Quantum Fourier Transformation Circuit 1

OPENQASM 2.0;
include "qelib1.inc";

qreg q[4];
creg c[4];

cp(pi / 2) q[2], q[3];
cp(pi / 4) q[1], q[3];
cp(pi / 8) q[0], q[3];
h q[2];
cp(pi / 2) q[1], q[2];
cp(pi / 4) q[0], q[2];
h q[1];
cp(pi / 2) q[0], q[1];
h q[0];
swap q[1], q[2];
swap q[0], q[3];
measure q[3] -> c[3];
measure q[2] -> c[2];
measure q[1] -> c[1];
measure q[0] -> c[0];

// @columns [2,3,4,5,6,7,8,9,10,10,11,12,13,14,15]