compiler-errors - C++ scanf 未在此范围内声明

Question

这是我的代码

#include <iostream>
#include <stdio.h>

using namespace std;

int main()
{
    long long int N = 0, product, sum;
    int t; scanf_s("%d", &t);  //// ERROR STARTS AT THIS LINE
    while (t--)
    {
        sum = 0;

        scanf_s("%d", &N);
        N = N / 2;

        product = 1;
        sum = 1; 
        for (int i = 1; i <= N; i++)
        {
            product = product * i;
            sum += product;
        }

        printf("%d \n", sum);
    }
    return 0;
}

我明白了 编译错误向 www.codechef.com 提交解决方案时

prog.cpp: In function 'int main()':
prog.cpp:9:25: error: 'scanf_s' was not declared in this scope
  int t; scanf_s("%d", &t);

我试过用 C++ (gcc-4.3.2) 编译, (C++ gcc-4.9.2)和 C++ 14 (g++4.9.2) ，没用。
为什么..？我已收录 <stdio.h> .

Answer 1

你可以改变scanf_s至 scanf .