int整数输入输出外挂

输入：

int in_d(){

    char c;
    int sgn,ret;
    if(c=getchar(),c==EOF)
        return 0;
    while(c!='-'&&(c<'0'||c>'9'))
        c=getchar();
    sgn=(c=='-')?-1:1;
    ret=(c=='-')?0:(c-'0');
    while(c=getchar(),c>='0'&&c<='9')
        ret=ret*10+(c-'0');
    ret *=sgn;
    return ret;
}