第3章循环结构程序设计练习

#include <iostream>using namespace std; int main()  {     char c1,c2;     for(c1='0',c2='9';c1<c2;c1++,c2--)  {  cout<<c1<<c2;         cout<<endl ;}return 0;  }

输出结果

 

#include <iostream>using namespace std; int main ( )  {        int  i, j, s=0;      for (i=1; i<=4; i++)      {          for( j=1; j<=i; j++)              s=s+1;      }      cout<<"s="<<s<<endl;      return  0;  }

输出：s=10

#include <iostream>using namespace std; int  main()    { int number=729,digit;  do  {      digit=number%10;  //取余    number=number/10;  //取模    cout<<digit<<"  "<<number;cout<<endl;} while(number>0);   return 0;