do...while 问题

[静夜比特]

请大虾们帮我看下这些代码哪里有问题。我是新手，刚学c。请大家帮帮忙。谢谢！！！

# 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("有两个实解, x1 = %lf, x2 = %lf\n", x1, x2);
}
else if (0 == delta)
{
x1 = x2 = (-b)/(2*a);
printf("有两个相同的实解, x1 = x2 = %lf\n", x1, x2);
}
else
{
printf("无实解\n");
}
//printf("您想继续吗？(y/n):\n");
//scanf(" %c", &ch);
} while(1);

return 0;
}

[KID_coder]

#include<stdio.h>
# 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("有两个实解, x1 = %lf, x2 = %lf\n", x1, x2);
		}
		else if (0 == delta)
		{
			x1 = x2 = (-b)/(2*a);
			printf("有两个相同的实解, x1 = x2 = %lf\n", x1, x2);
		} 
		else
		{ 
			printf("无实解\n");
		}
		printf("您想继续吗？(y/n):\n");
		fflush(stdin);              //清除缓存
		scanf("%c", &ch);            //%c前面去掉空格
		if ( ch=='n' )
			break;
	} while(1);
	
	return 0;
}

[s564654509]

代码能正确运行啊，你想改进那里啊?

[蓝染忽右介]

# 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("有两个实解, x1 = %lf, x2 = %lf\n", x1, x2);
		}
		else if (0 == delta)
		{
			x1 = x2 = (-b)/(2*a);
			printf("有两个相同的实解, x1 = x2 = %lf\n", x1, x2);
		} 
		else
		{ 
			printf("无实解\n");
		}
		printf("您想继续吗？(y/n):\n");
		scanf(" %c", &ch);
	} while(ch=='y'||ch=='Y');//here
	
	return 0;
}

[静夜比特]

这个代码我昨天在Vc++6.0中运行不了，我看了几遍，好像没问题，但运行的时候报错，cannot open debug

然后我就把它保存了，今天把它复制在这了。之后我用c-free打开，发现可以。在用vc++6.0也可以了。这是为什么？

[静夜比特]

很感谢你们的回复！！！！！！！！！！！！！！！！