How to use the pyccel.printers.ccode function in pyccel

def test_ccode_functions():
    assert ccode(sin(x) ** cos(x)) == "pow(sin(x), cos(x))"
    assert ccode(ceiling(x)) == "ceil(x)"
    assert ccode(Abs(x)) == "fabs(x)"
    assert ccode(gamma(x)) == "tgamma(x)"

def test_ccode_sqrt():
    assert ccode(sqrt(x)) == "sqrt(x)"
    assert ccode(x**0.5) == "sqrt(x)"
    assert ccode(sqrt(Float(10))) == "3.16227766016838"

def test_ccode_constants_mathh():
    assert ccode(exp(1)) == "M_E"
    assert ccode(pi) == "M_PI"
    assert ccode(oo) == "HUGE_VAL"
    assert ccode(-oo) == "-HUGE_VAL"

def test_ccode_Piecewise():
    expr = Piecewise((x, x < 1), (x**2, True))
    assert ccode(expr) == (
            "((x < 1) ? (\n"
            "    x\n"
            ")\n"
            ": (\n"
            "    pow(x, 2)\n"
            "))")
    expr = Piecewise((Assign(c, x), x < 1), (Assign(c, x**2), True))
    assert ccode(expr) == (
            "if (x < 1) {\n"
            "    c = x;\n"
            "}\n"
            "else {\n"
            "    c = pow(x, 2);\n"
            "}")
    expr = Piecewise((x, x < 1), (x + 1, x < 2), (x**2, True))
    assert ccode(expr) == (
            "((x < 1) ? (\n"
            "    x\n"
            ")\n"
            ": ((x < 2) ? (\n"
            "    x + 1\n"
            ")\n"
            ": (\n"
            "    pow(x, 2)\n"

def test_ccode_sqrt():
    assert ccode(sqrt(x)) == "sqrt(x)"
    assert ccode(x**0.5) == "sqrt(x)"
    assert ccode(sqrt(Float(10))) == "3.16227766016838"

def test_ccode_Integer():
    assert ccode(Integer(67)) == "67"
    assert ccode(Integer(-1)) == "-1"

def test_ccode_constants_mathh():
    assert ccode(exp(1)) == "M_E"
    assert ccode(pi) == "M_PI"
    assert ccode(oo) == "HUGE_VAL"
    assert ccode(-oo) == "-HUGE_VAL"

def test_ccode_Assign():
    assert ccode(Assign(x, y + z)) == 'x = y + z;'
    assert ccode(AugAssign(x, '+', y + z)) == 'x += y + z;'

")\n"
            ": ((x < 2) ? (\n"
            "    x + 1\n"
            ")\n"
            ": (\n"
            "    pow(x, 2)\n"
            ")))")
    expr = x*y*z + x**2 + y**2 + Piecewise((0, x < 0.5), (1, True)) + cos(z) - 1
    assert ccode(expr) == (
            "pow(x, 2) + x*y*z + pow(y, 2) + ((x < 0.5) ? (\n"
            "    0\n"
            ")\n"
            ": (\n"
            "    1\n"
            ")) + cos(z) - 1")
    assert ccode(expr, assign_to='c') == (
            "c = pow(x, 2) + x*y*z + pow(y, 2) + ((x < 0.5) ? (\n"
            "    0\n"

def test_ccode_Assign():
    assert ccode(Assign(x, y + z)) == 'x = y + z;'
    assert ccode(AugAssign(x, '+', y + z)) == 'x += y + z;'