Question

This is a C programming question.

We have a file containing floating point numbers (we don't know how many). Write a complete C program that alternately averages only the floating point numbers (for example 3.50, 12.507, 123.60,5.98 would lead to the result (12.507+5.98)/2), ignore the whole numbers. Use file input, assuming the file is named "numbers.data". The program should be compatible with files that contain several numbers on separate lines.

Answer 1

#include <stdio.h>

int main() {
    FILE *fp = fopen("numbers.data", "r");
    if (fp) {
        double total = 0, count = 0, n1, n2;
        while (fscanf(fp, "%lf", &n1) != EOF && fscanf(fp, "%lf", &n2) != EOF) {
            total += n2;
            ++count;
        }
        printf("Average of alternate numbers is %lf\n", total/count);
        fclose(fp);
    } else {
        printf("numbers.data does not exists\n");
    }
    return 0;
}