Вывести средне арифм или квадратичн

#include <stdio.h>
#include <string.h>
#include <math.h>
double arifm(FILE *file)
{
        double temp, sum = 0;
        float i = 0;
        while (fscanf(file, "%lf", &temp) == 1)
        {
                sum += temp;
                i++;
        }
        sum = sum / i;
        return sum;
}

double squad(FILE *file)
{
        double temp, sum = 0;
        int i = 0;
        while (fscanf(file, "%lf", &temp) == 1)
        {
                sum += temp * temp;
                i++;
        }
        sum = sqrt(sum / i);
        return sum;
}

int main(int argc, char**argv)
{
        FILE*file;
        double temp_1;

        file = fopen(argv[2], "r");
        if (argv[1] == "a")
        {
                temp_1 = arifm(file);
        }
        if (argv[1] == "s")
        {
                temp_1 = squad(file);
        }
        fclose(file);

        file = fopen(argv[2], "a");
        fseek(file, 0, SEEK_END);
        fprintf (file, "%lf", temp_1);
        fclose(file);

        return 0;
}