编写程序,计算下面4*4二维数组的两条对角线上的元素之和答:include <stdio.h> void main(){ int a[4][4]={45,30,26,48,55,20,17,39,41,25,19,22,31,18,22,10};int i,j,sum;sum = 0;for(i=0;i<4;i++)for(j=0;j<4;j++){ if(i==j || i+j==3)sum = sum+a[i][j];} printf("%d\n",sum);} VB Private Sub ...