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檔案處理問題

adssc 发布于 2020-04-04 17:25， 2319 次点击
題目:
產生 10 個 1 到 64 之間亂數,由小排到大,並寫入純文字檔.txt內.

問題:
寫入進去都連在一起...如何解決 ?
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程序代码：
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<fcntl.h>
#include<io.h>
#include<sys/stat.h>
#include<string.h>

#define SIZE 10

int main()
{
    int f1,i,j,temp;
    int num[SIZE];
    char buffer[SIZE];
    srand(time(NULL));
    f1=open("rand.txt",O_WRONLY|O_CREAT|O_TEXT,S_IWRITE);
    if(f1!=-1)
    {
        for(i=1;i<=SIZE;i++)
        {
            do
            {
                num[i-1]=rand()%64+1;
                for(j=1;j<i;j++)
                {
                    if(num[i-1]==num[j-1])
                    {
                        break;
                    }
                }
            }while(j!=i);
            printf("%2d ",num[i-1]);
        }
        printf("\n");
        i=0,j=0;
        while(i<SIZE-1)
        {
            j=i+1;
            while(j<SIZE)
            {
                if(num[j]<num[i])
                {
                    temp=num[j];
                    num[j]=num[i];
                    num[i]=temp;
                }
                j++;
            }
            i++;
        }
        for(i=0;i<SIZE;i++)
        {
            printf("%2d ",num[i]);
            strcpy(buffer,itoa(num[i],buffer,SIZE));
            write(f1,buffer,strlen(buffer));
        }
        close(f1);
        printf("\n");
    }
    else
        printf("Fali\n");
    system("pause");
    return 0;
}
9 回复
#2
zbjzbj2020-04-04 18:11
用sprintf代替strcpy
#3
lin51616782020-04-04 18:19
加空格啊
#4
forever742020-04-04 19:18
起码可以用strcat向你的buffer尾部加空格吧？
#5
forever742020-04-04 19:24
另外楼主的代码里itoa的第三参数应该是进制，用SIZE表达了，尽管巧合是10，但看着有点牙疼。
#6
adssc2020-04-04 20:09
回复 2楼 zbjzbj
我知道,但該題目含意希望用 write 練習....
#7
adssc2020-04-04 20:09
回复 3楼 lin5161678
我知道
#8
adssc2020-04-04 20:10
回复 5楼 forever74
會改進,因為都剛好 10 ,就順便了哈哈
#9
adssc2020-04-04 20:21
回复 4楼 forever74
不好意思,不行
#10
adssc2020-04-05 14:32
回复 楼主 adssc
已解決
程序代码：
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<fcntl.h>
#include<io.h>
#include<sys/stat.h>

#define SIZE 10

int main()
{
    int f1,i,j,k=0,temp;
    int num[SIZE];
    srand(time(NULL));
    f1=open("rand.txt",O_RDWR|O_CREAT|O_TEXT);
    if(f1!=-1)
    {
        for(i=0;i<SIZE;i++)
        {
            do
            {
                num[i]=rand()%64+1;
                for(j=0;j<i;j++)
                {
                    if(num[i]==num[j])
                    {
                        break;
                    }
                }
            }while(j!=i);
            if(i==0)
                printf("%2d",num[0]);
            else
                printf(",%2d",num[i]);
        }
        printf("\n");
        i=0,j=0;
        while(i<SIZE-1)
        {
            j=i+1;
            while(j<SIZE)
            {
                if(num[j]<num[i])
                {
                    temp=num[j];
                    num[j]=num[i];
                    num[i]=temp;
                }
                j++;
            }
            i++;
        }
        for(i=0;i<SIZE;i++)
        {
            if(i==0)
                printf("%2d",num[0]);
            else
                printf(",%2d",num[i]);
        }
        write(f1,num,sizeof(num));
        close(f1);
        printf("\n");
    }
    else
        printf("Fali\n");
    system("pause");
    return 0;
}
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