Fix clippy lint errors

Author: krishna-veerareddy

clippy_lints/src/floating_point_arithmetic.rs

@@ -120,18 +120,19 @@ fn check_ln1p(cx: &LateContext<'_, '_>, expr: &Expr, args: &HirVec<Expr>) {
 // can be converted to an integer without loss
 // TODO: Add a better check to determine whether the float can be
 // casted without loss
-fn get_integer_from_float_constant(value: Constant) -> Option<i64> {
+#[allow(clippy::cast_possible_truncation)]
+fn get_integer_from_float_constant(value: &Constant) -> Option<i64> {
     match value {
-        F32(num) if num.trunc() == num => {
-            if num > -16_777_217.0 && num < 16_777_217.0 {
-                Some(num as i64)
+        F32(num) if (num.trunc() - num).abs() <= std::f32::EPSILON => {
+            if *num > -16_777_217.0 && *num < 16_777_217.0 {
+                Some(num.round() as i64)
             } else {
                 None
             }
         },
-        F64(num) if num.trunc() == num => {
-            if num > -9_007_199_254_740_993.0 && num < 9_007_199_254_740_993.0 {
-                Some(num as i64)
+        F64(num) if (num.trunc() - num).abs() <= std::f64::EPSILON => {
+            if *num > -9_007_199_254_740_993.0 && *num < 9_007_199_254_740_993.0 {
+                Some(num.round() as i64)
             } else {
                 None
             }
@@ -175,7 +176,7 @@ fn check_powf(cx: &LateContext<'_, '_>, expr: &Expr, args: &HirVec<Expr>) {
         } else if F32(1.0 / 3.0) == value || F64(1.0 / 3.0) == value {
             help = "cube-root of a number can be computed more accurately";
             method = "cbrt";
-        } else if let Some(exponent) = get_integer_from_float_constant(value) {
+        } else if let Some(exponent) = get_integer_from_float_constant(&value) {
             span_lint_and_sugg(
                 cx,
                 FLOATING_POINT_IMPROVEMENTS,