c语言 求绝对值 程序哪错了?#include int main(void){double a,abstr(double a);printf("enter areal number please");scanf ("%lf",&a);printf ("abstr(%lf)=%lf\n",a,abstr(a));return 0;}错误信息Cpp1.obj : error LNK2001: unresolved external symb
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![c语言 求绝对值 程序哪错了?#include int main(void){double a,abstr(double a);printf(](/uploads/image/z/3295913-41-3.jpg?t=c%E8%AF%AD%E8%A8%80+%E6%B1%82%E7%BB%9D%E5%AF%B9%E5%80%BC+%E7%A8%8B%E5%BA%8F%E5%93%AA%E9%94%99%E4%BA%86%3F%23include+int+main%28void%29%7Bdouble+a%2Cabstr%28double+a%29%3Bprintf%28%22enter+areal+number+please%22%29%3Bscanf+%28%22%25lf%22%2C%26a%29%3Bprintf+%28%22abstr%28%25lf%29%3D%25lf%5Cn%22%2Ca%2Cabstr%28a%29%29%3Breturn+0%3B%7D%E9%94%99%E8%AF%AF%E4%BF%A1%E6%81%AFCpp1.obj+%3A+error+LNK2001%3A+unresolved+external+symb)
c语言 求绝对值 程序哪错了?#include int main(void){double a,abstr(double a);printf("enter areal number please");scanf ("%lf",&a);printf ("abstr(%lf)=%lf\n",a,abstr(a));return 0;}错误信息Cpp1.obj : error LNK2001: unresolved external symb
c语言 求绝对值 程序哪错了?
#include
int main(void)
{double a,abstr(double a);
printf("enter areal number please");
scanf ("%lf",&a);
printf ("abstr(%lf)=%lf\n",a,abstr(a));
return 0;}
错误信息Cpp1.obj : error LNK2001: unresolved external symbol "double __cdecl abstr(double)" (?abstr@@YANN@Z)
Debug/Cpp1.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Cpp1.exe - 2 error(s), 0 warning(s)
c语言 求绝对值 程序哪错了?#include int main(void){double a,abstr(double a);printf("enter areal number please");scanf ("%lf",&a);printf ("abstr(%lf)=%lf\n",a,abstr(a));return 0;}错误信息Cpp1.obj : error LNK2001: unresolved external symb
#include
#include
int main(void)
{double a;
printf("enter areal number please");
scanf ("%lf",&a);
printf ("abstr(%lf)=%lf\n",a,fabs(a)); //求绝对值用 fabs();要包含 math.h头文件
return 0;}