/* 标准文档模板 */ #include "Stdio.h" #include "Conio.h" # include<math.h> float x1,x2,disc,p,q; greater-than-zero(float a,float b) { x1=(-b+sqrt(disc))/(2*a); x2=(-b-sqrt(disc)/(2*a); } equal-to-zero(float a,float b) { x1=x2=(-b)/(2*a); } smaller-than-zero(float a,float b) { p=-b/(2*a); q=sqrt(disc)/(2*a); } main() { float a,b,c; printf("\n input a,b,c:"); scanf("%f,%f,%f",&a,&b,&c); disc=b*b-4*a*c; printf("root:\n"); if(disc>0) { greater-than-zero(a,b); printf("x1=%5.2f\tx2=%5.2f\n",x1,x2); } else if(disc==0) {equal-to-zero(a,b); printf("x1=%5.2f\tx2=%5.2f\n",x1,x2); } else {smaller-than-zero(a,b); printf("x1=%5.2f\t x2=%5.2f\n",x1,x2); } getch(); }greater-than-zero(float a,float b) 红色部分系统提示有语法错误 请问错在哪

函数名称中不可以使用“-”

改成下划线，应该可以的！

你好好去看看c语言中是怎么定义变量的。你怎么犯这样的错误....

谢谢！！！
#include "Stdio.h"
#include "Conio.h"
# include&lt;math.h&gt;
float x1,x2,disc;
greater_than_zero(float a,float b)
{
x1=(-b+sqrt(disc))/(2*a);
x2=(-b-sqrt(disc))/(2*a);
}
equal_to_zero(float a,float b)
{
x1=x2=(-b)/(2*a);
}

main()
{
float a,b,c;
printf("\n input a,b,c:\n");
scanf("%f%f%f", &amp;a,&amp;b,&amp;c);
disc=b*b-4*a*c;
printf("root:\n");
if(disc&gt;0)
{
  greater_than_zero(a,b);
  printf("x1=%5.2f\tx2=%5.2f\n",x1,x2);
}
else if(disc==0)
  {equal_to_zero(a,b);
   printf("x1=%5.2f\tx2=%5.2f\n",x1,x2);
  }
  else
  printf("NO ROOT");
getch();
}

[此贴子已经被作者于2005-4-19 20:00:15编辑过]