2 回答i%2==0&&j%2==0

2 回答if((i+j)%2==0)

1 回答6-11 if(i%2==0&&j%2==0)

1 回答为什么要if(i%2==0&&j%==0

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