jince — Wed, 15 Sep 2010 01:17:00 GMT

摘要: 工作的时候写的一个修改记事本的程序段。记录下代码如下�Q?#include #include #include #include&... 阅读全文

jince 2010-09-15 09:17 发表评论

jince — Tue, 14 Sep 2010 07:59:00 GMT

虽然说求最大值最��值函数在哪个头文件下�q�不是非帔R��要，但是遇到问题的时候我们很快的扑ֈ�~~ MSDN上说在algorithm下，但是出错了，其实�q�两个函数需要包含两个头文�g�?lt;windef.h>文�g�Q�其他的�q�有__min和__max需要包�?lt;stdlib.h>头文件。�?br>

#include <iostream>
#include <windows.h>
#include <stdio.h>
#include <windef.h>
using namespace std;

int main () {
  cout << "max(1,2)==" << max(1,2) << endl;
  cout << "max(2,1)==" << max(2,1) << endl;
  cout << "max('a','z')==" << max('a','z') << endl;
  cout << "max(3.14,2.72)==" << max(3.14,2.72) << endl;

  cout << "max(1,2)==" << __max(1,2) << endl;
  cout << "max(2,1)==" << __max(2,1) << endl;
  cout << "max('a','z')==" << __max('a','z') << endl;
  cout << "max(3.14,2.72)==" << __max(3.14,2.72) << endl;
  return 0;
}

�q�行�l�果如下�Q?br>

jince 2010-09-14 15:59 发表评论

JC1

jince — Tue, 14 Sep 2010 02:06:00 GMT

C语言中的time�Q?br> 代码如下�Q?br>

#include<stdio.h>
#include<time.h>
int main()
{
    time_t timep;
    time(&timep);
    printf("%d\n",gmtime(&timep));
    printf("%s\n",asctime(gmtime(&timep)));
    printf("%s\n",ctime(&timep));
    return 0;
}

数据字节数输出：
代码如下�Q?br>

#include<stdio.h>
int main()
{
    printf("char      %d\n",sizeof(char));
    printf("int       %d\n",sizeof(int));
    printf("short int %d\n",sizeof(short int));
    printf("long int  %d\n",sizeof(long int));
    printf("float     %d\n",sizeof(float));
    printf("double    %d\n",sizeof(double));
    return 0;
}

printf输出格式�Q?br> 代码如下�Q?br>

#include<cstdio>
int main()
{
    //for int
    int i=30122121;
    long i2=309095024;
    short i3=30;
    unsigned i4=2123453;
    printf("%d,%o,%x,%X,%ld,%hd,%u\n",i,i,i,i,i2,i3,i4);//如果是：%l,%h�Q�则输不出结�?nbsp;
    printf("%d,%ld\n",i,i2);//试验不出%ld�?d之间的差别，因�ؓlong�?bytes
    printf("%hd,%hd\n\n\n",i,i3);//试验�?hd�?d之间的差别，因�ؓshort�?bytes

    //for string and char
    char ch1='d';
    unsigned char ch2=160;
    char *str="Hello everyone!";
    printf("%c,%u,%s\n\n\n",ch1,ch2,str);//unsigned char��过128的没有字�W�对�?br>
    //for float and double,unsigned and signed can not be used with double and float
    float fl=2.566545445F;//or 2.566545445f
    double dl=265.5651445;
    long double dl2=2.5654441454;

    //%g没有e格式�Q�默�?位包括小数点前面的数,
    //%f没有e格式�Q�默�?位仅只小数点后面包含6�?br>    //%e采用e格式�Q�默�?位�ؓ转化后的��数点后面的6�?/span>
    printf("%f,%e,%g,%.7f\n",fl,dl,dl,dl);
    printf("%f,%E,%G,%f\n",fl,dl,dl,dl);//%F is wrong
    printf("%.8f,%.10e\n",fl,dl);
    printf("%.8e,%.10f\n\n\n",fl,dl);

    //for point
    int *iP=&i;
    char *iP1=new char;
    void *iP2;//dangerous!
    printf("%p,%p,%p\n\n\n",iP,iP1,iP2);

    //其他知识�Q�负��P��表示左对齐（默认是右寚w��Q�；%6.3�Q?表示宽度�Q?表示�_�ֺ�
    char *s="Hello world!";
    printf(":%s: \n:%10s: \n:%.10s: \n:%-10s: \n:%.15s: \n:%-15s: \n:%15.10s: \n:%-15.10s:\n\n\n",
        s,s,s,s,s,s,s,s);
    double ddd=563.908556444;
    printf(":%g: \n:%10g: \n:%.10g: \n:%-10g: \n:%.15g: \n:%-15g: \n:%15.10g: \n:%-15.10g:\n\n\n",
        ddd,ddd,ddd,ddd,ddd,ddd,ddd,ddd);

    //�q�有一个特�D�的格式%*.* ,�q�两个星��L��值分别由�W�二个和�W�三个参数的值指�?/span>
    printf("%.*s \n", 8, "abcdefgggggg");
    printf("%*.*f   \n", 3,3, 1.25456f);
    return 0;
}

jince 2010-09-14 10:06 发表评论

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JC1