Merge pull request #3 from lovung/feature/Add-num-package-to-help-pro…

…cess-num-values

Add num package to help processing num values

num/int.go

@@ -0,0 +1,37 @@
+package num
+
+// Sign of a integer
+// 1 for positive
+// 0 for zero
+// -1 for negative
+func Sign(num int) int {
+	if num < 0 {
+		return -1
+	}
+	if num > 0 {
+		return +1
+	}
+	return 0
+}
+
+// MaxInt is compares and returns the larger one.
+func MaxInt(first int, rest ...int) int {
+	ans := first
+	for _, item := range rest {
+		if item > ans {
+			ans = item
+		}
+	}
+	return ans
+}
+
+// MinInt is compares and returns the lesser one.
+func MinInt(first int, rest ...int) int {
+	ans := first
+	for _, item := range rest {
+		if item < ans {
+			ans = item
+		}
+	}
+	return ans
+}

num/int_test.go

@@ -0,0 +1,75 @@
+package num
+
+import "testing"
+
+func TestSign(t *testing.T) {
+	type args struct {
+		num int
+	}
+	tests := []struct {
+		name string
+		args args
+		want int
+	}{
+		{args: args{-12}, want: -1},
+		{args: args{-6}, want: -1},
+		{args: args{0}, want: 0},
+		{args: args{6}, want: 1},
+		{args: args{12}, want: 1},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Sign(tt.args.num); got != tt.want {
+				t.Errorf("Sign() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestMaxInt(t *testing.T) {
+	type args struct {
+		first int
+		rest  []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want int
+	}{
+		{args: args{0, []int{-1, -2, -3, -4, -5}}, want: 0},
+		{args: args{12, []int{-1, -2, -3, -4, -5}}, want: 12},
+		{args: args{-12, []int{-1, -2, -3, -4, -5}}, want: -1},
+		{args: args{0, []int{1, 2, 3, 4, 5}}, want: 5},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := MaxInt(tt.args.first, tt.args.rest...); got != tt.want {
+				t.Errorf("MaxInt() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestMinInt(t *testing.T) {
+	type args struct {
+		first int
+		rest  []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want int
+	}{
+		{args: args{0, []int{-1, -2, -3, -4, -5}}, want: -5},
+		{args: args{12, []int{-1, -2, -3, -4, -5}}, want: -5},
+		{args: args{-12, []int{-1, -2, -3, -4, -5}}, want: -12},
+		{args: args{0, []int{1, 2, 3, 4, 5}}, want: 0},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := MinInt(tt.args.first, tt.args.rest...); got != tt.want {
+				t.Errorf("MinInt() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}