Cheaters problem

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define SIZE 100000

struct students{
    int id[SIZE];
    int isPointedAt[SIZE];
    int toTheLeft[SIZE];
    int toTheRight[SIZE];

};

void setId(struct students* students1);
void getId(struct students* students1);
void setPointed(struct students* students1);
void setNeighbors(struct students* students1);
void cheat(struct students* students1);
float results(struct students* students1);
void saveToFile(float res);
void makeAverage();

int main() {
    srand(time(0));
    float res=0;
    printf("Random number is: %d",rand());
    struct students students1;
    printf("Hello, World!\n");
    setId(&students1);
    setNeighbors(&students1);

    int i;
    for (i = 0; i < 10000; ++i) {
        setPointed(&students1);
        cheat(&students1);
        res=results(&students1);
        saveToFile(res);
    }

    makeAverage();
    return 0;
}

void setId(struct students* students1)
{
    int i;
    for (i = 0; i < SIZE; ++i) {
        students1->id[i] = i+1;
    }
}

void setPointed(struct students* students1)
{
    int i;
    for (i = 0; i < SIZE; ++i) {
        students1->isPointedAt[i] = 0;
    }
}

void setNeighbors(struct students* students1)
{
    int i;
    for (i = 0; i < SIZE; ++i) {
        if(students1->id==1)
        {
            students1->toTheRight[i]=SIZE;
            students1->toTheLeft[i]=i+1;

        }else if(students1->id==SIZE)
        {
            students1->toTheRight[i]=i-1;
            students1->toTheLeft[i]=1;
        }else
        {
            students1->toTheRight[i]=i-1;
            students1->toTheLeft[i]=i+1;
        }
    }
}

void getId(struct students* students1)
{
    int i;
    for (i = 0; i < SIZE; ++i) {
        printf("student %d Id: %d\n",i,students1->id[i]);
    }
}

void cheat(struct students* students1)
{
    int i;
    for (i = 0; i < SIZE; ++i) {
        if(rand()%2==0)     //if 1 then cheats left
        {
            students1->isPointedAt[students1->toTheRight[i]]=1;
        }else
        {
            students1->isPointedAt[students1->toTheLeft[i]]=1;
        }
    }
}

float results(struct students* students1)
{
    int notCheatedfrom=0;
        int i;
        for (i = 0; i < SIZE; ++i) {
            if(students1->isPointedAt[i]==0)
            {
                notCheatedfrom++;
            }
        }
   // printf("%d out of %d is %f\n",notCheatedfrom,SIZE,(float)notCheatedfrom/SIZE);
    return (float)notCheatedfrom/SIZE;
}
void saveToFile(float res)
{
    FILE* file;
    file = fopen("results.txt","a");
    fprintf(file,"%f\n",res);
    fclose(file);

}

void makeAverage()
{
    FILE* file;
    file = fopen("results.txt","r");
    float results[110000];
    char  line[10];
    int i=0;
    while (fgets(line, sizeof(line), file)) {
        /* note that fgets don't strip the terminating \n, checking its
           presence would allow to handle lines longer that sizeof(line) */
        results[i]=atof(line);
        i++;
    }
    fclose(file);
    int j;
    float average=0;
    for (j=0;j<i;j++) {

        average+=results[j];
    }
    average=average/j;
    printf("average result from %d results is: %f",j,average);
}