Question

C language

6. You pilot a small plane. Your plane receives the following information from nearby planes: their three digit ID, and distance away in the x, y, and z directions Write a program that reads in the information from the file air test.txt and prints out the ID and distance of the nearby planes. If the distance is less than 12 miles print a warning message. (The file has one aircraft entry per line in the format 123 45 67 89. Distance is calculated by the equation sqrt(x+y'+z2). Submit the ID(s) of planes too close: Sample output: Aircraft ID: 557 Distance away: 27.09 Aircraft ID: 801 Distance away: 31.32 Aircraft ID: 665 Distance away: 98.31 Aircraft ID: 999 Distance away: 10.25**WARNING - -TOO CLOSE Aircraft ID: 414 Distance away: 110.81 Write a program that reads in a series of characters from a file called chars.txt. Count the total number of characters and the number of vowels and print it out (Vowels are a,e,i,o,u). 7. Submit the number of characters and of vowels in the file Sample output: There were 38 characters and 12 vowels in the file 8. Write a program the reads in a series of integers from a file called numbers.txt Sample output: There were 82 numbers in the file. Their average was 24.6 Calculate the average of the numbers in the file and submit that number and how many numbers were in the file: a. b. Write the square root of the number out to a text file.

Answer 1

Answer 6
======

#include <stdio.h>
int main(){
   int id;
   int x, y, z;
   double dist;
   FILE *fin = fopen("air_test.txt", "r");
   if(fin == NULL){
       printf("ERROR: could not open input file air_test.txt\n");
       return 1;
   }
  
  
   fscanf(fin, "%d %d %d %d", &id, &x, &y, &z);
   while(!feof(fin)){
       dist = sqrt(x*x + y*y + z*z);
       printf("Aircraft ID: %d Distance away: %.2f", id, dist);
       if(dist < 12)
           printf("*** WARNING -- TOO CLOSE");
       printf("\n");
       fscanf(fin, "%d %d %d %d", &id, &x, &y, &z);
   }
   fclose(fin);
}

Answer 7
=========
#include <stdio.h>
int main(){
   FILE *in = fopen("chars.txt", "r");
   char ch;
   int total = 0 , vowels = 0;
  
   if(in == NULL){
       printf("ERROR: could not open input file chars.txt\n");
       return 1;
   }
  
   ch = fgetc(in);
   while(!feof(in)){
       total++;
       if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' ||
       ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U' )
           vowels++;
      
       ch = fgetc(in);

   }
   fclose(in);
  
   printf("There were %d characters and %d vowels in the file.\n", total , vowels);
   return 0;
}

Answer 8
========
#include <stdio.h>
#include <math.h>
int main(){
   FILE *fin = fopen("numbers.txt", "r");
   int num;
   int count = 0;
   double total = 0, avg;
   FILE *fout = fopen("output.txt", "w");
   if(fin == NULL){
       printf("ERROR: could not open input file numbers.txt\n");
       return 1;
   }
  
   fscanf(fin, "%d", &num);
   while(!feof(fin)){
       count++;
       total += num;
       fscanf(fin, "%d", &num);
   }
   fclose(fin);
   avg = total / count;
  
   printf("There were %d numbers in the file. Their average was %.1f.\n", count , avg);
  
   //write the sqrt to output.txt
   fprintf(fout, "square root of %d = %.2f\n", count , sqrt(count));
   printf("Please check output.txt for square root\n");
  
   return 0;
}