求3行3列矩陣a[3][3]={1,2,3,4,5,6,7,8,9}非對角線上元素之和。

#include <stdio.h> int main() { int a[3][3]={1,2,3,4,5,6,7,8,9,}; int b[3]; int sum=0; for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { if(i==j) {continue;} else {sum

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