175.c

C++游戏开发书籍的实例非常适合初学但又又想往游戏开发方面发展的人学习哦

#include<stdio.h>
#include<conio.h>
#define MAXNUM 200 
int xx[MAXNUM];
int totnum=0;
int totcnt=0;
double totpjz=0.0;
int readdat(void);
void writedat(void);
void calvalue(void)
{
	int i,data;
	for(i=0;i<MAXNUM;i++)
	{
		if(!xx[i]) break;
		if(xx[i]>0) totnum++;
		data=xx[i]>>1;
		if(data%2==0)
		{	
			totcnt++;
			totpjz+=xx[i];
		}
	}
	totpjz/=totcnt;
}
void PressKeyToQuit()
{
	printf("\n Press any key to quit...");
	getch();
	return;
}
void main()
{
	int i;
	clrscr();
	puts(" This program is to execute Bit Shift Operation.");
	puts(" >> Now reading datas from file......Succeeded!");
	puts(" >> Calculating......Completed!");
	puts(" >> Results are:");
	for(i=0;i<MAXNUM;i++) xx[i]=0;
	if(readdat())
	{
		printf(" Can't open the data file in175.dat!\007\n");
		return;
	}
	calvalue();
	printf(" >> The total number of data in the file is %d.\n",totnum);
	printf(" >> The even number of data after bit shift is %d.\n",totcnt);
	printf(" >> The variance of these even numbers is %.2lf\n",totpjz);
	writedat();
	PressKeyToQuit();
}
int readdat(void)
{
	FILE *fp;
	int i=0;
	if((fp=fopen("in175.dat","r"))==NULL) return 1;
	while(!feof(fp))
	fscanf(fp,"%d",&xx[i++]);
	fclose(fp);
	return 0;
}
void writedat(void)
{
	FILE *fp;
	fp=fopen("out175.dat","w");
	fprintf(fp,"%d\n%d\n%.2lf\n",totnum,totcnt,totpjz);
	fclose(fp);
}