CODEWITHSUNDEEP
c++buffercingetline
Abhinav Tahlani
Abhinav Tahlani

Reputation: 199

C++ getline() function malfunctioning for inputs with no whitespaces

Here is a code in which I've been facing difficulties lately-

int main(){

ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n,k;
cin >> n >> k;
cin.ignore();
int arr[n];
fill_n(arr , n, 0);
int brr[n];
fill_n(brr , n, 1);
for(int i=1;i<=k;i++){ //Loop 1
    char str[8];
    cin.getline(str,9);
    if(str=="CLOSEALL") //block 1
        memset(arr , 0, n * sizeof(arr[0]));
    else{
        arr[str[6]-'0'-1]=1*brr[str[6]-'0'-1];
        if(brr[str[6]-'0'-1]==0)
            brr[str[6]-'0'-1]=1;
        else
            brr[str[6]-'0'-1]=0;
            }
    int c=0;
    for(int j=0;j<n;j++){
        if(arr[j]==1)
        c++;
    }

    cout << c << endl;
}

The problem I've been facing is with the input. According to the question, the input commands can be CLICK N, where N is an integer, or CLOSEALL (note the exact case and number of whitespaces). Whenever I work with an input of CLICK N, the program runs fine, but as soon as I input CLOSEALL, it doesn't execute the block 1(mentioned in the code) and the program terminates immediately, even if Loop 1(mentioned in the code) has to go on till the input value of k. I assume that it's some problem related to the getline() buffer, as CLOSEALL doesn't have any whitespace and is malfunctioning, while CLICK N has a whitespace and isn't malfunctioning. Can someone suggest how to correct this flush discrepancy, so that the code works perfectly?

PS: I haven't included the question, as I believe it's of no use here. Also, I've included the packages in my code as required. If someone needs the question, I would edit my post.

Upvotes: 0

Views: 111

Answers (1)

Vincent55
Vincent55

Reputation: 33

you can try std::stringstream

// swapping ostringstream objects
#include <string>       // std::string
#include <iostream>     // std::cout
#include <sstream>      // std::stringstream

int main () {
  std::string str;
  std::cin >> str;
  std::stringstream ss;

  ss << str;

  int foo,bar;
  ss >> foo >> bar;

  std::cout << "foo: " << foo << '\n';
  std::cout << "bar: " << bar << '\n';

  return 0;
}
// in: 
// 100 200
// out: 
// foo: 100
// bar: 200

Upvotes: 1

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