C++ a Function return a array 函数返回一组数组

https://blog.csdn.net/lijiayu2015/article/details/52821562

1. Dynamically allocated memory within a function

float* add(float a[3], float b[3])
{
    float* sum=new float[3];//替换
    sum[0] = a[0] + b[0];
    sum[1] = a[1] + b[1];
    sum[2] = a[2] + b[2];
    return sum;
}

int main()
{
    float A[3] = { 1, 1, 1};
    float B[3] = { 1, 2,3};
    float *M = add(A, B);
    cout << M[0] << " " << M[1] << "  "<<M[2]<<endl;
    cout << M[0] << " " << M[1] << "  " << M[2] << endl;
    delete[] M;//增加
    system("pause");
    return 0;
}

2. Define the array outside the function, pass the function through the parameters, and modify the array inside the function

void add(float a[3], float b[3],float sum[3])
{
    sum[0] = a[0] + b[0];
    sum[1] = a[1] + b[1];
    sum[2] = a[2] + b[2];
}

int main()
{
    float A[3] = { 1, 1, 1};
    float B[3] = { 1, 2,3};
    float M[3];
    add(A, B, M);
    cout << M[0] << " " << M[1] << "  "<<M[2]<<endl;
    cout << M[0] << " " << M[1] << "  " << M[2] << endl;
    system("pause");
    return 0;
}