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May 19th, 2019
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  1. #include<stdio.h>
  2. int main(){
  3. int n,i;
  4. int s=0, p=1;
  5. printf("S(n)=1+1.2+1.2.3+...+1.2.3...n\n");
  6. do{
  7. printf("n = ");
  8. scanf("%d",&n);
  9. } while ( n<=0);
  10. for (i=1; i<=n; i++){
  11. p*=i;
  12. s+=p;
  13. }
  14. printf("S(%d) = %d",n,s);
  15.  
  16. return 0;
  17. }
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