Workshop 8

#include <stdio.h>
#define MAX 100

int main(){
    int sum = 0;
    int element[MAX];
    int i = 0;
    char filename[80];

    printf("Statistics Calculator\n");
    printf("=====================\n");

    printf("Enter the name of the data file: "); scanf("%s",filename);
    FILE * f;
    f = fopen(filename, "r");
    if (f == NULL){
        printf("Cannot open file\n");
        return;
    }
    while (!feof(f)){
        fscanf(f,"%d",&element[sum++]);
    }
    fclose(f);

    float m = 0.0;
    float s = 0.0;
    for(i=0; i<sum; i++){
        m += element[i];
        s += element[i]*element[i];
    }
    m/=sum;
    float res = s/sum - m*m;

    printf("The number of data values read from this file was %d\n", sum);
    printf("Their statistical mean is %f\n", m);
    printf("Their standard deviation is %f\n", res);

}