Passion for Programming

* Smart pointer classes are defined in <memory> header, so we need to include "memory" header to use smart pointers. * The header gives access to three template based smart pointers each with unique features. * We get "unique_ptr", "shared_ptr", "weak_ptr" *  Unique pointer are type of smart pointers that can’t be copied.std::unique_ptr is a smart pointer that owns and manages another object through a pointer and disposes of that object when the unique_ptr goes out of scope. *  Shared pointer is much like “unique_prt” but we can make copies of it. *  Weak pointer is a special case of shared pointer. Weak pointer helps in breaking circular references.Destruction using weak pointer will not care about destruction of other objects referenced from this present object under destruction.

#define LEFT 13 #define RIGHT 12 #define PATH_DURATION1 5000 #define PATH_DURATION2 1000 #define PATH_DURATION3 500 // the setup function runs once when you press reset or power the board void setup() {   // initialize digital pin LED_BUILTIN as an output.   pinMode(LEFT, OUTPUT);    pinMode(RIGHT, OUTPUT); } // the loop function runs over and over again forever void loop() {   moveStraight();   delay(PATH_DURATION1);          moveRight();   delay(PATH_DURATION2);        moveStraight();   delay(PATH_DURATION1);   moveLeft();   delay(PATH_DURATION2); } void moveStraight(){   digitalWrite(LEFT, HIGH);   digitalWrite(RIGHT,HIGH);           // turn the LED on (HIGH is the voltage level) } void moveRight(){   digitalWrite(LEFT,HIGH);   digitalWrite(RIGHT,LOW); } void moveLeft(){   digitalWrite(LEFT,LOW);   digitalWrite(RIGHT,HIGH); }

struct exam{ int a; char *ch; }st[]={10,"Testing",11,"Computer",12,"Science",13,"Engineering",14,"Custo",15,"2018"}; int main() { struct exam *e = st; printf("%s, ",e++->ch); ++e; printf("%s, ",++e->ch);   // -> operator has higher precedence than the ++ opearator. printf("%s, ",++e++->ch); printf("%d, ",e[0].a); printf("%s",++e->ch); return 0; } OUTPUT : Testing, cience, ience, 13, ngineering

int main(int argc, char** argv) { char p[3][4]={{'R','B','R','a'},{'S','R','K','a'},{'A','P','J','a'}}; printf("%d\n",p); //Prints 7339584 printf("%d",p+1); //Prints 7339588 , i.e there is an addition of 4 to the previous number return 0; } int main(int argc, char** argv) { char p[3][3]={{'R','B','R'},{'S','R','K'},{'A','P','J'}}; printf("%d\n",p); //Prints 7339584 printf("%d",p+1);//Prints 7339583 return 0; } _________________________________________________________________________________ int main(int argc, char** argv) { char p[3][2]={{'R','A'},{'S','R'},{'A','P'}}; printf("%c",*(p+1)); //Prints B return 0; } int main(int argc, char** argv) { char p[3][3]={{'R','B','R