CBSE Class 11 Computer Science Worksheet Set 07 Solved

1. Write the names of the header files to which the following functions belong:

i) islower( )    ii) strcpy( )

2. What are the formal parameters and actual parameters of a function? 

3. Write definition for a structure EREC that stores information about an employee such as empid, name, address and salary. The address member of EREC stores the information houseno, area and city.

4. How is call-by-value method of function invoking different from call-by-reference method?
Give appropriate examples supporting your answer.

5. Illustrate the use of #define in C++ to define a macro. 

6. Give the output of the following program:
#include
void Calc(int &X, int Y=200)
{int TEMP = X + Y;
X += TEMP;
if(Y != 200)
cout<}
int main()
{
int A=50, B=20;
Calc(B);
cout<Calc(B);
cout<return 0;
}

7. Write a program using functions to accept a string and a character in the main( ) function. Pass this string and the character to a function named check( ), check how many times the character is present in the string and display the result within the function check( ).

8. Define a structure customer with the following members : Idno, name, units and amount. Write a C++ Program to read Idno, name and number of units consumed for n customers and compute amount as per the following criteria :

Units               Amount

1 - 100        200 baiza per unit
101 -300     400 baiza per unit
> 300          500 baiza per unit

For example , if the units consumed is 350, then
amount = 100*0.200 + 200*0.400 + 50*0.500
Display Idno, name, number of units and total amount for n customers.

9. Write a program using functions to check whether a number is perfect or not. The function name is Perfect( ).The number is accepted within the function and result is displayed within the function.

VALUE POINTS 

1. i) ctype.h 
ii) string.h 

2. Formal parameters – parameters appear in the parameter list of function header. 
Actual parameters- parameters appear in the function call.

3. struct address 
{int houseno;
char area[26];
char city[26];
};
struct EREC - 1 mark
{
int empid;
char name[20];
address adr;
float salary;
};

4. Call by value method 

1. In this method, the values of actual parameters are copied into the formal parameters and the fn. Works with its own copy of values
2. The changes in the formal parameters will not be reflected into the actual parameters.
3. The main benefit of this method is that you cannot alter the variables that are used to call the fn. And the original copy of the argument value remains intact.
Any example 

Call by reference method 

1. In this method, the reference to the original values is passed in the fn.
2. The same value can now be accessed by the original variable name and the reference variable name.
3. Thus, the called fn. Does not create its own copy of the original values, rather it refers to the original values with different names.
4. Thus any change with the data in the fn. Is reflected back in main().
Any example

5. Macro: A macro is a single line function with or without arguments. A macro without arguments is treated like a symbolic constant. A macro with arguments has its arguments substituted for replacement text when macro is expanded.

A macro substitutes text only and does not check for datatypes.

e.g. #define SQUARE(X) X * X
void main()
{
---
cout<}
O/P 25
- 1 mark explanation
- 1 mark example

6. Output:
50240
50680
- 1 mark for each correct line

7. for declaration & input statements 
for correct logic
for displaying

8. for declaration & input statements 
for correct logic
for displaying 

9. for declaration & input statements 
for correct logic 
for displaying

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