#include<iostream> using namespace std; void main() { int a=10,b=20,&c=a; int *p=&c; cout<<"a="<<a<<",b="<<b<<",c="<<c<<endl; *p=*p+1; b=a+100; cout<<"a="<<a<<",b="<<b<<",c="<<c<<endl; }
时间: 2023-10-30 13:33:40 浏览: 123
这段代码有一个错误,`void main()` 应该改为 `int main()`,因为在 C++ 中,main 函数必须有返回值。
正确的代码如下:
```c++
#include <iostream>
using namespace std;
int main() {
int a = 10, b = 20, &c = a;
int *p = &c;
cout << "a=" << a << ",b=" << b << ",c=" << c << endl;
*p = *p + 1;
b = a + 100;
cout << "a=" << a << ",b=" << b << ",c=" << c << endl;
return 0;
}
```
输出结果为:
```
a=10,b=20,c=10
a=11,b=111,c=11
```
希望能够帮助到你!
相关问题
#include <iostream> using namespace std; int a=10,b=20; int main(){ cout<<swap(a,b); return 0; }
你的代码中有一个小问题。C++ 中的 swap 函数没有返回值,因此在 `cout<<swap(a,b);` 这行代码中使用了一个无效的输出。如果你想输出交换后的值,你可以修改代码如下:
```cpp
#include <iostream>
using namespace std;
void swap(int& a, int& b) {
int temp = a;
a = b;
b = temp;
}
int main() {
int a = 10;
int b = 20;
swap(a, b);
cout << "a: " << a << endl;
cout << "b: " << b << endl;
return 0;
}
```
这段代码将会输出:
```
a: 20
b: 10
```
这样你就可以看到 `swap` 函数成功交换了 `a` 和 `b` 的值。请注意,我们在 `main` 函数中重新定义了 `a` 和 `b`,这样就不会与全局变量冲突。
#include <iostream>#include <ctime>#include <cstdlib>using namespace std;const int MAXN = 500; // 需要排序的数组大小const int MAXV = 2000; // 随机数的最大值// 直接插入排序void insertSort(int a[], int
Sure, I can help you with that. The code you provided is written in C++ and it seems to be implementing the insertion sort algorithm. Insertion sort is a simple sorting algorithm that works by repeatedly inserting elements into a sorted portion of the array.
Here's the complete implementation of the insertion sort algorithm based on the code you provided:
```cpp
#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
const int MAXN = 500; // Size of the array to be sorted
const int MAXV = 2000; // Maximum value for random numbers
// Function to generate random numbers
void generateRandomArray(int a[], int n) {
srand(time(0));
for (int i = 0; i < n; i++) {
a[i] = rand() % MAXV;
}
}
// Function to print the array
void printArray(int a[], int n) {
for (int i = 0; i < n; i++) {
cout << a[i] << " ";
}
cout << endl;
}
// Insertion sort implementation
void insertionSort(int a[], int n) {
for (int i = 1; i < n; i++) {
int key = a[i];
int j = i - 1;
while (j >= 0 && a[j] > key) {
a[j + 1] = a[j];
j--;
}
a[j + 1] = key;
}
}
int main() {
int arr[MAXN];
// Generate random array
generateRandomArray(arr, MAXN);
cout << "Original array: ";
printArray(arr, MAXN);
// Sort the array using insertion sort
insertionSort(arr, MAXN);
cout << "Sorted array: ";
printArray(arr, MAXN);
return 0;
}
```
This code generates a random array of size `MAXN` with values ranging from 0 to `MAXV`. It then sorts the array using the insertion sort algorithm and prints the original and sorted arrays.
Let me know if you have any further questions or if there's anything else I can assist you with!
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