for(bool write = false, short i = 0; arr[i] != '\0'; i++)
{
  if(write)
   std::cout << arr[i];
  if(arr[i] == ':')
   write = true;
  if(arr[i] == '\n')
   write = false;
}

#include <iostream>  
#include <conio.h>
using namespace std;  

int main( void )
{       
  setlocale( LC_ALL, "Russian" );
  FILE *f;
  char * pch;
  int i;
  f=fopen("G:\\TQS\\1.txt", "r");
  fseek(f,0,SEEK_END);  
  size_t L = ftell(f);  
  fseek(f,0,SEEK_SET);  
  char* c = new char[L];  
  for(i = 0; i<L; i++)  
  {  
   c[i] = fgetc(f);
//  cout << c[i];
  }
  pch=strchr(c,':');
  pch=pch+1;
  cout << pch;
  fclose(f);
  _getch();
  return 0;
}

#include <iostream>
#include <fstream>

int main()
{
  setlocale(0, "Rus");
  char arr[100];
  for(short i = 0; i < 100; arr[i++] = '\0');
  std::ifstream file("text.txt");
  for(short i = 0; !file.eof() && i < 100; arr[i++] = file.get());
  bool write = false;
  for(short i = 0; arr[i++] != '\0';)
  {  
   if(write)  
    std::cout << arr[i];  
   if(arr[i] == ':')  
    write = true;  
   if(arr[i] == '\n')  
    write = false;  
  }  
  std::cin.get();
  return 0;
}