Pointer and Stack
Water Billing System
a.) Description
A billing system is a combination of software and hardware that receives call detail and service usage information, groups this information for specific accounts or customers, produces invoices, creates reports for management, and records (posts) payments made to customer accounts.
b.) Related Studies a.) Sites : Pointers http://www.tutorialspoint.com/cprogramming/c_quick_guide.htm A pointer is a variable whose value is the address of another variable ie. direct address of the memory location. Like any variable or constant, you must declare a pointer before you can use it to store any variable address. The general form of a pointer variable declaration is:
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type *var-name;
Here, type is the pointer's base type; it must be a valid C data type and var-name is the name of the pointer variable. The asterisk * you used to declare a pointer is the same asterisk that you use for multiplication. However, in this statement the asterisk is being used to designate a variable as a pointer. Following are the valid pointer declaration:
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int *ip; /* pointer to an integer */
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double *dp; /* pointer to a double */
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float *fp; /* pointer to a float */
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char *ch /* pointer to a character */
The actual data type of the value of all pointers, whether integer, float, character, or otherwise, is the same, a long hexadecimal number that represents a memory address. The only difference between pointers of different data types is the data type of the variable or constant that the pointer points to. b.) Books : Problem Solving And Problem Design in C, Hanly & Koffman, 1996
a.) Description
A billing system is a combination of software and hardware that receives call detail and service usage information, groups this information for specific accounts or customers, produces invoices, creates reports for management, and records (posts) payments made to customer accounts.
b.) Related Studies a.) Sites : Pointers http://www.tutorialspoint.com/cprogramming/c_quick_guide.htm A pointer is a variable whose value is the address of another variable ie. direct address of the memory location. Like any variable or constant, you must declare a pointer before you can use it to store any variable address. The general form of a pointer variable declaration is:
-------------------------------------------------
type *var-name;
Here, type is the pointer's base type; it must be a valid C data type and var-name is the name of the pointer variable. The asterisk * you used to declare a pointer is the same asterisk that you use for multiplication. However, in this statement the asterisk is being used to designate a variable as a pointer. Following are the valid pointer declaration:
-------------------------------------------------
int *ip; /* pointer to an integer */
-------------------------------------------------
double *dp; /* pointer to a double */
-------------------------------------------------
float *fp; /* pointer to a float */
-------------------------------------------------
char *ch /* pointer to a character */
The actual data type of the value of all pointers, whether integer, float, character, or otherwise, is the same, a long hexadecimal number that represents a memory address. The only difference between pointers of different data types is the data type of the variable or constant that the pointer points to. b.) Books : Problem Solving And Problem Design in C, Hanly & Koffman, 1996