/* C program for addition/multiplication tables mod N */

#define N 26

#define Letter(i) ( (char)(i)+'A' )

main()
{
int i,j;

printf("Addition and Multiplication Tables Mod N = %d\n",N);

for (i=0;i<N;i++) printf("%-3d",i); printf("\n");
for (i=0;i<N;i++) printf("%-3c",Letter(i)); printf("\n");

printf("\n\n");

for (i=0;i<N;i++) {
    for (j=0;j<N;j++) {
        printf("%-3d",(i+j)%N);
        }
    printf("\n");
    }
printf("\n\n");

for (i=0;i<N;i++) {
    for (j=0;j<N;j++) {
        printf("%-3d",(i*j)%N);
        }
    printf("\n");
    }

}