C Program to find deviation from average of a given data

/*C Program to find deviation from average of a given data*/
#include<stdio.h>
#include<math.h>

void main() {
    int temp[7], i, sum = 0, av;
    float dev;
    printf("\nEnter the seven days temperature:\n");
    for (i = 0; i < 7; i++) {
        scanf("%d", &temp[i]);
        sum += temp[i];
    }
    av = sum / 7;
    for (i = 0; i < 7; i++) {
        dev = av - temp[i];
        dev = fabs(dev);
        printf("deviation= %3.1f\n", fabs(dev));
    }
}