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  1. #include <stdio.h>
  2.  
  3. m;f(char*s){for(m=sqrt(strlen(s));*s;s+=m)printf("%.*s\n",m,s);}
  4.  
  5. int main(void) {
  6. f("Hi, world");
  7. puts("");
  8. f("Hi, world! Hello");
  9. puts("");
  10. f("H");
  11. return 0;
  12. }
  13.  
Success #stdin #stdout 0s 2156KB
stdin
Standard input is empty
stdout
Hi,
 wo
rld

Hi, 
worl
d! H
ello

H