cin

问题 I'm a beginner programmer in C++ (currently), and I've got a conceptual question. I'm trying to filter a cin input to ensure that it is a one-or-two-digit integer between 01-04, and if it isn't, to produce an error and ask for a new input. I'm also using map to give the user a list of options that, upon valid selection, routes inputs (integers) through any of several methods to produce a relevant result, but I'll ask a more specific version of this question elsewhere. I found a snippet of

问题 I'm writing a program that prompts the user for: Size of array Values to be put into the array First part is fine, I create a dynamically allocated array (required) and make it the size the user wants. I'm stuck on the next part. The user is expected to enter in a series of ints separated by commas such as: 1,2,3,4,5 How do I take in those ints and put them into my dynamically allocated array? I read that by default cin takes in integers separated by whitespace, can I change this to commas?

问题 I'm writing a program that prompts the user for: Size of array Values to be put into the array First part is fine, I create a dynamically allocated array (required) and make it the size the user wants. I'm stuck on the next part. The user is expected to enter in a series of ints separated by commas such as: 1,2,3,4,5 How do I take in those ints and put them into my dynamically allocated array? I read that by default cin takes in integers separated by whitespace, can I change this to commas?

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I am writing a program that allows a student to write a question and store that Question (or string) in a variable, can anyone please

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I am writing a program that allows a student to write a question and store that Question (or string) in a variable, can anyone please

问题 I have some code that basically looks like this int a; cin>>a; if(!cin.good()) { std::cin.clear(); std::cin.ignore(2); // set some default value for 'a' and display some messages } this works fine if I give an integer (as expected) or if I try to mess with it a little and give upto 2 chars. eg. 'ss' , but if I give a 3 char input 'sss' , the last 's' is not ignored and is accepted as the input for some more cin's that I have in my program down the line. Is there any way to count the number of

问题 So I was trying to read something from cin and spaces cut them, For example, if I got AA 3 4 5 111 222 33 from cin, I want to store them in a string array. My code so far is string temp; int x = 0; string array[256]; while(!cin.eof()) { cin >> temp; array[x] = temp; x += 1; } but then the program crashed. Then I added cout to tried figure out what is in temp and it shows: AA345 So how can I store the input into an array with spaces cutting them? 回答1: Here's one possibility to treat an input

问题 Here is my code: #include <iostream> using namespace std; int main(){ char inp[5], out[4]; cin >> inp >> out; cout << inp << endl; cout << out << endl; system("pause"); return 0; } when I type: 12345 6789 It gives me: 6789 Why I failed to save the 5 words char array 'inp' and it showed nothing? The second input looks normal though. However, when I set out[3] or out[5], it seems to work alright? It seem that two char array of [5] then followed by [4] would cause problem... 回答1: I see that you

问题 when reading from std::cin even if I want to read only one char. It will wait for the user to insert any number of chars and hit Enter to continue ! I want to read char by char and do some instructions for every char while the user is typing in the terminal. Example if I run this program and type abcd then Enter the result will be abcd abcd But I want it to be : aabbccdd Here is the code : int main(){ char a; cin >> noskipws >> a; while(a != '\n'){ cout << a; cin >> noskipws >> a; } } How to

问题 All, I've got some code here that I can't explain the behavior of. It is posted below. I looked at Why does integer overflow cause errors with C++ iostreams?, but it doesn't really answer my question. #include <iostream> #include<stdio.h> using namespace std; int main() { int x; scanf("%d", &x); cout << "Value of x = " << x << endl; cin >> x; cout << "Failure Detected = " << cin.fail() << endl; cout << "Value of x = " << x << endl; return 0; } So, what I expect this code to do is read in an