C++是使用最廣泛的編程語(yǔ)言之一。它每天都被數(shù)百萬(wàn)程序員使用,是競(jìng)爭(zhēng)性編程的首選語(yǔ)言。在這里,我們將列出11 C++代碼片段,可以幫助您解決日常編程問(wèn)題。因此,事不宜遲,讓我們開(kāi)始吧。

我們嗯可以使用 size() 函數(shù)找到向量的大小。
#include <bits/stdc++.h>using namespace std; int main(){ vector <int> arr1 = {1, 2, 3, 4}; vector <int> arr2 = {}; vector <float> arr3 = {1.2, 3.8, 3.0, 2.7, 6.6}; cout << "Size of arr1: " << arr1.size() << endl; cout << "Size of arr2: " << arr2.size() << endl; cout << "Size of arr3: " << arr3.size() << endl; return 0;}輸出:
Size of arr1: 4Size of arr2: 0Size of arr3: 5我們可以使用 shuffle() 函數(shù)在C++中隨機(jī)排列數(shù)組。
#include <bits/stdc++.h>using namespace std; int main(){ vector <int> arr = {1, 2, 3, 4}; unsigned seed = 0; cout << "Original array:"; for (int ele: arr) { cout << ele << " "; } cout << endl; shuffle(arr.begin(), arr.end(), default_random_engine(seed)); cout << "Shuffled array:"; for (int ele: arr) { cout << ele << " "; } return 0;}輸出:
Original array:1 2 3 4Shuffled array:2 3 1 4我們可以使用C++ STL 庫(kù)的內(nèi)置 swap() 函數(shù)交換C++中的兩個(gè)變量。
#include <bits/stdc++.h>using namespace std; int main(){ int x = 5, y = 10; string str1 = "MakeUseOf", str2 = "MUO"; cout << "Before Swapping: " << endl; cout << "x: " << x << endl; cout << "y: " << y << endl; cout << "str1: " << str1 << endl; cout << "str2: " << str2 << endl; swap(x, y); swap(str1, str2); cout << "After Swapping: " << endl; cout << "x: " << x << endl; cout << "y: " << y << endl; cout << "str1: " << str1 << endl; cout << "str2: " << str2 << endl; return 0;}輸出:
Before Swapping:x: 5y: 10str1: MakeUseOfstr2: MUOAfter Swapping:x: 10y: 5str1: MUOstr2: MakeUseOf我們可以使用以下過(guò)程找到數(shù)字的數(shù)字總和:
#include <bits/stdc++.h>using namespace std; int main(){ int num = 4635, sum = 0, temp; while (num != 0) { temp = num%10; sum = sum+temp; num = num/10; } cout << "Sum: " << sum << endl; return 0;}輸出:
Sum: 18將一個(gè)矢量復(fù)制到另一個(gè)矢量C++可以使用賦值運(yùn)算符或?qū)⑾蛄孔鳛闃?gòu)造函數(shù)傳遞來(lái)執(zhí)行相同的操作。
#include <bits/stdc++.h>using namespace std; void printVector(vector <int> vec){ for (auto ele: vec) { cout << ele << " "; } cout << endl;} int main(){ vector <int> vec = {1, 2, 3, 4, 5}; printVector(vec); // Method 1: Using Assignment Operator vector <int> newVec1 = vec; printVector(newVec1); // Method 2: By passing vector as constructor vector <int> newVec2(vec); printVector(newVec2); return 0;}輸出:
1 2 3 4 51 2 3 4 51 2 3 4 5我們可以分別使用max_element()和min_element()函數(shù)從數(shù)組中找到最大和最小元素。
#include <bits/stdc++.h> using namespace std; int main(){ int arr[] = {23, 56, 87, 12, 56}; int size = sizeof(arr)/sizeof(arr[0]); cout << "Max element: " << *max_element(arr, arr+size) << endl; cout << "Min element: " << *min_element(arr, arr+size) << endl; return 0;}輸出:
Max element: 87Min element: 12我們可以使用 insert() 函數(shù)在集合中插入元素。此函數(shù)接受元素作為將插入到集合中的參數(shù)。
#include <bits/stdc++.h>using namespace std; int main(){ set<string> st; st.insert("Make"); st.insert("Use"); st.insert("Of"); st.insert("Of"); for (auto it = st.begin(); it != st.end(); it++) { cout << *it << " "; } return 0;}輸出:
Make Of Use可以使用以下方法從字符串中刪除重復(fù)字符:
