复杂点

摄氏度撒打算大时代2

1. #include<stdio.h>
   
2. int summation(int n)
   
3. {int i,sum;
   
4. for (i=1,sum=0;i<=n;i++)
   
5. {sum+=i;
   
6. }
   
7. return sum;
   
8. }
   
9. main()
   
10. {int sum;
    
11. int n;
    
12. n=100;
    
13. sum=summation(n);
    
14. printf ("1+2+...+100=%d",sum);
    
15. }

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