# include <stdio.h>. int leap(int year) { if (((year%4==0)&&(year%100!=0))(year%400==0)) return (1); else return (0); } ); year+=1900; for (i=1900;i<year;i++) { for (j=1;j<=12;j++) { data=data%7; if (data==0) week[7]++; else week[data]++; data+=month[j]; if ((j==2)&&(leap(i)==1)) data++; } } fprintf (out,"%d...