include<conio.h>
include<stdio.h>
include<stdlib.h>
include<math.h>
int k,i=0,m=0,flag=0;
int coef[10]={0};
float x1=0,x2=0,t=0;
float fx1=0,fdx1=0;
what is the benefits if the variables are defined outside of the function ,just after #include
thanks!!