Use array name as function parameter

The main function to initialize a two-dimensional array represents a matrix array, and each element is output, and then call sub-
function was calculated and the elements of each row, and will be directly stored in the first element of each row , After returning to the main function, the sum
of the elements in each row is output.

#include <iostream>

using namespace std;

void rowSum(int a[][4], int nRow)
{
    
    
    for (int i = 0; i < nRow; i++)
    {
    
    
        for(int j = 1; j < 4; j++)
            a[i][0] += a[i][j];
    }
}
int main()  
{
    
    
    //定义并初始化数组
    int table[3][4] = {
    
    {
    
    1, 2, 3, 4}, {
    
    2, 3, 4, 5}, {
    
    3, 4, 5, 6}};

    //输出数组元素
    for (int i = 0; i < 3; i++)
    {
    
    
        for (int j = 0; j < 4; j++)
            cout << table[i][j] << "   ";
        cout << endl;
    }
    rowSum(table, 3);  //调用子函数，计算各行和
    //输出计算结果

    for (int i = 0; i < 3; i++)
        cout << "Sum of row " << i << " is " << table[i][0] << endl;
    return 0;
}