求方程 的根，用三个函数分别求当b2-4ac大于0、等于0、和小于0时的根，并输出结果。从主函数输入a、b、c的值。...

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#include
#include
void yishigen(float m,float n,float k)  
{
float x1,x2;  
    x1=(-n+(float)sqrt(k))/(2*m);  
    x2=(n-(float)sqrt(k))/(2*m);  
if(x1==x2)
        printf("=%.3f\n",x1);
else
    printf("two shigen is x1=%.3f and x2=%.3f\n",x1,x2);  
}  
void denggen(float m,float n,float k)
{
float x;  
    x=(float)(-n/(2*m));  
    printf("denggen is x=%.3f\n",x);
}  
void xugen(float m,float n,float k)  
{
float x,y;  
    x=(float)n/(2*m);  
    y=(float)sqrt(-k)/(2*m);  
    printf("two xugen is x1=%.3f+%.3fi and x2=%.3f-%.3fi\n",x,y,x,y);  
}  
int main()  
{
float a,b,c,q;  
    printf("input a b c is ");  
    scanf("%f%f%f",&a,&b,&c);
    printf("\n");  
if(a==0)
if(b==0)
if(c=0)
                printf("所有实数");
else
            {printf("wugen\n");return 0;}
else
        {printf("x=%.3f\n",-c/b);return 0;}
    q=b*b-4*a*c;  
if(q>0)
        yishigen(a,b,q);  
else
if(q==0)
            denggen(a,b,q);
else
        xugen(a,b,q) ;
return 0;
}  

2.求方程 的根，用三个函数分别求当b2-4ac大于0、等于0、和小于0时的根，并输出结果。从主函数输入a、b、c的值。 
#include"math.h" 
float yishigen(float  m,n,k) 
{float x1,x2; 
x1=(-n+sqrt(k))/(2*m); 
x2=(n-sqrt(k))/(2*n); 
printf("two shigen is x1=%.3f and x2=%.3f\n",x1,x2); 
} 
float denggen(m,n); 
{float x; 
x=-n/(2*m); 
printf("denggen is x=%.3f\n",x); 
} 
float xugen(m,n,k) 
{float x,y; 
x=n/(2*m); 
y=sqrt(-k)/(2*m); 
printf("two xugen is x1=%.3f+%.3fi and x2=%.3f-%.3fi\n",x,y,x,y); 
} 
main() 
{float a,b,c,q; 
printf("input a b c is "); 
scanf("%f,%f,%f",&a,&b,&c); 
printf("\n"); 
q=b*b+4*a*c; 
if(q<0) yishlgen(a,b,q); 
else if(q=0) donggen(a,b); 
else xugan(a,b,q)
} 

转载于:https://www.cnblogs.com/galczn/archive/2012/02/29/2373960.html