include stdio include stdlib define int main int argc char argv FILE i

#include <stdio.h>
#include <stdlib.h>
#define N 5

int main(int argc, char *argv[]) {
	FILE *f;
	int i, F=-1,L=-2,flag = 1,k=0;
	double A[N];
	double temp,sum=0,sr;
	
		f=fopen("otr.txt","w+");
		if (f==NULL)
		{
			puts("Error with opening file!");
			return 1;
		} 
		for (i=0;i<N;i++)
	  	  scanf("%lf",&A[i]);
    	for (i=0;i<N;i++)
	  	{
	  		fprintf(f,"%lf",A[i]);
      	}
    	
		for (i=0;i<N;i++)
	 	{
	 		fscanf(f,"%lf", &A[i]);  
     	}
     	
		 for (i=0;i<N;i++)
	 	{
	  		printf("%lf ",A[i]);  
     	}
      
		for (i=0;i<N;i++) 
		{	 
			if (A[i] < 0) 
				{ 
					F=i; 
					break; 
				}	 
		} 
		
		if (F==-1) 
		{ 
			printf("There are no negative numbers!"); 
 
		} 
		for (i=N-1;i>=0;i--) 
		{ 
			if (A[i] < 0) 
			{ 
				L=i; 
				break; 
			} 
		}	 
		if (F==L) 
		{	 
			printf("There is only one negative number"); 
 
		} 
		else 
			if (A[F]==A[L]) 
			{ 
				printf("no sense"); 
				flag = 0; 
			} 
			else 
			{ 
   				temp = A[F]; 
				A[F]=A[L]; 
				A[L]=temp; 
			} 
		if (flag) 
		{  printf("Massive:\n");
			for (i=0;i<N;i++) 
			printf("%lf ", A[i]); 
		} 
    	for (i=0;i<N;i++)
      		if (A[i]<0)
      		{
	      		sum+=A[i];
	      		k++;
      		}
      
      	sr=sum/k;
    	for (i=0;i<N;i++)
	  	{
	  		fprintf(f,"%lf",A[i]);
      	}
      	fclose(f);
      	
      	
    	f=fopen("otr.txt","a+");
    	
		if (f==NULL)
		{
			puts("Error with opening file!");
			return 1;
		} 
    	fprintf(f,"%lf",sr);
    	fclose(f);
      
	return 0;
}