小程序 || 語句

Program 1:

程序1：

#include <iostream> using namespace std;int main() {if (NULL) {cout << "Hello World";}else {cout << "Hii World";}return 0; }

Output:

輸出：

Hii World

Explanation:

說明：

The program will print "Hii World" on the console screen. Because the value of NULL is 0, then the if statement will be false and the else part will be executed.

該程序將在控制臺屏幕上打印“ Hii World” 。 因為NULL的值為0 ，所以if語句將為false并將執行else部分。

Program 2:

程式2：

#include <iostream> using namespace std;int main() {int A = 5, B = 10, C = 20;if (A && B > C) {cout << "ABC";}else if (A = B || C == 20) {cout << "PQR";}else {cout << "XYZ";}return 0; }

Output:

輸出：

PQR

Explanation:

說明：

Execute the program step by step:

逐步執行程序：

int A=5, B=10, C=20;if(A&&B>C)if(5&&10>20)According to operator priority table, greater than (>) operator will evaluate before the logical and (&&) thenif(5&&0)if(0) Then, program's execution will jump to,else if(A=B || C==20)According to the operator priority table, equal to (==) operator will be evaluated before the assignment and logical or operatorelse if(10 || 20)else if(1)Here, condition is true and its block will be executed,Then the final output will be "PQR".

Program 3:

程式3：

#include <iostream> using namespace std;int main() {int A = 15, B = 10, C = 20;if (A > B) {if (A >= 15) {if (C > 10 ? A > 5 ? NULL : 1 : 2) {cout << "111";}else {cout << "222";}}else {cout << "333";}}else {cout << "444";}return 0; }

Output:

輸出：

222

Explanation:

說明：

Execute the program step by step:

逐步執行程序：

int A=15, B=10, C=20;if( A>B) that is if(15>10) condition is true thenif(A>=15) that is if(15>=15) condition is true thenNow checking,if(C>10 ? A>5 ? NULL : 1 : 2) Here, C>10 that is 20>10 condition is true then check A>5 that is 15>5 condition is again true then it returns NULL, and the value of NULL is 0 and then if statement will be false. Then the else part will be executed and will print "222" on the console screen.

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翻譯自: https://www.includehelp.com/cpp-tutorial/conditional-statements-find-output-programs-set-1.aspx

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