输入一元二次方程C语言if

#include#includeintmain(void){intrepeat,ri;doublea,b,c,d;scanf("%d",&repeat);for(ri=1;ri=0){printf("

你声明的变量a,b,c都为double,所以用scanf时应用"%lf",还有,你为什么要用do{}while();循环呢,这样,不管你输入了a的值为多少,执行完while(a=0);之后,a的值就为

希望有用,敬请采纳^_^#include#includeintmain(){voidroot2(doublea,doubleb,doubledisc);//定义方程有两个根时的函数voidroot1(

#include"stdio.h"#include"math.h"/*求一元二次方程ax*x+bx+c=0的解*/main(){floata,b,c,x1,x2,d;printf("请输入a：");s

//只一处有错,还有一个注意输入格式.#include#includeintmain(){doublep,q,x1,x2,disc,a,b,c;scanf("%lf,%lf,%lf",&a,&b,&c

intmain()printf("请输入a,b,c");{scanf("%d%d%d",a,b,c);intx1,x2;inty=sqrt(b*b-4*a*c);if(y>0){x1=(-b+y)/2

#include#includeintmain(){inta,b,c,x,p,x1,x2;printf("输入三个实数：\n");scanf("%d%d%d",&a,&b,&c);p=b*b-4*a*

lf%错了,应该是%lf

(1)当b²-4ac

double改做float再问：yiyuanercifangcheng.cpp(25):warningC4244:'=':conversionfrom'int'to'float',possiblelo

#includefloatf(float);voidmain(){floata,b,c,d,x1,x2,p,q;printf("a=");scanf("%f",&a);printf("b=");sca

#include <stdio.h>#include <math.h>void main(){float a,b,c,x1,x2,di

#include"stdio.h"#include"math.h"/*求一元二次方程ax*x+bx+c=0的解*/main(){floata,b,c,x1=0.,x2=0.,d;printf("请输入

/*结束程序请按“Ctrl+z”*/#include#includeintmain(){floata,b,c;doubled,x1,x2;printf("Enterthecoefficient

矩阵问题：求出x1^2x2^2x3^2x1x2x3111的逆矩阵,用这个逆矩阵右乘（y1,y2,y2),就分别的a,b,c

double类型的不能直接用==0来判断,用fabs(a)

#include#include#includevoidmain(){floata,b,c,x1,x2,delta;intflag;printf("a=");scanf("%f",&a);printf

#include#includevoidmain(){floata,b,c,disc,x1,x2,realpart,imagpart;scanf("%f,%f,%f",&a,&b,&c);disc=b

给个算法的框架,你可以自己细化.#include"math.h"floata,b,c,delta;scanf("%f,%f,%f",&a,&b,&c);delta=b*b-4*a*c;if(delta

#include"stdio.h"#include"math.h"#include"windows.h"voidmain(){floata,b,c;printf("----计算一元二次方程ax^2+b