C++ floating point to integer type conversions

Question

What are the different techniques used to convert float type of data to integer in C++?

#include 

using namespace std;
struct database {
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Answer 1

For most cases (long for floats, long long for double and long double):

long a{ std::lround(1.5f) }; //2l
long long b{ std::llround(std::floor(1.5)) }; //1ll