Question

You are provided with an input file called "sensor.txt" and a "code skeleton" of the exam questions. The text file has 10 numbers.

1. You will scan the 10 values located in “sensor.txt” to an array of variable type double, using a loop of your choice.

2. You will create a user defined function that will take your array as an input and find the average value. (Ex. arr[] = {15, 12, 13, 10}, the sum will be 50 then divide by the number of values which gives you 12.5).

3. You will save the resulting average to a file called “results.txt” and also output it to the screen.

4. You will create a conditional statement that only outputs values from 20 to 50 to a second output file called “sensor2.txt”.

do it on c pls

Answer 1

#include <stdio.h>

// 2
double avergae(double values[], int size) {
    int i;
    double total = 0;
    for (i = 0; i < size; ++i) {
        total += values[i];
    }
    return total / size;
}

int main() {
    // 1. You will scan the 10 values located in “sensor.txt” to an array of variable type double, using a loop of your choice.
    int i;
    double arr[10];
    FILE *fp = fopen("sensor.txt", "r");
    if (!fp) {
        printf("sensor.txt does not exists. Exiting!\n");
    }
    for (i = 0; i < 10; ++i) {
        fscanf(fp, "%lf", arr + i);
    }
    fclose(fp);
    // 2. You will create a user defined function that will take your array as an input and find the average value. (Ex. arr[] = {15, 12, 13, 10},
    // the sum will be 50 then divide by the number of values which gives you 12.5).
    printf("Average = %lf\n", avergae(arr, 10));
    // 3. You will save the resulting average to a file called “results.txt” and also output it to the screen.
    FILE *fw = fopen("results.txt", "w");
    fprintf(fw, "%lf\n", avergae(arr, 10));
    fclose(fw);
    // 4. You will create a conditional statement that only outputs values from 20 to 50 to a second output file called “sensor2.txt”.
    fw = fopen("sensor2.txt", "w");
    for (i = 0; i < 10; ++i) {
        if (arr[i] >= 20 && arr[i] <= 50) {
            fprintf(fw, "%lf\n", arr[i]);
        }
    }
    fclose(fw);
    return 0;
}