#include <bits/stdc++.h>using namespace std; void removeDuplicateCharacters(char str[], int size){ int newIndex=0; // Traversing through all the characters for (int i = 0; i < size; i++) { int j; // Traversing loop from the first character to current character for (j = 0; j < i; j++) { if (str[i] == str[j]) { break; } } if (j == i) { str[newIndex++] = str[i]; } } // After removing duplicates, we make // the vacant part of string to null str[newIndex] = '/0';}int main(){ char str[] = "MakeUseOf"; int size = strlen(str); cout << "Original String: " << endl; cout << str << endl; removeDuplicateCharacters(str, size); cout << "New String: " << endl; cout << str << endl; return 0;}輸出:
Original String:MakeUseOfNew String:MakeUsOf您可以使用 length() 函數(shù)查找C++字符串的長(zhǎng)度。或者,您也可以使用 size() 函數(shù)(它是長(zhǎng)度() 函數(shù)的別名)。
#include <bits/stdc++.h>using namespace std; int main(){ string str1 = "MakeUseOf"; cout << "Length of " << str1 << " : " << str1.length() << endl; string str2 = "lorem ipsum"; cout << "Length of " << str2 << " : " << str2.size() << endl; return 0;}輸出:
Length of MakeUseOf : 9Length of lorem ipsum : 11可以使用以下方法從數(shù)組中刪除元素:
#include <bits/stdc++.h>using namespace std; int deleteElementFromArray(int arr[], int size, int elementToBeDeleted){ int i, j; // Search if elementToBeDeleted is present // in the array or not for (i = 0; i < size; i++) { if (arr[i] == elementToBeDeleted) { break; } } // If elementToBeDeleted is found in the array if (i < size) { // We need to reduce the size of the array // and shift the rest elements size = size - 1; for (j = i; j < size; j++) { arr[j] = arr[j+1]; } } // New array size is returned return size;} void printArrayElements(int arr[], int size){ for (int i = 0; i < size; i++) { cout << arr[i] << " "; } cout << endl;}int main(){ int arr[] = {1, 2, 3, 4, 5}; int size = sizeof(arr)/sizeof(arr[0]); cout << "Original Array: " << endl; printArrayElements(arr, size); int elementToBeDeleted = 3; size = deleteElementFromArray(arr, size, elementToBeDeleted); cout << "New array: " << endl; printArrayElements(arr, size); return 0;}輸出:
Original Array:1 2 3 4 5New array:1 2 4 5 有時(shí),直接理解復(fù)雜的代碼并不容易。您應(yīng)該遵循一些基本的編程原則,如記錄代碼、重構(gòu)等,以使代碼更加健壯。
您可以通過(guò)多種方式循環(huán)訪(fǎng)問(wèn)向量。以下是迭代向量的三種最常用的方法:
(1) 使用范圍:
#include <bits/stdc++.h>using namespace std; int main(){ vector <int> vec = {1, 2, 3, 4, 5}; // Method 1: Using range for for (auto element: vec) { cout << element << " "; } return 0;}使用索引#include <bits/stdc++.h>using namespace std; int main(){ vector <int> vec = {1, 2, 3, 4, 5}; // Method 2: Using indexing for (int i = 0; i < vec.size(); i++) { cout << vec[i] << " "; } return 0;}(2) 使用迭代器的引用:
#include <bits/stdc++.h>using namespace std; int main(){ vector <int> vec = {1, 2, 3, 4, 5}; // Method 3: Using reference of the iterator for (auto it = begin(vec); it != end(vec); it++) { cout << *it << " "; } return 0;}以上三個(gè)代碼將顯示相同的輸出:
1 2 3 4 5(3) 利用C++代碼片段
利用這些C++代碼片段來(lái)解決日常編程問(wèn)題。無(wú)論您是使用C++編寫(xiě)簡(jiǎn)單程序還是競(jìng)爭(zhēng)編程,這些代碼片段都可以派上用場(chǎng)。
本文鏈接:http://m.www897cc.com/showinfo-26-100336-0.html介紹 11 個(gè)常用的 C++ 代碼
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