#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define ABONENTS_COUNT_MAX 500
#define LINE_MAX 256

typedef struct {
	char name[LINE_MAX];
	char phone_number[LINE_MAX];
	unsigned int installation_year; 
} abonent;

int abonents_compare (const void * a, const void * b) {
  return strcmp(((abonent*)a)->name,((abonent*)b)->name);
}

int main(int argc, char** argv){

	FILE * text_file = fopen(argv[1],"rt");
    
    abonent abonents[ABONENTS_COUNT_MAX];
    
    int abonents_count = 0;
    
    char buf_name[LINE_MAX], buf_number[LINE_MAX];
    
    int buf_year;
    
	while( fscanf(text_file,"%s %s %d", buf_name,buf_number,&buf_year)!= EOF){
		strcpy(abonents[abonents_count].name,buf_name);
		strcpy(abonents[abonents_count].phone_number,buf_number);
		abonents[abonents_count++].installation_year = buf_year;
	}
	
	fclose(text_file);
	
   qsort (abonents, abonents_count, sizeof(abonent), abonents_compare);
   FILE * struct_file = fopen("base.txt","w");	
   fwrite(abonents,sizeof(abonent),abonents_count,struct_file);
   fclose(struct_file);
	
	char name[LINE_MAX];
	while(1){
		printf("Enter the name: ");
		scanf("%s",name);
		for(int i=0; i<abonents_count; i++)
			if(strcmp(abonents[i].name,name)==0)
				printf("%s\n",abonents[i].phone_number);
  }
	
	return 0;
}

Console.WriteLine("Enter x: ");
int x = int.Parse(Console.ReadLine());
Console.WriteLine("Enter y: ");
int y = int.Parse(Console.ReadLine());
Console.WriteLine("Enter a: ");
char a = char.Parse(Console.ReadLine());
int F = 0;
if(Char.IsDigit(a))
	{
		F = x > y ? y : x;
	}
else if(Char.IsLetter(a))
	{
		F = x > y ? x : y;
	}
Console.WriteLine("\nX: {0} ; Y: {1} ; A: {2}\nF: {3}", x,y,a,F);
Console.ReadLine();