Output:
HelloWorld.cpp:4:3: error: ‘PVector’ does not name a type
PVector pos;
^~~~~~~
HelloWorld.cpp:5:3: error: ‘PVector’ does not name a type
PVector move;
^~~~~~~
HelloWorld.cpp:7:3: error: ‘ArrayList’ does not name a type
ArrayList<Boid> friends;
^~~~~~~~~
HelloWorld.cpp:102:3: error: ‘PVector’ does not name a type
PVector getAverageDir () {
^~~~~~~
HelloWorld.cpp:123:3: error: ‘PVector’ does not name a type
PVector getAvoidDir() {
^~~~~~~
HelloWorld.cpp:145:3: error: ‘PVector’ does not name a type
PVector getAvoidAvoids() {
^~~~~~~
HelloWorld.cpp:164:3: error: ‘PVector’ does not name a type
PVector getCohesion () {
^~~~~~~
HelloWorld.cpp:214:2: error: expected ‘;’ after class definition
}
^
;
HelloWorld.cpp: In constructor ‘Boid::Boid(float, float)’:
HelloWorld.cpp:14:5: error: ‘move’ was not declared in this scope
move = new PVector(0, 0);
^~~~
HelloWorld.cpp:14:5: note: suggested alternative:
In file included from /usr/include/c++/7/bits/char_traits.h:39:0,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/c++/7/bits/stl_algobase.h:479:5: note: ‘std::move’
move(_II __first, _II __last, _OI __result)
^~~~
HelloWorld.cpp:14:16: error: expected type-specifier before ‘PVector’
move = new PVector(0, 0);
^~~~~~~
HelloWorld.cpp:15:5: error: ‘pos’ was not declared in this scope
pos = new PVector(0, 0);
^~~
HelloWorld.cpp:15:15: error: expected type-specifier before ‘PVector’
pos = new PVector(0, 0);
^~~~~~~
HelloWorld.cpp:18:31: error: too many arguments to function ‘long int random()’
thinkTimer = int(random(10));
^
In file included from /usr/include/c++/7/cstdlib:75:0,
from /usr/include/c++/7/ext/string_conversions.h:41,
from /usr/include/c++/7/bits/basic_string.h:6361,
from /usr/include/c++/7/string:52,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/stdlib.h:401:17: note: declared here
extern long int random (void) __THROW;
^~~~~~
HelloWorld.cpp:19:23: error: too many arguments to function ‘long int random()’
shade = random(255);
^
In file included from /usr/include/c++/7/cstdlib:75:0,
from /usr/include/c++/7/ext/string_conversions.h:41,
from /usr/include/c++/7/bits/basic_string.h:6361,
from /usr/include/c++/7/string:52,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/stdlib.h:401:17: note: declared here
extern long int random (void) __THROW;
^~~~~~
HelloWorld.cpp:20:5: error: ‘friends’ was not declared in this scope
friends = new ArrayList<Boid>();
^~~~~~~
HelloWorld.cpp:20:5: note: suggested alternative: ‘fread’
friends = new ArrayList<Boid>();
^~~~~~~
fread
HelloWorld.cpp:20:19: error: ‘ArrayList’ does not name a type
friends = new ArrayList<Boid>();
^~~~~~~~~
HelloWorld.cpp:20:33: error: expected primary-expression before ‘>’ token
friends = new ArrayList<Boid>();
^
HelloWorld.cpp:20:35: error: expected primary-expression before ‘)’ token
