I can't understand how it work , can anyone describe every steps?

Question

#include <stdio.h>

main()
{ int i,j,a[][3]={1,2,3,4,5,6,7,8,9};
for(i=0;i<3;i++)
for(j=i+1;j<3;j++) a[j][i]=0;
for(i=0;i<3;i++)
{ for(j=0;j<3;j++) printf("%d ",a[i][j]);
printf("\n");
}
}

Answer 1

use the open and closing curly bracket when writing for, while, if that was the problem in you other post, since your a beginner use em always, and put your code on code playground then link it here, not every use will like to read an unformatted code