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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(void) 
  5. {
  6. 	int n,i=1,sum=0;
  7. 	do
  8. 	{
  9. 		scanf("%d",&n);
  10. 		printf("輸入n(n>0):%d\n",n);
  11. 	}
  12. 	while(n<=0);
  13.  
  14. 	do
  15. 	sum+=i++;
  16. 	while(i<=n);
  17. 	printf("1+2+.....+n=%d",sum);
  18.  
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5268KB
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stdin
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10
stdout
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輸入n(n>0):10
1+2+.....+n=55
https://ideone.com/FWrRUN
1+2+3....n
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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