#include <stdio.h>
#include <stdlib.h>
void sign_off(void);
void too_bad(void);

int main(void)
{
    int n;
    atexit(sign_off);
    puts("Enter an integer:");
    if(scanf("%d",&n)!=1)
    {
       puts("That's no integer!");
       atexit(too_bad);
       exit(EXIT_FAILURE);
    }
    printf("%d is %s.\n",n,(n%2==0)?"even":"odd");
    system("pause");
    return 0;
}

void sign_off(void)
{
     puts("Thus terminates another magnificent program from");
     puts("SeeSaw Software!");
}

void too_bad(void)
{
     puts("SeeSaw software extends its heartfelt condolences");
     puts("to you upon the failure of your program.");
}

在IDE 中运行该程序时，可能看不到最后2行输出。

运行结果：
Enter an integer:
212
212 is even
Thus terminates another magnificent program from
SeeSaw Software!
我想请问一下，这里的“IDE”指的是什么意思呀！而我的就是看不到最后2行输出。