double long float类型读入读出 double取模 fmod

The library of fmod is #include <cmath>

#include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<map>
#include<cstring>
#include<cmath>
using namespace std;

int main(){
  double x;
  long y;
  long long z;

  scanf("%lf",&x);
  double doubleMod = fmod(x,(double)3);
  printf("The result of x mod 3 is %.2lf\n",doubleMod);

  scanf("%ld",&y);
  printf("The result of y is %ld\n", y);

  scanf("%lld", &z);
  printf("The result of z is %lld\n", z);

	return 0;
}

  cout << (-5) % 3 << endl;   // 结果是-2！。。！！。！！

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cout << fmod((double)(-5), (double)(-3))<<endl; //结果是-2！。！

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