Structures Files

8/2/2019 Structures Files

1/6

CSE180 Computer Programming in C Lab

Structures & Files

1. Create a structure to specify data of customers in a bank. The data to be stored

is: Account no, Name and balance in the account.

a) Write a function to print the account number and name of each customer

whose balance below Rs 2000

b) Write a function to accept the account no and amount from the customer

and perform a withdrawal or deposit and print the customer information

along with the new balance.

2. Create a structure employee that holds information like employee code, name,and date of joining and salary of employees. Write a program to create array of

structures and enter data to it. Pass the array to a function and return the

employee information highest paid employee. (Pass array of structures to

function and return structure)

3. Write a function to accept n students record and to return the records of a

student with highest CGPA. Each record has the name, regno, branch and

and CGPA as fields. (Pass array of structures to function and return a record)

4. Write a program to read employee records from a file using structures and

display on the screen. Also display the total count of characters, spaces and

numbers in the file.

5. Write a program to append the contents of one text file at the end of another.

Answer the following questions.

6. Use the following code segment to answer the following questions


2/6


Structures & Files

/* mult.c */

int main( int argc , char *argv[] )

{int i , j , w , h ;

if( argc != 3 )

{

printf("usage: %s width height\n",argv[0]);

return 1;

}

w = atoi( argv[1] ) ;

h = atoi( argv[2] ) ;

for( i = 1 ; i


3/6


Structures & Files

Suppose this program were executed using the command:

./mul 15w 10h

Which of the following statements are true about the output of the program?

a.There is no output.

b. One hundred fifty numbers are printed.

c. The number at the bottom right of the printout is 150.

d. The thirtieth number printed is 30.

Modify the above program to find the product of n nos.

7. Show the output and answer the questions for the following program.

// start of structure definition

struct Song

{

char Name[25];

float Length;

}; // end of structure definition

// function prototype, receives and returns structure

data type

struct Song ZeroOut(struct Song);


4/6


Structures & Files

int main(){

struct Song Title1 = {"White room", 2.50}, Title2;

Title2 = ZeroOut(Title1);

printf("1: %s, %.2f\n", Title1.Name,

Title1.Length);

printf("2: %s, %.2f\n", Title2.Name,

Title2.Length);

}

// beginning of function definition

struct Song ZeroOut(struct Song x)

{

struct Song y = {"Have Mercy On Me", 3.20F};

strcpy_s(x.Name, 25, " ");

x.Length = 0;

return y;

} // end of function definition

a) The structure is not defined inside any function. If it were defined inside the

main() function, as was done in the previous exercises, will this program

work? Why or why not?

b) As shown in the program, the definition of the structure is global, that is, it is

available to all functions. Title1 in main() becomes what variable in

ZeroOut()?


5/6


Structures & Files

c) ZeroOut() erased the contents of what was provided through the variable

Title1. Were the contents of Title1 also erased when control went back to

main()?

d) When passing a structure variable to a function, can that function change its

contents?

e) Do functions make copies of structures like they make copies of scalars?

f) Do functions receive only addresses of structures, as they do of arrays?

g) Let us now consider how functions return structures. What is the data type

that ZeroOut() returns?

h) What variable is returned by ZeroOut()? What is its data type? What are its

values?

i) Which variables in main() accepts the returned structure from ZeroOut()?

j) Were the values returned by ZeroOut() received in main()? If so, then into

which variable?

8. Here is the declaration for struct contract; union aptinfo holds information

pertinent to renting, leasing or purchasing an apartment, in that order. The

member how_held, which can have values RENT, LEASE or PURCHASE,

determines which alternative is active.

#define RENT 1

#define LEASE 2

#define PURCHASE 3

struct leaseinfo{

double monthly_lease;

int lease_period;


6/6


Structures & Files

};

struct contract{

int how_held;

union aptinfo{

double monthly_rent;

struct leaseinfo lease;

double price;

}monetary;

}apartment;

a) Draw a diagram of the structure apartment, showing the possibilities for

union monetary.

b) How is structure different from union?

c) Write statements to give values to the fields appropriate for leasing the

apartment referred to by structure apartment.

d) Write an if statement that prints whichever fields of union monetary are

active, based on the value of the member how_held.

Structures Files

Documents

Transcript of Structures Files