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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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