10th Class Computer Science Chapter 3 Input and Output Handling Short Questions Answer
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10th Class Computer Science Chapter 3 Input and Output Handling Short Questions Answer
ERR When an error occurs its code is assigned to a special variable named ERR.
Transfer of control transfers the flow of execution of a program from one part of the program to another part there are two types of transfer of control
Conditional Transfer of Control
Unconditional Transfer of Control
The conditional transfer of control causes the switching of the control from one part of the program to the other depending on a certain condition GOTO n1,n2,n3
Selection structure decide which substitute program is to be executed In GW-BASIC we use the IF THEN and IF THEN ELSE statements to apply selection structure.
The unconditional transfer of control transfers the control from one part of the program to the other without any condition In this unconditional transfer of control the program control switches to a specific line by skipping one or more lines without any condition.
This command enables error trapping feature of GW-BASIC and specify the first line of error handing routine.
There are three types of control structure these care sequence selection and loop.
The IF-THEN-ELSE statement is a decision making statement as it decides the path of the program It helps in making comparison and testing whether a condition is true or not.
In Sequence structure instruction are executed according to the increasing order of their line number.
The Syntax of ON GOTO expression GOTO n1,n2,n3
Interpretation:
The expression is a valid BASIC expression and n1,n2,n3 are the valid number in the program where the control will be transferred. The range of value of numeric variable or expression is 0 to 255
This is useful where the programmer does not know in advance how many times the loop will be executed.
GOTO statement is used to unconditionally transfer control from a program line to specific line without of the normal program sequence.
A selection structure chooses which alternative program statement to execute.
There are three types of loop.
i. FOR …………… NEXT LOOP.
ii. WHILE…………. WEND LOOP
iii. NESTED LOOP
Control of Iteration: Loop statements are used to control iteration in Basic language for this purpose FOR NEXT and WHILE WEND loop structures are used.
Control structure control the flow of execution of a program.
In unconditional transfer of control the program control switches to a specific line by skipping one or more lines without any condition.
When an error occurs its code is assigned a unique code to a special variable named ERR.
There are three types of control structure in BASIC
1. Sequence structure
2. Selection structure
3. Loop
There are three logical operator AND, OR, NOT.
1. If expression THEN statement
2. If expression then line number
This is useful where the programmer does not know in advance how many times the loop will be executed.
1. INPUT AGE A
2. IF A THEN 30 ELSE
3. PRINT Candidate eligible
4. GOTO 60
5. PRINT Candidate is not eligible
6. INPUT Would you like to input again
We often face problem whose solution may require executing a set of statement repeatedly in such situation we use loop structure.
The keyword ELSE is used to specify two different alternative with IF statement.
10 CLS
20 INPUT Enter the value of Table …..T
25N=1
30 while N =10
40 RES= T*N
50 Print t x n RES
60 N=N+1
70 WEND
80 END
10 CLS
20 INPUT Enter R of circle
30 Area = 3.14 r*r*
40 CIRCUM = 2*3.14
50 PRINT Area of the circle Area
60 PRINT Circumference of circle CIRCUM
70 END
10 CLS
20 INPUT Enter the base of the triangle base
30 INPUT Enter the altitude of the triangle altitude
40 Area base altitude
50 PRINT Area of Triangle
60 END
A condition is an expression that either evaluates to true or false.
