编写c++程序,计算二维数组的每行元素之和,每列元素之和,对角线元素之和...答:int sum=0;for(int i=0,j=COLUMN-1;i<LINE,j>=0;++i,--j){ sum+=a[i][j];} cout<<sum<<endl;} int main(int argc,char **argv){ int a[LINE][COLUMN]={1,2,3,4,5,6,7,8,9};cout<<"原二维数组:"<<endl;PrintArray(a);cout<<"每行元素和:"<<endl;AddLine(a)...