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  1. #include<stdio.h>
  2.  
  3. int main() {
  4. 	int a,b;
  5. 	int sum=0;
  6. 	scanf("%d%d",&a,&b);
  7. 	a=a+(a%2);
  8. 	b=b-(b%2);
  9. 	for(int i=a;i<=b;i+=2){
  10. 			sum+=i;
  11. 	}
  12. 	printf("%d",sum);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5320KB
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stdin
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2 5
stdout
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6
https://ideone.com/gGrft2
我也愛偶數（試著不用 if-else）
language:
C (gcc 8.3)
created:
23 hours ago
visibility:
public

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