line);
    cout<<line<<endl;
    linenum++;
  }

  cout<<"total number of lines in file : " <<linenum<<endl;

  read.close();
  read.open("example.txt"); // for going the beginning of the file

  int current_line = 1; // keeps the number of current line
  while (!read.eof()){
    getline(read, operation,  ' ')  ;
    getline(read, regreader1, ',')  ;
    getline(read, regreader2, '\n') ;
    current_line++;

    int number;
    int* Rx = findRegister(regreader1,regname,regadress);

    int* Ry=findRegister(regreader2,regname, regadress);

if(!Ry) {
      number = Str2NumByAscii(regreader1);
      // call JMP function here
    }
    if(operation == "MOV"){
      MOV(Rx,Ry);
    }
    else if (operation == "ADD"){
      ADD(Rx,Ry);
    }
    else if(operation == "SUB"){
      SUB(Rx,Ry);
    }
  else if(operation== "JMP"){
    JMP(Rx,number,current_line, read, operation, regreader1,regreader2 );
  }
else if(operation=="HLT"){
    HLT(regadress);
    return 0;

}
  }
  cout<<"Registered values after any operation\n";
  HLT(regadress);
    return 0;

} // end of main()

int* findRegister( string regreader1, string* regname, int* regadress[] ){
  for(int i=0; i<5; ++i){
    if(regreader1==regname[i]){
      return regadress[i];
    }
  }
  return 0; // nullptr
}

int Str2NumByAscii(const string& str){
  int N = str.size();
  int number = 0 ;
  for(int i = 0; i < N; ++i ){
    char ch = str[i];
    int num = ch - 48;
    number += num * pow(10,N-i-1) ;
  }
  return number;
}

void MOV(int* Rx, int* Ry){
  *Rx = *Ry ;
}

void ADD(int* Rx, int* Ry){
  *Rx = *Rx + *Ry ;
}

void SUB(int* Rx, int* Ry){
  *Rx = *Rx - *Ry ;
}

void HLT(int* RegAdr[]){
  for(int i = 0 ; i < 5 ; ++i )
    cout<<*RegAdr[i]<<" ";
  cout<<"\n";

}
void JMP(int *Rx, int number, int linenum,ifstream &read, string operation, string regreader1,string regreader2){

if(Rx==0){
    while(number>=linenum && !read.eof()){
            getline(read, operation,  ' ')  ;
    getline(read, regreader1, ',')  ;
    getline(read, regreader2, '\n') ;

    }
}
}

/* example.txt
MOV R1,R2
SUB R1,R2
JMP R1,2
SUB R4,R5
HLT
*/

I am getting an segmentation fault about this function.

  int* findRegister( string regreader1, string* regname, int* regadress[] ){
      for(int i=0; i<5; ++i){
        if(regreader1==regname[i]){
          return regadress[i];
        }

Could you please help me ?

@Baran_1: CodeBlocks is a development UI that uses GCC under the covers to compile stuff. What compiler version are you running?