求主次对角线之和。 main {static int a[ ][3]={9,7,5,1,2,4,6,8}; int I,j,s1=0,s2=0; for(I=

求主次对角线之和。 main {static int a[ ][3]={9,7,5,1,2,4,6,8}; int I,j,s1=0,s2=0; for(I=0;I<3;I++) for(j=0;j<3;j++) {if(__________) s1=s1+a[I][j]; if( __________ ) s2=s2+a[I][j]; } printf(“%d\n%d\n”,s1,s2); }