C++处理输入输出
- 牛客OJ在线编程常见输入输出练习场
- [A A+B(1)](#A A+B(1))
- [B A+B(2)](#B A+B(2))
- [C A+B(3)](#C A+B(3))
- [D A+B(4)](#D A+B(4))
- [E A+B(5)](#E A+B(5))
- [F A+B(6)](#F A+B(6))
- [G A+B(7)](#G A+B(7))
- [H 字符串排序(1)](#H 字符串排序(1))
- [I 字符串排序(2)](#I 字符串排序(2))
- [J 字符串排序(3)](#J 字符串排序(3))
- C++输入输出要点总结
牛客OJ在线编程常见输入输出练习场
https://ac.nowcoder.com/acm/contest/5647
A A+B(1)
cpp
#include <iostream>
#include <sstream>
using namespace std;
int main() {
string line;
while (getline(cin, line)) {
istringstream iss(line);
int a, b;
iss >> a >> b;
cout << a + b << endl;
}
return 0;
}B A+B(2)
cpp
#include <iostream>
#include <sstream>
using namespace std;
int main() {
int t;
cin >> t;
cin.ignore(); // 忽略换行符
for (int i = 0; i < t; i++) {
string line;
getline(cin, line);
istringstream iss(line);
int a, b;
iss >> a >> b;
cout << a + b << endl;
}
return 0;
}C A+B(3)
cpp
#include <iostream>
#include <sstream>
using namespace std;
int main() {
string line;
while (getline(cin, line)) {
istringstream iss(line);
int a, b;
iss >> a >> b;
if (a == 0 && b == 0) {
break;
}
cout << a + b << endl;
}
return 0;
}D A+B(4)
cpp
#include <iostream>
#include <sstream>
#include <vector>
using namespace std;
int main() {
string line;
while (getline(cin, line)) {
istringstream iss(line);
int n;
iss >> n;
if (n == 0) {
break;
}
int sum = 0;
int num;
while (iss >> num) {
sum += num;
}
cout << sum << endl;
}
return 0;
}E A+B(5)
cpp
#include <iostream>
#include <sstream>
using namespace std;
int main() {
int t;
cin >> t;
cin.ignore(); // 忽略换行符
for (int i = 0; i < t; i++) {
string line;
getline(cin, line);
istringstream iss(line);
int n;
iss >> n;
int sum = 0;
int num;
while (iss >> num) {
sum += num;
}
cout << sum << endl;
}
return 0;
}F A+B(6)
cpp
#include <iostream>
#include <sstream>
using namespace std;
int main() {
string line;
while (getline(cin, line)) {
istringstream iss(line);
int n;
iss >> n;
int sum = 0;
int num;
while (iss >> num) {
sum += num;
}
cout << sum << endl;
}
return 0;
}G A+B(7)
cpp
#include <iostream>
#include <sstream>
using namespace std;
int main() {
string line;
while (getline(cin, line)) {
istringstream iss(line);
int sum = 0;
int num;
while (iss >> num) {
sum += num;
}
cout << sum << endl;
}
return 0;
}H 字符串排序(1)
cpp
#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
int n;
cin >> n;
cin.ignore(); // 忽略换行符
string line;
getline(cin, line);
istringstream iss(line);
vector<string> strs;
string word;
while (iss >> word) {
strs.push_back(word);
}
sort(strs.begin(), strs.end());
for (size_t i = 0; i < strs.size(); i++) {
if (i > 0) cout << " ";
cout << strs[i];
}
cout << endl;
return 0;
}I 字符串排序(2)
cpp
#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
string line;
while (getline(cin, line)) {
istringstream iss(line);
vector<string> strs;
string word;
while (iss >> word) {
strs.push_back(word);
}
sort(strs.begin(), strs.end());
for (size_t i = 0; i < strs.size(); i++) {
if (i > 0) cout << " ";
cout << strs[i];
}
cout << endl;
}
return 0;
}J 字符串排序(3)
链接：https://ac.nowcoder.com/acm/contest/5647/J
输入描述:
多个测试用例，每个测试用例一行。
每行通过,隔开，有n个字符，n＜100
输出描述:
对于每组用例输出一行排序后的字符串，用','隔开，无结尾空格
cpp
#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
string line;
while (getline(cin, line)) {
vector<string> strs;
size_t pos = 0;
string token;
// 手动按逗号分割
while ((pos = line.find(',')) != string::npos) {
token = line.substr(0, pos);
strs.push_back(token);
line.erase(0, pos + 1);
}
// 添加最后一个元素
if (!line.empty()) {
strs.push_back(line);
}
sort(strs.begin(), strs.end());
for (size_t i = 0; i < strs.size(); i++) {
if (i > 0) cout << ",";
cout << strs[i];
}
cout << endl;
}
return 0;
}C++输入输出要点总结
| 场景 | 写法 |
|---|---|
| 引入头文件 | #include <iostream>, <sstream> |
| 使用命名空间 | using namespace std; |
| 读取一行 | getline(cin, line) |
| 创建字符串流 | istringstream iss(line) |
| 从流中读取整数 | iss >> num |
| 忽略换行符 | cin.ignore() |
| 字符串分割（空格） | 使用istringstream配合>>运算符 |
| 字符串分割（其他分隔符） | 使用find()和substr()手动分割 |
| 向量排序 | sort(vec.begin(), vec.end()) |
| 输出带分隔符 | 循环输出，条件判断是否添加分隔符 |
| 编译命令 | clang++ -std=c++18 file.cpp -o output |