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//program to initialize 3x3 matrix and display upper and lower triangle of the matrix (example of double dimensional arrays) #include<iostream.h> #include<conio.h> void main() { int a[3][3]={ 1,2,3, 4,5,6, 7,8,9 }; int i,j; clrscr(); cout<<"\ndisplaying the matrix\n"; for(i=0;i<3;i++) { for(j=0;j<3;j++) { cout<<a[i][j]<<"\t"; } cout<<"\n"; } cout<<"\ndisplaying upper triangle\n"; for(i=0;i<3;i++) { for(j=0;j<3;j++) { if(j>=i) { cout<<a[i][j]<<"\t"; } } cout<<"\n"; } cout<<"\ndisplaying lower triangle\n"; for(i=0;i<3;i++) { for(j=0;j<3;j++) { if(j<=i) { cout<<a[i][j]<<"\t"; } } cout<<"\n"; } getch(); }