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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