Obtaining Meanings Using For Statements and Arrays

#include <stdio.h>

void main(){

    int num[];
    int jum;
    int max,min,sum,nums;
    float avg;
    int i=0;

    scanf ("Please enter the number of students." : : %d \n",&nums);
    for(i=0;i<nums;i++){
        scanf("Enter your score: %d",&num[i]);
        if(num[i]<0||num[i]>100){
            printf ("Please re-enter". \n");
        }
        if(num[i]<100 && num[i]>0){
            continue;
        }
        sum+=num[i];
    }

    max=num[0];
    min=num[0];

    for(i=0;i==0;i++){
        if(max<num[i]){
            max=num[i];
        }
        if(min>num[i]){
            min=num[i];
        }
    }

    avg=sum/nums;

    printf("Maximum value: %d\nMinimum value: %d\nAverage: %f\n", max, min, avg);

}