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C++上課筆記(5)

查理 | 2013-12-12 19:53:59 | 巴幣 0 | 人氣 250

#include <iostream>

using namespace std;

int main()

{

char c[20];

cout<<"input string:";

cin>>c;

cout<<c<<endl;

system("pause");

return 0;

}

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字串長度

strlen(字串)

字串比較

strcmp(字串1,字串2)

#include <iostream>

using namespace std;

int main()

{

char str1[]={'d','e','v','_','c','+','+','\0'};

char str2[]="dEv_c++";

cout<<str1<<endl;

cout<<str2<<endl;

int i;

for(i=0;i<strlen(str1);i++)

cout<<str1[i]<<endl;

cout<<strcmp(str1,str2)<<endl;

if( strcmp(str1,str2)==0)

cout<<"相同"<<endl;

else

cout<<"不相同"<<endl;

// if(str1==str2)

system("pause");

return 0;

}

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小寫轉大寫

#include <iostream>

using namespace std;

int main()

{

char str[20];

cout<<"input string";

cin>>str;

int i=0;

while(str[i]!='\0')

{

if(str[i]>=97&&str[i]<=122)

str[i]-=32;

i++;

}

cout<<str<<endl;

system("pause");

return 0;

}

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反向列印

#include <iostream>

using namespace std;

int main()

{

char str[20];

cout<<"input string";

cin>>str;

int i;

for(i=strlen(str)-1;i>=0;i--)

cout<<str[i];

cout<<endl;

system("pause");

return 0;

}

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輸入密碼正確列印welcome 錯誤列印 error 有三次機會

#include <iostream>

using namespace std;

int main()

{

char pwd[]="abc123";

char pass[20];

int i;

for(i=1;i<=3;i++)

{

cout<<"輸入密碼:";

cin>>pass;

if(strcmp(pwd,pass)==0)

{

cout<<"welcome"<<endl;

break;

}

else

{

cout<<"error"<<endl;

}

system("pause");

return 0;

}

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二維陣列

#include <iostream>
using namespace std;
int main()
{
   char a[3][4];
   int i,j;
   for(i=0;i<3;i++)
   {
     for(j=0;j<4;j++)
     {
        a[i][j]=i+j;
        cout<<a[i][j]<<" ";
     }
     cout<<endl;

   }

   system("pause");
   return 0;
}

------------------------------------------------------------------------

二維陣列相加

#include <iostream>
using namespace std;
int main()
{
   int a[][3]={{2,6,1},{-1,-2,5},{3,5,4}};
   int b[3][3]={{-1,-3,3},{0,5,-1},{1,-3,-2}};
   int c[3][3];
   int i,j;
   for(i=0;i<3;i++)
   {
      for(j=0;j<3;j++)
      {
         c[i][j]=a[i][j]+b[i][j];
         cout<<c[i][j]<<" ";
      }
      cout<<endl;
   }

   system("pause");
   return 0;
}

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陣列購買課程

#include <iostream>

using namespace std;

int main()

{

char acc[][20]={"andy","sen","charlie","tom};

int point[4]={30,60,45,100}

int course[4]={0,50,100,40};

char user[20];

cout<<"帳號:";

cin>>user;