Help me to use the transform() in C++ coding

[Tailor]

Hello, How are you All. I am the student of the MscCS. I must have to submit the assignment on the functions of the C++ library in four days. I could also had the well knowledge of the functions that could be used in the C++ programming language. Even though, I could not know much more about the transform() function of the C++ programming language. So, I would like to know about the transform() function of the C++ programming language. I also would like to know How the transform() function could be used in the C++ Programs. Reply Me!!

[Praetor]

The transform() function can be used in the C++ language to apply the function to the given range of an element. The following can be the general syntax of the transform() function :

template < class InptItrtr, class OtptItrtr, class UnryOprtr >
  OtptItrtr transform ( InptItrtr first1, InptItrtr last1,
                             OtptItrtr result, UnryOprtr op );

[Katty]

I think you can have to under go through the following code of lines of the program that can help's you to get the knowledge or the information of the replace_if() function in the C++ language :

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int opincrease (int i)
 {
 return ++i; 
}
int opsum (int i, int j) 
{ 
return i+j;
 }
int main ()
 {
  vector<int> fst;
  vector<int> scnd;
  vector<int>::iterator t;
  for (int i=1; i<6; i++) fst.pushback (i*10); 
  second.resize(fst.size());    
  transform (fst.begin(), fst.end(), scnd.begin(), opincrease);  
  transform (fst.begin(), fst.end(), scnd.begin(), fst.begin(), opsum);
  cout << "first contains:";
  for (t=fst.begin(); t!=fst.end(); ++t)
    cout << " " << *t;
  cout << endl;
  return 0;
}

Output:

first contains: 21 41 61 81 101

[kelfro]

Hello, According to my knowledge of the transform() function is that the transform() function can be used in the C++ programming to apply first version to all of an elements in the input range ([fst1,lst1)) and can stores each value that can be returned in the range beginning at result. I hope you should understand from the this explanation. If you can not get it then reply me!!!!

[Zecho]

The following can be the parameters of the transform() function in the C++ language :
1. op : This parameter of the transform() function can be used for the unary function that can taking one element as an argument and can returns the some value that can be as result.
2. fst1, lst1 : These parameters of the transform() function can be used for input iterators to the final and starting positions of the sequence that can be first. The range used can be as [fst1,lst1).
3. rslt : This parameter of the transform() function can be used for output iterator to the starting position of the range where the results of the functions can be stored.

[absolute55]

There can be one more another program that can also help's you to know or to get the knowledge of the transform() function in the C++ language :

int increment(int i)
 { 
return ++i;
 }
int sm(int a, int b)
 {
 return a+b; 
}
int main()
 {
  vector<int> w1;
  for(int i=1; i<6; i++) w1.push_back (i*i);    
  vector<int> w2(w1.size());
  transform(w1.begin(), w1.end(), w2.begin(), increment);      
  transform(w1.begin(), w1.end(), w2.begin(), w1.begin(), sm); 
   return 0;
}