Bài tập lệnh chọn lựa
Câu 1:
a, b;double
Console.Write("a=");
a = Convert.ToDouble(Console.ReadLine());
Console.Write("b=");
b = Convert.ToDouble(Console.ReadLine());
if (a == 0)
{
(b == 0)if
{
Console.WriteLine("vo so nghiem");
}
else
{
Console.WriteLine("vo nghiem");
}
}
else
{
Console.WriteLine( , -b / a);"co nghiem {0}"
}
Câu 2:
double a, b, c, max;
Console.Write( );"a="
a = Convert.ToDouble(Console.ReadLine());
Console.Write( );"b="
b = Convert.ToDouble(Console.ReadLine());
Console.Write( );"c="
c = Convert.ToDouble(Console.ReadLine());
max = a;
if (b > max)
{
max = b;
}
(c > max)if
{
max = c;
}
Console.WriteLine("{0} la so lon nhat", max);
Câu 3:
double x;
Console.Write( );"x="
x = Convert.ToDouble(Console.ReadLine());
if (x<0 || x>100)
{
Console.WriteLine( , x); "{0} khong thuoc doan nao"
}
else if (x<=25)
{
Console.WriteLine( , x);"{0} thuoc doan [0;25]"
}
else if (x<=50)
{
Console.WriteLine( , x);"{0} thuoc doan [25;50]"
}
else if (x<=75)
{
Console.WriteLine( , x);"{0} thuoc doan [50;75]"
}
else
{
Console.WriteLine( , x);"{0} thuoc doan [75;100]"
}
Câu 4:
double a, b;
Console.Write( );"code "
a = Convert.ToInt32(Console.ReadLine());
Console.Write( );"so luong "
b = Convert.ToInt32(Console.ReadLine());
if (a == 1)
{
Console.WriteLine( , 4 * b);"so tien phai tra la: {0}"
}
if (a == 2)
{
Console.WriteLine( , 4,5 * b);"so tien phai tra la: {0}"
}
if (a == 3)
{
Console.WriteLine( , 5 * b);"so tien phai tra la: {0}"
}
if (a == 4)
{
Console.WriteLine( , 2 * b);"so tien phai tra la: {0}"
}
if (a == 5)
{
Console.WriteLine( , 1 * b);"so tien phai tra la: {0}"
}
Câu 5:
double x, y;
Console.Write( );"x="
x = Convert.ToDouble(Console.ReadLine());
Console.Write( );"y="
y = Convert.ToDouble(Console.ReadLine());
if (x == 0 && y == 0)
{
Console.WriteLine("goc toa do");
}
else if (x > 0 && y > 0)
{
Console.WriteLine("thuoc Q1");
}
else if (x > 0 && y < 0)
{
Console.WriteLine("thuoc Q4");
}
else if (x < 0 && y > 0)
{
Console.WriteLine("thuoc Q2");
}
else if (x < 0 && y < 0)
{
Console.WriteLine("thuoc Q3");
}
else if (x == 0)
{
Console.WriteLine("thuoc Oy");
}
(y == 0)else if
{
Console.WriteLine("thuoc Ox");
}
Câu 6:
double a, b, c, max;
Console.Write( );"a="
a = Convert.ToDouble(Console.ReadLine());
Console.Write( );"b="
b = Convert.ToDouble(Console.ReadLine());
Console.Write( );"c="
c = Convert.ToDouble(Console.ReadLine());
if (a>b)
{
max = a;
a = b;
b = max;
}
if (a>c)
{
max = a;
a = c;
c = max;
}
if (b>c)
{
max = b;
b = c;
c = max;
}
Console.WriteLine("n thu tu tang dan:{0} {1} {2}", a, b, c);

Preview text:

Bài tập lệnh chọn lựa Câu 1: double a, b; Console.Write("a=");
a = Convert.ToDouble(Console.ReadLine()); Console.Write("b=");
b = Convert.ToDouble(Console.ReadLine()); if (a == 0) { if (b == 0) {
Console.WriteLine("vo so nghiem"); } else {
Console.WriteLine("vo nghiem"); } } else {
Console.WriteLine("co nghiem {0}", -b / a); } Câu 2: double a, b, c, max; Console.Write("a=");
a = Convert.ToDouble(Console.ReadLine()); Console.Write("b=");
b = Convert.ToDouble(Console.ReadLine()); Console.Write("c=");
c = Convert.ToDouble(Console.ReadLine()); max = a; if (b > max) { max = b; } if(c > max) { max = c; }
Console.WriteLine("{0} la so lon nhat", max); Câu 3: double x; Console.Write("x=");
x = Convert.ToDouble(Console.ReadLine()); if (x<0 || x>100) {
Console.WriteLine("{0} khong thuoc doan nao", x); } else if(x<=25) {
Console.WriteLine("{0} thuoc doan [0;25]", x); } else if(x<=50) {
Console.WriteLine("{0} thuoc doan [25;50]", x); } else if (x<=75) {
Console.WriteLine("{0} thuoc doan [50;75]", x); } else {
Console.WriteLine("{0} thuoc doan [75;100]", x); } Câu 4: double a, b; Console.Write("code ");
a = Convert.ToInt32(Console.ReadLine()); Console.Write("so luong ");
b = Convert.ToInt32(Console.ReadLine()); if (a == 1) {
Console.WriteLine("so tien phai tra la: {0}", 4 * b); } if (a == 2) {
Console.WriteLine("so tien phai tra la: {0}", 4,5 * b); } if (a == 3) {
Console.WriteLine("so tien phai tra la: {0}", 5 * b); } if (a == 4) {
Console.WriteLine("so tien phai tra la: {0}", 2 * b); } if (a == 5) {
Console.WriteLine("so tien phai tra la: {0}", 1 * b); } Câu 5: double x, y; Console.Write("x=");
x = Convert.ToDouble(Console.ReadLine()); Console.Write("y=");
y = Convert.ToDouble(Console.ReadLine()); if (x == 0 && y == 0) {
Console.WriteLine("goc toa do"); }
else if (x > 0 && y > 0) {
Console.WriteLine("thuoc Q1"); }
else if (x > 0 && y < 0) {
Console.WriteLine("thuoc Q4"); }
else if (x < 0 && y > 0) {
Console.WriteLine("thuoc Q2"); }
else if (x < 0 && y < 0) {
Console.WriteLine("thuoc Q3"); } else if (x == 0) {
Console.WriteLine("thuoc Oy"); } else if (y == 0) {
Console.WriteLine("thuoc Ox"); } Câu 6: double a, b, c, max; Console.Write("a=");
a = Convert.ToDouble(Console.ReadLine()); Console.Write("b=");
b = Convert.ToDouble(Console.ReadLine()); Console.Write("c=");
c = Convert.ToDouble(Console.ReadLine()); if (a>b) { max = a; a = b; b = max; } if (a>c) { max = a; a = c; c = max; } if (b>c) { max = b; b = c; c = max; }
Console.WriteLine("n thu tu tang dan:{0} {1} {2}", a, b, c);