C/C++ 指標謎題?
指標是一個儲存另一個變數地址的變數。指標的資料型別與變數的資料型別相同。
在這個謎題中,你需要知道所使用指標的大小。該謎題透過詢問你變數的大小來檢驗你對指標的理解。
int 的大小為 4 位元組,而 int 指標的大小為 8。現在,讓我們用 c++ 程式語言中的以下練習來測試你的技能。
範例
#include <iostream> using namespace std; int main() { int a = 6 ; int *p = &a; int arr[5][8][3]; int *q = &arr[0][0][0]; int ans; cout<<"the value of a is "<<a<<endl; cout<<"predict the size of a "; cin>> ans; if(ans == sizeof(p)) { cout<<"Hurry! your prediction is right"; } else { cout<<"Your Guess is wrong "; } cout<<"Now try this "<<endl; cout<<"arr is a 3D array"<<endl; cout<<"predict the size of arr "; cin>> ans; if(ans == sizeof(q)) { cout<<"Hurry! your prediction is right"; } else { cout<<"Your Guess is wrong "; } return 0; }
輸出
the value of a is 6 predict the size of a 8 Hurry! your prediction is right Now try this arr is a 3D array predict the size of arr 4 Your guess is wrong
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