finaaaaaaal

#include<stdio.h>
int unionArray[40];
int unionArraySize;
int intersectionArray[20];
int intersectionArraySize;
int counterUn=0,counterIn=0;
void print2 (int arr[],int size1){
    int i ;
    for(i=0;i<size1;i++){
        printf ("%d  ",arr[i]);
    }
    printf("\n");
}
void read(int arr[],int size1){
    int i;
    for (i=0;i<size1;i++){
        printf (" #%d \n",i+1);
        scanf("%d",&arr[i]);
        printf("\n");
    }
}
void getUnion(int arr1[], int size1, int arr2[], int size2){
    int i,j,f,n=0;
    for (i=0;i<size1;i++){
        unionArray[i]=arr1[i];
    }
    for(i=0;i<size2;i++){
            f=1;
        for(j=0;j<size1;j++){
            if (unionArray[j]==arr2[i]){f=-1;}
        }
        if(f==1){
            unionArray[size1+n]=arr2[i];
            counterUn++;n++;
        }
    }
    counterUn+=size1;
}
void getIntersection(int arr1[], int size1, int arr2[], int size2){
    int i,j,n=0;
    for(i=0;i<size1;i++){
        for(j=0;j<size2;j++){
            if (arr1[i]==arr2[j]){
                intersectionArray[n++]=arr1[i];
                counterIn++;
                break;
            }
        }
    }
}
 main (){
    int size1,size2,arr1[20],arr2[20];
    printf("enter size of array 1\n");
    scanf("%d",&size1);
    printf("enter size of array 2 \n");
    scanf("%d",&size2);
    printf("enter first array\n");
    read(arr1,size1);
    printf("enter second array\n");
    read(arr2,size2);
    getUnion(arr1,size1,arr2,size2);
    getIntersection(arr1,size1,arr2,size2);
    printf("union is :\n");
    print2 (unionArray,counterUn);
    printf("Intersection is : \n");
    print2 (intersectionArray,counterIn);
}