friends = new ArrayList<Boid>();
^
HelloWorld.cpp: In member function ‘void Boid::go()’:
HelloWorld.cpp:32:5: error: ‘pos’ was not declared in this scope
pos.add(move);
^~~
HelloWorld.cpp:32:13: error: ‘move’ was not declared in this scope
pos.add(move);
^~~~
HelloWorld.cpp:32:13: note: suggested alternative:
In file included from /usr/include/c++/7/bits/char_traits.h:39:0,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/c++/7/bits/stl_algobase.h:479:5: note: ‘std::move’
move(_II __first, _II __last, _OI __result)
^~~~
HelloWorld.cpp: In member function ‘void Boid::flock()’:
HelloWorld.cpp:36:5: error: ‘PVector’ was not declared in this scope
PVector allign = getAverageDir();
^~~~~~~
HelloWorld.cpp:37:13: error: expected ‘;’ before ‘avoidDir’
PVector avoidDir = getAvoidDir();
^~~~~~~~
HelloWorld.cpp:38:13: error: expected ‘;’ before ‘avoidObjects’
PVector avoidObjects = getAvoidAvoids();
^~~~~~~~~~~~
HelloWorld.cpp:39:13: error: expected ‘;’ before ‘noise’
PVector noise = new PVector(random(2) - 1, random(2) -1);
^~~~~
HelloWorld.cpp:40:13: error: expected ‘;’ before ‘cohese’
PVector cohese = getCohesion();
^~~~~~
HelloWorld.cpp:42:5: error: ‘allign’ was not declared in this scope
allign.mult(1);
^~~~~~
HelloWorld.cpp:42:5: note: suggested alternative: ‘alloca’
allign.mult(1);
^~~~~~
alloca
HelloWorld.cpp:43:10: error: ‘option_friend’ was not declared in this scope
if (!option_friend) allign.mult(0);
^~~~~~~~~~~~~
HelloWorld.cpp:45:5: error: ‘avoidDir’ was not declared in this scope
avoidDir.mult(1);
^~~~~~~~
HelloWorld.cpp:45:5: note: suggested alternative: ‘void’
avoidDir.mult(1);
^~~~~~~~
void
HelloWorld.cpp:46:10: error: ‘option_crowd’ was not declared in this scope
if (!option_crowd) avoidDir.mult(0);
^~~~~~~~~~~~
HelloWorld.cpp:48:5: error: ‘avoidObjects’ was not declared in this scope
avoidObjects.mult(3);
^~~~~~~~~~~~
HelloWorld.cpp:49:10: error: ‘option_avoid’ was not declared in this scope
if (!option_avoid) avoidObjects.mult(0);
^~~~~~~~~~~~
HelloWorld.cpp:51:5: error: ‘noise’ was not declared in this scope
noise.mult(0.1);
^~~~~
HelloWorld.cpp:52:10: error: ‘option_noise’ was not declared in this scope
if (!option_noise) noise.mult(0);
^~~~~~~~~~~~
HelloWorld.cpp:54:5: error: ‘cohese’ was not declared in this scope
cohese.mult(1);
^~~~~~
HelloWorld.cpp:55:10: error: ‘option_cohese’ was not declared in this scope
if (!option_cohese) cohese.mult(0);
^~~~~~~~~~~~~
HelloWorld.cpp:57:5: error: ‘stroke’ was not declared in this scope
stroke(0, 255, 160);
^~~~~~
HelloWorld.cpp:57:5: note: suggested alternative: ‘stdout’
stroke(0, 255, 160);
^~~~~~
stdout
HelloWorld.cpp:59:5: error: ‘move’ was not declared in this scope
move.add(allign);
^~~~
HelloWorld.cpp:59:5: note: suggested alternative:
