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Introduction to Programming

Lecture 14

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 ] ; }

Code

else

{

if ( sal [ i ] [ 0 ] <= 20000 ) { sal [ i ] [ 1 ] = sal [ I ] [ 0 ] - 0.1 * sal [ I ] [ 0 ] ; }

Code

else

sal [ i ] [ 1 ] = sal [ i ] [ 0 ] - 0.15 * sal [ i ] [ 0 ] ;

if ( grossSalary > sal [ i ] [ 0 ] && netSalary < sal [ i ] [ 1 ] )

This logic will fail

Code

void locateUnluckyIndividual ( int sal [ ] [ 2 ] , int lucky [ ] , int numEmps ) { int i , j ; int grossSalary , netSalary ; for ( i = 0 ; i < numEmp ; i ++ ) { grossSalary = sal [ i ] [ 0 ] ; netSalary = sal [ i ] [ 1 ] ; for ( j = 0 ; j < numEmp ; j ++ ) { if ( grossSalary > sal [ j ] [ 0 ] && netSalary < sal [ j ] [ 1 ] ) { lucky [ i ] = 1 ; } } } }

Pointers

Pointers

10

x

60000

Location

Address of x

Declaring Pointers

double *x ;

char *c ;

Example

int *ptr ;

int x ;

x = 10 ;

ptr = &x ;

z = *ptr * 2 ;

Initializing Pointers

ptr = &var ;

ptr = 0 ;

ptr = NULL ;

0 and NULL points to nothing

Declaring pointers

int *ptr1 , *ptr2 , *ptr3 ;

Declaring pointers

int *ptr , x ;