計算機等級考試三級機試C語言編程詳細(xì)解析七、數(shù)學(xué)計算[1]

七、其他數(shù)學(xué)計算
    請編制函數(shù)READDAT()實現(xiàn)從文件IN.DAT中讀取1000個十進制整數(shù)到數(shù)組XX中;再編制函數(shù)COMPUTE()分別計算出XX中奇數(shù)的個數(shù)ODD,偶數(shù)的個數(shù)EVEN,平均值`AVER以及方差TOTFE的值,最后調(diào)用函數(shù)WRITEDAT()把結(jié)果輸出到OUT.DAT文件中.
    計算方差的公式如下:
    原始數(shù)據(jù)文件存放的格式是:每行存放10個數(shù),并用逗號隔開(每個數(shù)均大于0且小于等于2000).
    #include
    #include
    #include
    #define MAX 1000
    int xx[MAX],odd=0,even=0;
    double aver=0.0,totfc=0.0;
    void WriteDat(void) ;
    int ReadDat(void)
    {
    FILE *fp ;
    if((fp=fopen("in.dat","r"))==NULL) return 1;
    fclose(fp) ;
    return 0 ;
    }
    void Compute(void)
    {
    }
    void main()
    {
    int i ;
    for(i=0;ixx[i]=0;
    if(ReadDat())
    {printf("Can't open the data file in.dat!\007\n") ;
    return;
    }
    Compute();
    printf("ODD=%d\nEVEN=%d\nAVER=%lf\nTOTFC=%lf\n", odd,even,aver,t
    otfc);
    WriteDat();
    }
    void WriteDat(void)
    {
    FILE *fp;
    int i;
    fp=fopen("out.dat", "w") ;
    fprintf(fp, "%d\n%d\n%lf\n%lf\n",odd,even,aver,totfc);
    fclose(fp) ;
    }
    /* 注：*/
    int ReadDat(void)