In file included from /usr/include/c++/7/bits/char_traits.h:39:0,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/c++/7/bits/stl_algobase.h:479:5: note: ‘std::move’
move(_II __first, _II __last, _OI __result)
^~~~
HelloWorld.cpp:65:16: error: ‘maxSpeed’ was not declared in this scope
move.limit(maxSpeed);
^~~~~~~~
HelloWorld.cpp:68:23: error: too many arguments to function ‘long int random()’
shade += (random(2) - 1) ;
^
In file included from /usr/include/c++/7/cstdlib:75:0,
from /usr/include/c++/7/ext/string_conversions.h:41,
from /usr/include/c++/7/bits/basic_string.h:6361,
from /usr/include/c++/7/string:52,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/stdlib.h:401:17: note: declared here
extern long int random (void) __THROW;
^~~~~~
HelloWorld.cpp:69:27: error: invalid operands of types ‘float’ and ‘int’ to binary ‘operator%’
shade = (shade + 255) % 255; //max(0, min(255, shade));
~~~~~~~~~~~~~~^~~~~
HelloWorld.cpp: In member function ‘void Boid::getFriends()’:
HelloWorld.cpp:73:5: error: ‘ArrayList’ was not declared in this scope
ArrayList<Boid> nearby = new ArrayList<Boid>();
^~~~~~~~~
HelloWorld.cpp:73:19: error: expected primary-expression before ‘>’ token
ArrayList<Boid> nearby = new ArrayList<Boid>();
^
HelloWorld.cpp:73:21: error: ‘nearby’ was not declared in this scope
ArrayList<Boid> nearby = new ArrayList<Boid>();
^~~~~~
HelloWorld.cpp:73:34: error: ‘ArrayList’ does not name a type
ArrayList<Boid> nearby = new ArrayList<Boid>();
^~~~~~~~~
HelloWorld.cpp:73:48: error: expected primary-expression before ‘>’ token
ArrayList<Boid> nearby = new ArrayList<Boid>();
^
HelloWorld.cpp:73:50: error: expected primary-expression before ‘)’ token
ArrayList<Boid> nearby = new ArrayList<Boid>();
^
HelloWorld.cpp:74:24: error: ‘boids’ was not declared in this scope
for (int i =0; i < boids.size(); i++) {
^~~~~
HelloWorld.cpp:74:24: note: suggested alternative: ‘Boid’
for (int i =0; i < boids.size(); i++) {
^~~~~
Boid
HelloWorld.cpp:76:16: error: no match for ‘operator==’ (operand types are ‘Boid’ and ‘Boid*’)
if (test == this) continue;
~~~~~^~~~~~~
HelloWorld.cpp:77:20: error: ‘class Boid’ has no member named ‘pos’
if (abs(test.pos.x - this.pos.x) < friendRadius &&
^~~
HelloWorld.cpp:77:33: error: request for member ‘pos’ in ‘(Boid*)this’, which is of pointer type ‘Boid*’ (maybe you meant to use ‘->’ ?)
if (abs(test.pos.x - this.pos.x) < friendRadius &&
^~~
HelloWorld.cpp:77:42: error: ‘friendRadius’ was not declared in this scope
if (abs(test.pos.x - this.pos.x) < friendRadius &&
^~~~~~~~~~~~
HelloWorld.cpp:78:18: error: ‘class Boid’ has no member named ‘pos’
abs(test.pos.y - this.pos.y) < friendRadius) {
^~~
HelloWorld.cpp:78:31: error: request for member ‘pos’ in ‘(Boid*)this’, which is of pointer type ‘Boid*’ (maybe you meant to use ‘->’ ?)
