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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	// 如果f(x) = ax平方 + bx + c = 0有重根則輸出0，有兩相異實根輸出1，兩相異虛根輸出-1。 
  5. 	int a,b,c,output;
  6. 	scanf("%d",&a);
  7. 	scanf("%d",&b);
  8. 	scanf("%d",&c);
  9. 	//判別式：b*b-4ac
  10. 	if(b*b-4*a*c==0)//重根＝0
  11. 	output=0;
  12. 	else if(b*b-4*a*c>0)//實根>0
  13. 	output=1;
  14. 	else if(b*b-4*a*c<0)//虛根<0
  15. 	output=-1;
  16. 	else 
  17. 	output=-999;
  18. 	if(a*b*c==0)
  19. 	output=-666;
  20.  
  21. 	printf("%d\n",output);
  22.  
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5460KB
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-1
https://ideone.com/8buWfB
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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