Visual c++ 我想在末尾添加一个百分号（%），这样它就会包含在文本框中，有人知道怎么做吗？ 字符串^temp=（sum.ToString（）+“%”；textBox5->Text=temp； private: System::Void button1_Click(Sys

我想在末尾添加一个百分号（%），这样它就会包含在文本框中，有人知道怎么做吗？ 字符串^temp=（sum.ToString（）+“%”；textBox5->Text=temp；

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
             // Declare variables
             double num1, num2, num3, num4, sum;

             // Read in data
             Double::TryParse(textBox1->Text, num1);
             Double::TryParse(textBox2->Text, num2);
             Double::TryParse(textBox3->Text, num3);
             Double::TryParse(textBox4->Text, num4);

             // Process data
             sum = num1 + num2 + num3 + num4;
             sum = sum / 550 * 100 + "%";

             //Display results
             textBox5->Text = sum.ToString();

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
         // Declare variables
         double num1, num2, num3, num4, sum;

         // Read in data
         Double::TryParse(textBox1->Text, num1);
         Double::TryParse(textBox2->Text, num2);
         Double::TryParse(textBox3->Text, num3);
         Double::TryParse(textBox4->Text, num4);

         // Process data
         sum = num1 + num2 + num3 + num4;
         sum = sum / 550 * 100 + "%";

         //Display results
         String^ temp = (sum.ToString() + "%"); 
         textBox5->Text = temp;