小编Jas*_*eol的帖子

我试图在C编程中找到平方根.但我得到的错误是对sqrt的未定义引用.我的代码是:

#include<stdio.h>
#include<math.h>
void main(void){
int x;
int y;
printf("Enter two number numbers");
scanf("%d", &x);
scanf("%d", &y);
int result;
result = ( x * x ) + ( y * y );
double finalresult = sqrt(result);
printf("%f\n", finalresult);
}

我想创建一个复选框,如果选中它,那么它应该显示下拉列表.如果未选中,则应隐藏下拉列表.这就是我的代码在Form.Designer.cs文件中的外观.

        this.comboBox2.FormattingEnabled = true;
        this.comboBox2.Items.AddRange(new object[] {
        "Database 1",
        "Database 2",
        "Database 3"});
        this.comboBox2.Location = new System.Drawing.Point(165, 436);
        this.comboBox2.Name = "comboBox2";
        this.comboBox2.Size = new System.Drawing.Size(150, 21);
        this.comboBox2.TabIndex = 13;
        this.comboBox2.Text = "Database";

和我在其他文件中的复选框代码是

 if  (checkBox1.CheckState == CheckState.Checked)
        {

        }