IT博客-射手的博客-随笔分类-C语言的学习

C++ primer 习题1.9-1.13

Archer — Tue, 11 May 2010 11:14:00 GMT

#include <iostream>
int main()
  {
  1.9 /*    int sum = 0;
      for(int i = -100;i <= 100;i++)
      sum +=i;
      std::cout << sum;

  1.10  {* for() 50-100 natural number sum *}
      int sum = 0 ;
      for(int i =50 ;i <=100; i++)
       sum += i;
       std::cout << sum <
  1.10 {* while  50-100 natural number sum *}
      int  sumA =0, i=50;
      while(i <= 100)
      {
         sumA += i ;
         i++;
      }
        std::cout << sumA <   */
  1.11  // {* while output 10 -0*}
     int i=10;
     while (0 <=i)
       {
           std::cout << i <<std::endl;
           i--;
       }
  1.11  // {* for() output 10-0 *}
       for(int i=10 ; 0 <=i ; i--)
        std::cout << i << std::endl;
  }

Archer 2010-05-11 19:14 发表评论

一段用指针排序的代码

Archer — Tue, 19 May 2009 15:51:00 GMT

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    int score[5],*PointerScore = score;
    int i,j,temp;
    for(i=0;i<5;i++)
     scanf("%d",&score[i]);
    for(i=0;i<5;i++)
     for(j=i+1;j<5;j++)
      if  (* (PointerScore+i) < *(PointerScore+j) )
       {
         temp = *(PointerScore+j);
        *(PointerScore+j) = *(PointerScore+i);
        *(PointerScore+i) = temp;
        }
         printf("排列:");
    for(i=0;i<5;i++)
     printf("%d \n",score[i]);
    system("PAUSE");
    return EXIT_SUCCESS;
}

Archer 2009-05-19 23:51 发表评论

初学结构类型_写的学生管理.

Archer — Mon, 18 May 2009 15:07:00 GMT

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



int main(int argc, char *argv[])
{
         struct Student
     {
      int  No;
      char *Name;
      char Sex;
      float Score;
     };
     int i;
     struct Student Stu[3] =
     {
       {10,"LiPing",'M',800.5},
       {11,"Wang Pan",'F',400.5}, // 性别注意是字符要用 ' ' 扩住初始化
       {12,"Archer",'M',1000.5} //注意最后一个结构体变量初始后不要加","号
       };
    for(i=0;i<3;i++)
     {
      printf("No = %d ,Name = %s,Sex = %c,Score = %6.1f \n",
      Stu[i].No , Stu[i].Name , Stu[i].Sex , Stu[i].Score);
     }
    system("PAUSE");
    return EXIT_SUCCESS;
}

Archer 2009-05-18 23:07 发表评论

C 一个判断奇数最高效的方法

Archer — Tue, 05 May 2009 15:57:00 GMT

int judge_number(int i_val)
{
if (i_val&1)
    return 1;//奇数
else
    return 0;//偶数
}
比如

最后一位是1,则位奇数.
i_val & 1 与运算,如果返回为1,则为奇数
判断二进制位,
if语句在非0情况下执行语句一,
   在0的情况下执行语句2.

Archer 2009-05-05 23:57 发表评论

C语言.计算输入整数分别各位的值.

Archer — Fri, 24 Apr 2009 05:32:00 GMT

#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
    int Value,a1,a2,a3,a4;
    printf("Enter Value: \t ");
    scanf("%d",&Value);
    a1 = Value/1000; //得到千位数
        a2 = Value/100 %10; //得到百位数比如1200/100=12%10=2;
        a3 = Value /10 %10; //得到十位数比如1200 / 10 =120 % 10 = 0 ;
        a4 =Value % 10; //得到个位数      比如1200 %10 =0
    printf("a1 = %d,a2 = %d,a3 = %d,a4 = %d",a1,a2,a3,a4);

}

Archer 2009-04-24 13:32 发表评论

学习C语言的,第一个小程序

Archer — Mon, 20 Apr 2009 04:36:00 GMT

C语言与Delphi相比没有那么严格的语法, 可读性感觉没有Delphi强,代码清晰需要看自己的写法.
C语言是一个大小写识别的语言.所以在很多地方需要注意.

1main()
2{
3  int Value,ValueA,Sum;
4  printf("Please enter the digital \n");
5  printf("Please enter Value  ");
6  scanf("%d",&Value);
7  printf("Please enter ValueA  ");
8  scanf("%d",&ValueA);
9  Sum = Value+ValueA;
10  printf("Value =%d , ValueA =%d ,Sum = %d \n",Value,ValueA,Sum);
11  printf("MaxValue This %d",Max(Value,ValueA));
12  getch();
13}
14int Max (int Value, int ValueA) /*自定义函数*/
15{
16    int ValueCmp;
17    if (Value > ValueA)
18     ValueCmp = Value;
19    else
20     ValueCmp =ValueA;
21      return(ValueCmp);
22}

Archer 2009-04-20 12:36 发表评论