Java Selection Statement

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Java Supports two selection statements: if and switch. These statements allow you to control the flow of your program’s execution based upon conditions known only during run time. You will be pleasantly surprised by the power and flexibility contained in these two statements.

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Shutdown Pc

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#include<iostream> #include<stdlib.h> #include<conio.h> using namespace std; int main() {    int ch;   while(1)   {   cout<<"1. Shutdown\n2. Open TaskManager\n3. Open My Documents.\n4. Exit\nChoice : ";   cin>>ch;     switch (ch)   {   case 1:       system("C:\\WINDOWS\\System32\\shutdown /s");       break; case 2: system("C:\\WINDOWS\\System32\\taskmgr /s"); break; case 3: system("C:\\WINDOWS\\explorer /s"); break; case 4: return 0; } }   getch();     return 0; } Output:
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Ellipse using OpenGl

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#include<gl/glut.h> #include<gl/glu.h> #include<gl/gl.h> #include<iostream> using namespace std; int xc=0,yc=0,rx=40,ry=60; void display() { float rxsq=rx*rx; float rysq=ry*ry; float x=0,y=ry,p; float px=0,py=2*rxsq*y; glClear(GL_COLOR_BUFFER_BIT); glPointSize(1); glBegin(GL_POINTS); glVertex2i(xc+x,yc+y); glVertex2i(-(xc+x),-(yc+y)); cout<<xc+x<<" "<<yc+y<<endl; p=rysq-(rxsq-ry)+(0.25*rxsq); while(px<py) { x++; px=px+2*rysq; if(p<0) p=p+rysq+px; else { y--; py=py-2*rxsq; p=p+rysq+px-py; } glVertex2i(xc+x,yc+y); glVertex2i(xc+x,-(yc+y)); glVertex2i(-(xc+x),yc+y); glVertex2i(-(xc+x),-(yc+y)); cout<<xc+x<<" "<<yc+y<<endl; } p=rysq*(x+0.5)*(x+0.5) + rxsq*(y-1)*(y-1) -rxsq*rysq; while(y>0) { y--; py=py-2*rxsq; if(p>0) { p=p+rxsq-py; } else { x++; px=px+2*rysq
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String Comparisons

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The String class provides the methods for comparing strings, as given below:-                       Method                                                            Defination str2.equals(s1: String): boolean                        Returns true if this string is equal to string s1. str2.equalsIgnoreCase(s1: String): boolean      Returns true if this string is equal to string s1 case                                                                                   insensitive. str2.compareTo(s1: String): int                        Returns an integer greater than 0, equal to 0, or less                                                                                 than 0 to indicate whether this string is greater than,                                                                                 equal to, or less than s1. str2.compareToIgnoreCase(s1: String): int      Same as compareTo except that the comparison is case                                                      
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