squareMatrix_to_spiral_sequence.c

#include<stdio.h>
#define p printf
i,j,a[99][99],n,t,di=1,dj=1,f,l;
int main() {
    p("Enter n of a square matrix:");scanf("%d",&n);t=(l=n);p("\n");
    for(i=j=0;i<n;a[i][j]=i*n+j+1,(++j-n)?0:(j=0,i++));
    for(i=j=0;i<n;(++j-n)?0:(j=0,i++,p("\n")))p("%d\t",a[i][j]);
    p("\nsequence: ");
    for(i=j=0;l;p("%d,",a[i][j]),--t?0:(di*=1-2*f,dj*=2*f-1,t=l-=f=!f),i+=di*f,j+=dj*!f);
    return 0;
}