struct have fuc guess!!! but use it GOOD!!

#include<stdio.h>
#include<string.h>

struct student {
    int code;
    char name[60];
    float gpa;
    char status[15];
};
struct student stds[4],max;


void showStudent(struct student stds[],int n);
void setStatus(struct student stds[],int n);
struct student maxGPA( struct student arrST[]);
float avgGPA(struct student arrST[]);
int countCritical(struct student arrST[]);


int main(){


    int i=0,n;
    printf("Enter your num student :");
    scanf("%d",&n);
//  n=4;
    printf("Enter new data\n");

    while (i<n){
        printf("Student%d\n",i+1);
        printf("Code: ");
        scanf("%d",&stds[i].code);fflush(stdin);
        printf("Name: ");
        gets(stds[i].name);
        printf("GPA: ");
        scanf("%f",&stds[i].gpa);
        i++;
    }
    setStatus(stds,n);
    showStudent(stds,n);


    return 0;
}

void showStudent( struct student stds[],int n){

    int i=0,c;
    float avg;

    max=maxGPA(stds);
    avg=avgGPA(stds);
    c=countCritical(stds);
    printf("\nAll students\n");
    while(i<n){
        printf("%d %s\tGPA= %.2f\nStatus: %s\n",stds[i].code,stds[i].name,stds[i].gpa,stds[i].status);
        i++;
    }
    printf("\nStudent Hit is %d %s\tGPA:%.2f\nStatus: %s\n",max.code,max.name,max.gpa,max.status);
    printf("\navgGPA Student is %.2f\n",avg);
    printf("\nCritical Student is %d\n",c);

}

void setStatus(struct student stds[],int n){
    int i=0;
    while (i<n){
        if(stds[i].gpa>=3.5){
            strcpy(stds[i].status ,"Excellent");
        }
        else if((stds[i].gpa<=3.49)&&(stds[i].gpa>=2.00)){
            strcpy(stds[i].status ,"Pass");
        }
        else if((stds[i].gpa<=1.99)&&(stds[i].gpa>=1.50)){
            strcpy(stds[i].status ,"Critical");
        }
        else if(stds[i].gpa<1.50){
            strcpy(stds[i].status ,"Fail");
        }
    i++;
    }
}
struct student maxGPA( struct student arrST[]){
    int i=0;
    int maxGpa, index = 0;
    while(i<4){
        maxGpa=arrST[0].gpa;
        if(maxGpa < arrST[i].gpa){
            maxGpa  = arrST[i].gpa;
            index = i;
        }
    i++;
    }
    return arrST[index];
}

float avgGPA(struct student arrST[]){
    int i=0;
    float avg=0;
    while(i<4){
        avg=avg+arrST[i].gpa;
    i++;
    }
    avg=avg/4;
    return avg;
}

int countCritical(struct student arrST[]){
    int i=0,c=0;
    while (i<4){
        if((stds[i].gpa<=1.99)&&(stds[i].gpa>=1.50)){
            c++;
        }

    i++;
    }
    return c;
}