题目内容

下面程序可求出矩阵两条对角线上的元素之和。请分析程序填空。main(){int a[3][3]= {1,3,6,7,9,11,14,15,17},sum1=0,sum2=0,i,j;for(i=0; i<3; i++)for(j=0; j<3; j++)if(i==j) sum1+=a[i][j];for(i=0; i<3; i++)for(【1】; 【2】; j--)if(i+j==2) sum2+=a[i][j];printf("sum1=%d,sum2=%d\n",sum1,sum2);}

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