C语言实验.输入一个3行4列二维数组,计算靠边元素值的和.答:include <stdio.h> include <stdlib.h> int main(){ int a[3][4]={1,2,3,4,5,6,7,8,9,10,11,12};int sum=0,j;for(j=0;j<4;j++) sum+=a[0][j];sum+=a[1][0];sum+=a[1][3];for(j=0;j<4;j++) sum+=a[2][j];printf("sum=%d\n",sum);system...