C How can i remove the last comma?-CodePudding

    #include <iostream>
    using namespace std;
    

    int main() {
      string x;
      cin >> x;
      char ch;
     
/* how can i remove the last comma? */
      int l = x.length();
      for (int i = 0; i < l; i  ) {
        ch = x.at(i);
        cout << ch << ",";}
      return 0;
    }

I expect: input: 1234 output: 1,2,3,4 but now: input: 1234 output: 1,2,3,4,

CodePudding user response：

Just print the first char and then print all the other elements preceeded by a comma. You need to deal with the special case of the empty string of course:

if (!x.empty())
{
    std::cout << x[0];
    for (auto pos = x.begin()   1; pos != x.end();   pos)
    {
        std::cout << ',' << *pos;
    }
}
std::cout << '\n';

CodePudding user response：

Do this(Basically you print the comma separately between that you check if it is the last iteration and works for any numbers):

#include <iostream>
using namespace std;

int main() {
  string x;
  cin >> x;
  char ch;
 
/* how can i remove the last comma? */
  int l = x.length();
  for (int i = 0; i < l; i  ) {
    ch = x.at(i);
    
    cout << ch ;
    if (i==l-1) {break;}
    cout << ",";}
  return 0;
}