Prints a complete multiplication-table in C language, which came out of nowhere under the strong sunlight in a summer day when all those Pokemon servers Go down.

mul_tbl.c

#include <stdio.h>
#define N 9
main(k){for(k--;k<N*N;k++)printf("%2d%c",(k/N+1)*(k%N+1),(k+1)%N?32:10);}

output.log

$ cc -Wno-main -Wno-implicit-int mul_tbl.c ; ./a.out
 1  2  3  4  5  6  7  8  9
 2  4  6  8 10 12 14 16 18
 3  6  9 12 15 18 21 24 27
 4  8 12 16 20 24 28 32 36
 5 10 15 20 25 30 35 40 45
 6 12 18 24 30 36 42 48 54
 7 14 21 28 35 42 49 56 63
 8 16 24 32 40 48 56 64 72
 9 18 27 36 45 54 63 72 81
$