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(C++) Answer of exercise #9: No for-loops #11

 

This is the answer of Exercise #9: No for-loops.

 

 

 

 

 

Question #11: Replace zero by one

 

Replace the for-loop. You will need:

 

#include <vector>
 
void ReplaceZeroByOne(std::vector<int>& v)
{
  const int sz = v.size();
  for (int i=0; i!=sz; ++i)
  {
    if(v[i]==0) v[i]=1;
  }
}

 

 

 

 

 

Answer using std::replace

 

The preferred way: it is easiest to read and shortest to write.

 

#include <vector>
#include <algorithm
 
void ReplaceZeroByOne(std::vector<int>& v)
{
  std::replace(v.begin(),v.end(),0,1);
}

 

 

 

 

 

Answer using std::replace_if

 

Not preferred, use the solution above instead.

 

#include <vector>
#include <algorithm
#include <numeric>
 
void ReplaceZeroByOne(std::vector<int>& v)
{
  std::replace_if(v.begin(),v.end(),
    std::bind2nd(std::equal_to<int>(),0),1);
}

 

 

 

 

 

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