I have no idea why.
The lines it's skipping is the system("PAUSE");.
Not the first two but the last two.
#include <stdlib.h>
#include <stdio.h>
int main()
{
char Big, Small;
Big='Z';
Small='z';
printf("Z=%d.\nz=%d.\n",Big,Small);
system("PAUSE");
int X,Y;
X=72;
Y=104;
printf("74=%c.\n104=%c.\n",X,Y);
system("PAUSE");
double DblNum = 123.456;
printf("f=%f.\nScientific=%e.\ntestF=%F.\n",DblNum,DblNum,DblNum);
system("PAUSE");
char Newline = '\n';
printf("newline=%d.\n",Newline);
system("PAUSE");
return 0;
}