gen.c

来自「写一个程序」· C语言 代码 · 共 25 行

#include<stdio.h>
#include<math.h>
main()
{
    float a,b,c,delta,twoa,term1,term2;
    printf("enter a,b,c:");
    scanf("%f%f%f",&a,&b,&c);
    if (a=0)
        if(b=0)
            printf("no answer due to input error!\n");
        else
            printf("the single root is %f\n",-c/b);
    else
    {
        delta=b*b-c*a*c;
        twoa=2*a;
        term1=-b/twoa;
        term2=sqrt(abs(delta))/twoa;
        if (delta<0)
            printf("complex roots\n real part=%f image part=%f\n",term1,term2);
        else
            printf("real roots\n root1=%f root2=%f\n",term1=term2,term1-term2);
    }
}