How to install jdk and fix javac cmd.

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+indexof(ch:char)

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Return type int. Returns the index of the first occurrence of ch in the string. Returns-1 if not matched. import java.lang.String; class indexof{                         public static void main(String[] args){                          String str="Welcome to java";                         int i="welcome".indexOf('l');                        System.out.println("Index of l in \" "+str+"\"  is : "+i);                      } } Output :    Index of l in "Welcome to java is : 2
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Program to plot Quadrant strip

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#include<GL/glut.h> #include<GL/glu.h> #include<GL/gl.h> void quadstrip() { glClear(GL_COLOR_BUFFER_BIT); glColor3f(1,0,0); glBegin(GL_QUAD_STRIP); glVertex2i(-60,0); glVertex2i(-40,50); glVertex2i(60,30); glColor3f(0,1,0); glVertex2i(60,-50); glVertex2f(45,61); glEnd(); glFlush(); } void init() { glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(-65,65,-65,65); } int main(int argc,char **argv) { glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE); glutInitWindowSize(500,500); glutCreateWindow("QUAD STRIP"); init(); glutDisplayFunc(quadstrip); glutMainLoop(); }
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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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