abs(test.pos.y - this.pos.y) < friendRadius) {
^~~
HelloWorld.cpp:82:5: error: ‘friends’ was not declared in this scope
friends = nearby;
^~~~~~~
HelloWorld.cpp:82:5: note: suggested alternative: ‘fread’
friends = nearby;
^~~~~~~
fread
HelloWorld.cpp: In member function ‘float Boid::getAverageColor()’:
HelloWorld.cpp:88:23: error: ‘friends’ was not declared in this scope
for (Boid other : friends) {
^~~~~~~
HelloWorld.cpp:88:23: note: suggested alternative: ‘fread’
for (Boid other : friends) {
^~~~~~~
fread
HelloWorld.cpp: In member function ‘void Boid::draw()’:
HelloWorld.cpp:187:26: error: ‘friends’ was not declared in this scope
for ( int i = 0; i < friends.size(); i++) {
^~~~~~~
HelloWorld.cpp:187:26: note: suggested alternative: ‘fread’
for ( int i = 0; i < friends.size(); i++) {
^~~~~~~
fread
HelloWorld.cpp:189:7: error: ‘stroke’ was not declared in this scope
stroke(90);
^~~~~~
HelloWorld.cpp:189:7: note: suggested alternative: ‘stdout’
stroke(90);
^~~~~~
stdout
HelloWorld.cpp:192:5: error: ‘noStroke’ was not declared in this scope
noStroke();
^~~~~~~~
HelloWorld.cpp:193:5: error: ‘fill’ was not declared in this scope
fill(shade, 90, 200);
^~~~
HelloWorld.cpp:193:5: note: suggested alternative:
In file included from /usr/include/c++/7/bits/char_traits.h:39:0,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/c++/7/bits/stl_algobase.h:724:5: note: ‘std::fill’
fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
^~~~
HelloWorld.cpp:194:5: error: ‘pushMatrix’ was not declared in this scope
pushMatrix();
^~~~~~~~~~
HelloWorld.cpp:195:15: error: ‘pos’ was not declared in this scope
translate(pos.x, pos.y);
^~~
HelloWorld.cpp:195:5: error: ‘translate’ was not declared in this scope
translate(pos.x, pos.y);
^~~~~~~~~
HelloWorld.cpp:196:12: error: ‘move’ was not declared in this scope
rotate(move.heading());
^~~~
HelloWorld.cpp:196:12: note: suggested alternative:
In file included from /usr/include/c++/7/bits/char_traits.h:39:0,
from /usr/include/c++/7/ios:40,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from HelloWorld.cpp:1:
/usr/include/c++/7/bits/stl_algobase.h:479:5: note: ‘std::move’
move(_II __first, _II __last, _OI __result)
^~~~
HelloWorld.cpp:196:5: error: ‘rotate’ was not declared in this scope
rotate(move.heading());
^~~~~~
HelloWorld.cpp:196:5: note: suggested alternative: ‘rename’
rotate(move.heading());
^~~~~~
rename
HelloWorld.cpp:197:5: error: ‘beginShape’ was not declared in this scope
beginShape();
^~~~~~~~~~
HelloWorld.cpp:198:17: error: ‘globalScale’ was not declared in this scope
vertex(15 * globalScale, 0);
^~~~~~~~~~~
HelloWorld.cpp:198:5: error: ‘vertex’ was not declared in this scope
vertex(15 * globalScale, 0);
^~~~~~
HelloWorld.cpp:201:14: error: ‘CLOSE’ was not declared in this scope
endShape(CLOSE);
^~~~~
HelloWorld.cpp:201:5: error: ‘endShape’ was not declared in this scope
endShape(CLOSE);
^~~~~~~~
HelloWorld.cpp:201:5: note: suggested alternative: ‘unshare’
endShape(CLOSE);
^~~~~~~~
unshare
HelloWorld.cpp:202:5: error: ‘popMatrix’ was not declared in this scope
popMatrix();
^~~~~~~~~
HelloWorld.cpp: In member function ‘void Boid::wrap()’:
HelloWorld.cpp:211:5: error: ‘pos’ was not declared in this scope
pos.x = (pos.x + width) % width;
^~~
HelloWorld.cpp:211:22: error: ‘width’ was not declared in this scope
pos.x = (pos.x + width) % width;
^~~~~
HelloWorld.cpp:211:22: note: suggested alternative: ‘wcwidth’
pos.x = (pos.x + width) % width;
^~~~~
wcwidth
HelloWorld.cpp:212:22: error: ‘height’ was not declared in this scope
pos.y = (pos.y + height) % height;
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C++ is a widely used middle-level programming language.
When ever you want to perform a set of operations based on a condition If-Else is used.
You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to If-Else-If ladder.
For loop is used to iterate a set of statements based on a condition.
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.