c++ 中的额外线路为 output

Question

int main() {
string n;
int number_of_test_cases;
cin>>number_of_test_cases;
for (int i = 0; i <= number_of_test_cases; i++) {
    getline(cin,n);
    for (int p = 0; p < n.size(); p++)
    {
        if (p%2==0){
            cout<<n[p];
        }
    }cout<<" ";
    for (int p = 0; p < n.size(); p++)
    {
        if (p%2!=0){
            cout<<n[p];
        }
    }cout<<endl;
}return 0;}

This code first takes number of test cases as input number_of_test_cases,then it runs loop n times in which it first takes input string then it runs a loop to print even indexed characters then space then again runs a loop to print odd indexed characters then it prints a endline.

Now the problem is that after giving number_of_test_cases as input it is printing a unwanted line. So now i want to get rid of that extra line.

This question is from hackerrank: https://www.hackerrank.com/challenges/30-review-loop/problem

for input 2 Hacker Rank its giving output

Hce akr
Rn ak

instead of

Hce akr
Rn ak

Answer 1

Use cin.ignore() after scanning the integer before using getline function. Also the condition in your for loop should be i < j .