Code, Pointers - Introduction to Programming - Lecture Slides, Slides of Computer Programming

Download Code, Pointers - Introduction to Programming - Lecture Slides and more Slides Computer Programming in PDF only on Docsity! Introduction to Programming Lecture 14 Docsity.com Code calculateSalary ( int sal [ ] [ 2 ] , int lucky [ ] , int numEmps ) { for ( i = 0 ; i < numEmps ; i ++ ) { // netSalary = grossSalary – tax if ( sal [ i ] [ 0 ] <= 5000 ) { sal [ i ] [ 1 ] = sal [ i ] [ 0 ] ; } Docsity.com Code else { sal [ i ] [ 1 ] = sal [ i ] [ 0 ] - 0.15 * sal [ i ] [ 0 ] ; } } } } Docsity.com if ( sal [ i ] [ 0 ] >= 0 && sal [ i ] [ 0 ] <= 5000 ) { sal [ i ] [ 1 ] = sal [ i ] [ 0 ] ; } if ( sal [ i ] [ 0 ] > 5000 && sal [ i ] [ 0 ] < 10000 ) { sal [ i ] [ 1 ] = sal [ i ] [ 0 ] - 0.05 * sal [ i ] [ 0 ] ; } ... … … Docsity.com if ( grossSalary > sal [ i ] [ 0 ] && netSalary < sal [ i ] [ 1 ] ) This logic will fail Docsity.com Pointers Docsity.com Pointers 10 x 60000 Location Address of x Docsity.com Declaring Pointer to Integer int *myptr ; myptr is pointer to an integer Docsity.com Dereferencing Operator * *ptr is read as “The value of what ever ptr points to” Docsity.com z = *ptr * 2 ; Docsity.com Initializing Pointers ptr = &var ; ptr = 0 ; ptr = NULL ; 0 and NULL points to nothing Docsity.com Declaring pointers int *ptr , x ; Docsity.com Declaring pointers int *ptr , x , a [ 10 ] ; Docsity.com Bubble Sort 5 1 3 6 9 2 4 8 1 5 3 6 4 8 2 9 3 1 6 5 4 2 9 8 4 3 2 1 6 5 9 8 Docsity.com Example main ( ) { int x = 10 , y = 20 , * yptr , * xptr ; yptr = &y ; xptr = &x ; swap ( yptr , xptr ) ; } Docsity.com Example swap ( int *yptr , int *xptr ) { … … … } Docsity.com const int *const myptr = &x ; myptr is a constant pointer to an integer Docsity.com