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问个_sprintf的含义

2011-03-29 04:11:30 339 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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一步步教你离线安装vsftpd并配置FTP服务在安装vsftpd之前，需确保系统更新至最新版本，并检查防火墙配置以允许FTP流量。安装过程涉及使用包管理器（如apt-get或yum）下载vsftpd及其依赖包，特别是在离线环境中，需先下载所有相关包并传输到目标机器。安装完成后，通过命令验证安装并启动服务。配置vsftpd包括编辑配置文件以设置访问权限和安全性参数，如匿名访问和本地用户访问。此外，需配置防火墙开放FTP端口，并通过FTP客户端测试服务。最后，建议进行安全配置，如禁用匿名访问和配置SSL/TLS加密，并设置日志记录以监控服务状态。阅读详情

下面这段代码啥意思？从别的程序看到的
_sprintf(buf, "| %-*.*s", (int)width, (int)width, name);
我看不懂

...全文

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切换为时间正序

赵4老师 2011-03-29

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比如这个：

//Round(1.234,2) = 1.23

//Round(1.234,0) = 1.0

//Round(123.4,-1) = 120.0

double Round(double dVal, short iPlaces) {

    double dRetval;

    double dMod = 0.0000001;

    if (dVal<0.0) dMod=-0.0000001;

    dRetval=dVal;

    dRetval+=(5.0/pow(10.0,iPlaces+1.0));

    dRetval*=pow(10.0,iPlaces);

    dRetval=floor(dRetval+dMod);

    dRetval/=pow(10.0,iPlaces);

    return(dRetval);

}



double round(double dVal, short iPlaces) //iPlaces>=0

{

    unsigned char s[20];

    double dRetval;



    sprintf(s,"%.*lf",iPlaces,dVal);

    sscanf(s,"%lf",&dRetval);

    return (dRetval);

}

CSDN不许连续同一个作者三次以上回同一个帖子！
只好借宝地一用了。
参考这个帖子：
http://topic.csdn.net/u/20110328/16/60b54ece-510e-4480-b50a-5c4fe32b59d6.html
闲来无事，整了个采用类似画图算法版本的。拜托坛主和楼主不用给分也别删啊。

//c语言编程.任意输入一个数字N(1<=N<=18)，打印一个N*N的矩阵，这个矩阵最外圈为1，每往内一圈，数字加1。

#include <stdio.h>

#include <stdlib.h>

char M[19][19];

int N,n,y,x,i,k;

void main() {

    while (1) {

        printf("\nInput N(1..18):");

        if (1==scanf("%d",&N)) {

            if (1<=N && N<=18) break;

        }

    }

    //为测试1～18结果的正确性，忽略输入的N。

    for (n=1;n<=18;n++) {

        printf("------%d-------\n",n);

        for (i=1;i<=n;i++) {

            y=i    ;for (x=i;x<=n+1-i;x++) M[y][x]=i;

            y=n+1-i;for (x=i;x<=n+1-i;x++) M[y][x]=i;

            x=i    ;for (y=i;y<=n+1-i;y++) M[y][x]=i;

            x=n+1-i;for (y=i;y<=n+1-i;y++) M[y][x]=i;

        }

        for (y=1;y<=n;y++) {

            for (x=1;x<=n;x++) {

                printf("%d",M[y][x]);

            }

            printf("\n");

        }

    }

}

//

//Input N(1..18):1

//------1-------

//1

//------2-------

//11

//11

//------3-------

//111

//121

//111

//------4-------

//1111

//1221

//1221

//1111

//------5-------

//11111

//12221

//12321

//12221

//11111

//------6-------

//111111

//122221

//123321

//123321

//122221

//111111

//------7-------

//1111111

//1222221

//1233321

//1234321

//1233321

//1222221

//1111111

//------8-------

//11111111

//12222221

//12333321

//12344321

//12344321

//12333321

//12222221

//11111111

//------9-------

//111111111

//122222221

//123333321

//123444321

//123454321

//123444321

//123333321

//122222221

//111111111

//------10-------

//1111111111

//1222222221

//1233333321

//1234444321

//1234554321

//1234554321

//1234444321

//1233333321

//1222222221

//1111111111

//------11-------

//11111111111

//12222222221

//12333333321

//12344444321

//12345554321

//12345654321

//12345554321

//12344444321

//12333333321

//12222222221

//11111111111

//------12-------

//111111111111

//122222222221

//123333333321

//123444444321

//123455554321

//123456654321

//123456654321

//123455554321

//123444444321

//123333333321

//122222222221

//111111111111

//------13-------

//1111111111111

//1222222222221

//1233333333321

//1234444444321

//1234555554321

//1234566654321

//1234567654321

//1234566654321

//1234555554321

//1234444444321

//1233333333321

//1222222222221

//1111111111111

//------14-------

//11111111111111

//12222222222221

//12333333333321

//12344444444321

//12345555554321

//12345666654321

//12345677654321

//12345677654321

//12345666654321

//12345555554321

//12344444444321

//12333333333321

//12222222222221

//11111111111111

//------15-------

//111111111111111

//122222222222221

//123333333333321

//123444444444321

//123455555554321

//123456666654321

//123456777654321

//123456787654321

//123456777654321

//123456666654321

//123455555554321

//123444444444321

//123333333333321

//122222222222221

//111111111111111

//------16-------

//1111111111111111

//1222222222222221

//1233333333333321

//1234444444444321

//1234555555554321

//1234566666654321

//1234567777654321

//1234567887654321

//1234567887654321

//1234567777654321

//1234566666654321

//1234555555554321

//1234444444444321

//1233333333333321

//1222222222222221

//1111111111111111

//------17-------

//11111111111111111

//12222222222222221

//12333333333333321

//12344444444444321

//12345555555554321

//12345666666654321

//12345677777654321

//12345678887654321

//12345678987654321

//12345678887654321

//12345677777654321

//12345666666654321

//12345555555554321

//12344444444444321

//12333333333333321

//12222222222222221

//11111111111111111

//------18-------

//111111111111111111

//122222222222222221

//123333333333333321

//123444444444444321

//123455555555554321

//123456666666654321

//123456777777654321

//123456788887654321

//123456789987654321

//123456789987654321

//123456788887654321

//123456777777654321

//123456666666654321

//123455555555554321

//123444444444444321

//123333333333333321

//122222222222222221

//111111111111111111

luciferisnotsatan 2011-03-29

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转换后也就是

假设width为2，那么这个格式也就变成了
%-2.2s

实践是最好的学习 2011-03-29

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看到了，谢谢

luciferisnotsatan 2011-03-29

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msdn里

Format Specification Fields: printf and wprintf Functions
...
A format specification, which consists of optional and required fields, has the following form:
%[flags] [width] [.precision] [{h | l | ll | I | I32 | I64}]type

width和precision的解释里有
If the width specification is an asterisk (*), an int argument from the argument list supplies the value. The width argument must precede the value being formatted in the argument list. A nonexistent or small field width does not cause the truncation of a field; if the result of a conversion is wider than the field width, the field expands to contain the conversion result.

If the precision specification is an asterisk (*), an int argument from the argument list supplies the value. The precision argument must precede the value being formatted in the argument list.

- . s 这些应该知道的吧

实践是最好的学习 2011-03-29