求S=1+2+4+8+***1024

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1. s=a=1;
   
2. for (i=1;i<=10;i++)
   
3. {
   
4.    a=a*2;
   
5.    s=s+a;
   
6. }
   
7. cout<<s;
   
8. 
   
9. s=0;
   
10. for (a=1;a<=1024;a++) s+=a;
    
11. cout<<s;
    

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