C++ :

#include<stdio.h>

int main()
{
	int sh,sm,fh,fm,SM,FM,pass;
	puts("Initial time  Final time  Passes");
	while(scanf("%d%d%d%d",&sh,&sm,&fh,&fm)!=EOF)
	{
		SM=(sh%12)*60+sm;
		FM=(fh%12)*60+fm;
		pass=(int)(FM/720.0*11)-(int)(SM/720.0*11);
		if(SM>FM)
			pass+=11;
		printf("       %02d:%02d       %02d:%02d%8d\n",sh,sm,fh,fm,pass);
	}
	return 0;
}