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

int main()
{
int y;
while(scnaf("%d",&y)!=EOF){
if(1912<=y && y<=2147483647)
printf("%d",y-1912);}
return 0;
}

題目有提到y(1912<=y<=2147483647) 

然後應該是要減1911才對，而不是1912

所以寫出來應該是

#include<stdio.h>

#include<stdlib.h>

int main(void){

    int y;

    while(scanf("%d", &y)!=EOF)

    { 

    if(1912<=y<=2147483647)

    printf("%d",y-1911);

}

    system("pause");

    return 0;

}