Question

I need help with the following code...

Instructions:

This lab builds on the skills from Lab 2c, in which you read data values from a file and kept a count of the number of invalid values. In this lab, your program will be using the same code to read each data entry from the file, but you will also save each value in an array named allMags after each is read in. When all values in the file have been read, your program should call various functions to perform processing tasks using the array values.

You will be working in teams of 3, with duties assigned as follows:

Part a.    Together, write and test the function to create a new array of just valid magnitude values

All Team Members:   First add the code needed in your overall large program to read ALL of the values in the data file and save them, one by one, in an array named allMags. Together, write a getValids function, which takes an array of floating point values, and copies only the valid values into a new array also provided as an input parameter. Name your program lastname1_lastname2_lastname3.c, including all of the last names of the team members.

Add this new function getValids below the main function in your program. Don’t forget to add a prototype statement for the function, above main. Question 1: where should the new array containing only valid values be defined? (Hint: Name the new array validMags, but do not create it inside the getValids function.) Question 2: Does each function that processes an array provided as a parameter need to have the length of the array provided as a parameter as well?

Add the code to call the getValids function from main, and test your program to make sure that it works correctly by displaying all of the values in the validMags array after the getValids function returns.

In the next part, the code for the each of the tasks should be completed separately by each team member, tested, and if correct, added to the overall program. Don’t forget to add the functions below main and to define prototypes for each.

THIS IS THE CODE FROM LAB2C:

#include <stdio.h>

int main(void) {

FILE* inFile = NULL; // File pointer

float fileNum; // Data value from file

int value_greater_than_three =0 , invalid_entries = 0 ,i =0;

// Open file

printf("Opening file epquakes.txt \n");

inFile = fopen("epquakes.txt", "r");

if (inFile == NULL) {

printf("Could not open file epquakes.txt \n");

return -1; // -1 indicates error

}

// Print read numbers to output

printf("Reading and printing numbers.\n");

/* while (!feof(inFile)) {

fscanf(inFile, "%f", &fileNum);

printf("num: %f\n", fileNum);

if(fileNum > 3.0)

value_greater_than_three++;

if(fileNum < 0.0)

invalid_entries++;

} */

for(i=0;i<10;i++) {

fscanf(inFile, "%f", &fileNum);

if(fileNum > 3.0)

value_greater_than_three++;

if(fileNum < 0.0)

invalid_entries++;

}

printf("Closing file epquakes.txt \n");

// Done with file, so close it

fclose(inFile);

printf("%d entries are greater than 3 \n",value_greater_than_three);

printf("%d entries are invalid entries \n",invalid_entries);

return 0;

}

THANKS!

Answer 1

NOTE: From the code provided I've assumed that the number of entries in the file is 10 and a value less than 0 is invalid. I've added the required code to LAB2C

Answers to Questions:

1: I've defined validMags array in the main() funciton

2: Yes, functions require the size of array as parameter

#include <stdio.h>

//Function Prototype

void getValids(float allMags[], float validMags[], int size);

int main(void) {

FILE* inFile = NULL; // File pointer

//No nedd // float fileNum; // Data value from file

int value_greater_than_three = 0 , invalid_entries = 0 , i = 0;

float allMags[10], validMags[10]; // To store all values

// Open file

printf("Opening file epquakes.txt \n");

inFile = fopen("epquakes.txt", "r");

if (inFile == NULL) {

printf("Could not open file epquakes.txt \n");

return -1; // -1 indicates error

}

// Print read numbers to output

//printf("Reading and printing numbers.\n");

/* while (!feof(inFile)) {

fscanf(inFile, "%f", &fileNum);

printf("num: %f\n", fileNum);

if(fileNum > 3.0)

value_greater_than_three++;

if(fileNum < 0.0)

invalid_entries++;

} */

for (i = 0; i < 10; i++) {

fscanf(inFile, "%f", &allMags[i]);

if (allMags[i] > 3.0)

value_greater_than_three++;

if (allMags[i] < 0.0)

invalid_entries++;

}

// Calling getValids() function

getValids(allMags, validMags, 10);

// Number of valid entries

int valid_entries = 10 - invalid_entries;

// Printing validMags array

printf("Printing valid entries.\n");

for(i = 0; i < valid_entries; i++) {

printf("%f\n", validMags[i]);

}

printf("Closing file epquakes.txt \n");

// Done with file, so close it

fclose(inFile);

printf("%d entries are greater than 3 \n", value_greater_than_three);

printf("%d entries are invalid entries \n", invalid_entries);

return 0;

}

//Function Declarations

void getValids(float allMags[], float validMags[], int size) {

int i,j;

for(i = 0, j = 0; i < size; i++) {

if(allMags[i] > 0.0) {

validMags[j] = allMags[i];

j++;

}

}

}

Code

$valid.c epquakes.txt 1 #include«stdio.h> 3 //Function Prototype 4 void getValids (float allMags, float validMags, int size); 6 int main(void) { FILE inFile = NULL; // File pointer //No nedd// float fileNum; // Data value from file int value-greater-than-three- θ , învalid-entries = θ , i = θ; float allMags [10], validMags [10]: // To store all values 10 12 13 14 15 16 1/ Open file 17 18 19 20 21 printf(Opening file epquakes.txt In): inFile-fopen(epquakes.txt, r); if (inFile == NULL) { 23 24 25 26 27 28 29 30 1/ Print read numbers to output 31 32 printf(Could not open file epquakes.txt In) return -1; // -1 indicates error 34 35 36 37 38 //printf( Reading and printing numbers.In) *while (!feof(inFile)) fscanf (inFile, f, &fileNum); printf(num: %f\n, fileNum);$ epquakes.txt file that I've written for testing

Output