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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int QuadFormula(double a, double b, double c){
  5. 	double D = (b*b - 4*a*c);
  6. 	double x1, x2, x3 ,x4;
  7. 	x1 = ((-b + sqrt(D)) / (2*a));
  8. 	x2 = ((-b - sqrt(D)) / (2*a));
  9. 	x3 = (-b /(2*a));
  10. 	x4 = (sqrt(-D) / (2*a));
  11. 	if(a == 0){
  12. 		printf("計算できません。");
  13. 	}else if(D > 0){
  14. 		printf("解は%lf,%lfです。\n",x1,x2);
  15. 	}else if(D == 0){
  16. 		printf("解は%lfです。\n",x1);
  17. 	}else{
  18. 	    printf("解は%lf+i%lf,%lf-i%lfです。\n",x3,x4,x3,x4);
  19.     }
  20.     return 0;
  21. }
  22. int main(void) {
  23. 	 double a, b, c;
  24. 	 printf("aの値:\n");
  25. 	 scanf("%lf",&a);
  26. 	 printf("bの値:\n");
  27. 	 scanf("%lf",&b);
  28. 	 printf("cの値:\n");
  29. 	 scanf("%lf",&c);
  30.  
  31. 	 QuadFormula(a,b,c);
  32. return 0;
  33. }
  34.  
Success #stdin #stdout 0.01s 5276KB
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aの値:
bの値:
cの値:
解は2.000000です。
https://ideone.com/2miPKQ
language:
C++ (gcc 8.3)
created:
6 hours ago
visibility:
public

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