C语言不知道为什么出现这样的错误

Question

#include<stdio.h>

int main()
{
    int size;
    printf("Enter number of values:");
    scanf("%d", &size);
    int a[size];
    
    int i;
    for(i=0,i<size,i++){
        scanf("%d",&a[i]);
    }
    printf("%d",a[i]);
    return 0;
}

Answer 1

int *a=new int[size];
程序退出前
delete [] a;