二元一次方程解法
#include<stdio.h> #include<math.h> #define eps 1e-6 main() { float a,b,c,d; printf("Please enter the coefficients a,b,c:"); scanf("%f,%f,%f",&a,&b,&c); if(a==0) printf("It is not a quadratic equation!\n"); else { d=sqrt(fabs(b*b-4*a*c)); if(fabs(b*b-4*a*c)<eps) printf("x1 = x2 = %.2f\n",(-b+d)/2/a); else if(b*b-4*a*c>eps) printf("x1 = %.2f, x2 = %.2f\n",(-b+d)/2/a,(-b-d)/2/a); else printf("x1 = %.2f+%.2fi, x2 = %.2f-%.2fi\n",-b/2/a ,d/2/a ,-b/2/a ,-d/2/a); } }
注意:在这个程序中,最好不要用pow函数
因为:pow是有精度损失的
计算机没这么聪明,能判断出你的是int型pow,计算机全部当double处理了
pow(2,2) = 3.999999999 pow(2,2) + 0.05 = 4.0499999
eg
for(i=1;i<= (int)(pow(m,1.0/3)+0.05); i++)
附上第一次的麻烦代码:
#include<stdio.h> #include<math.h> #define EPS 1e-6 #include "windows.h" main() { float a,b,c; float d; printf("Please enter the coefficients a,b,c:"); scanf("%f,%f,%f",&a,&b,&c); d=sqrt(b*b-4*a*c); if(a==0) printf("It is not a quadratic equation!\n"); else{ if(b*b-4*a*c==0) printf("x1 = x2 = %.2f\n",(-b+d)/(2*a)); else if(b*b-4*a*c>0) printf("x1 = %.2f, x2 = %.2f\n",(-b+d)/(2*a),(-b-d)/(2*a)); else printf("x1 = %.2f+%.2fi, " "x2 = %.2f-%.2fi\n",-b/(2*a),sqrt(fabs(b*b-4*a*c))/(2*a),-b/(2*a),sqrt(fabs(b*b-4*a*c))/(2*a)); }
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