用C语言求二元一次方程的根

如题所述

# include <stdio.h>
# include <math.h>
int main(void)
{
double a, b, c;
double delta;
double x1, x2;
char ch;
do
{
printf("请输入一元二次方程的三个系数:\n");
printf("a = ");
scanf("%lf", &a);
printf("b = ");
scanf("%lf", &b);
printf("c = ");
scanf("%lf", &c);
delta = b*b - 4*a*c;

if (delta > 0)
{
x1 = (-b + sqrt(delta)) / (2*a);
x2 = (-b - sqrt(delta)) / (2*a);
printf("有两个解，x1 = %lf, x2 = %lf\n", x1, x2);
}
else if (0 == delta)
{
x1 = x2 = (-b) / (2*a);
printf("有唯一解，x1 = x2 = %lf\n", x1, x2);
}
else
{
printf("无实数解!\n");
}

printf("您想继续么(Y/N): ");
scanf(" %c", &ch); //%c前面必须得加一个空格 原因略
} while ('y'==ch || 'Y'==ch);
return 0;
}
希望可以帮到你，如果满意请采纳！

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