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Worksheet for Class 12 Informatics Practices Commonly Used Libraries
Class 12 Informatics Practices students should refer to the following printable worksheet in Pdf for Commonly Used Libraries in Class 12. This test paper with questions and answers for Class 12 will be very useful for exams and help you to score good marks
Class 12 Informatics Practices Worksheet for Commonly Used Libraries
CHAPTER 6: COMMONLY USED LIBRARIES
Libraries: It is a set of ready-made software routines that can be reused in new programs. Libraries are made available in a program using import statement e.g. import java.io.*; String Library: It is a part of java language library java.lang, which is by default imported to the program. There are 3 classes to work with characters:
(i) Character Class whose instances can hold single character data.
(ii) String Class whose instances can hold unchanging string. Every time we change, a new object is created automatically.
String s = “Excellent” ; or String s = new String(“Excellent”);
(iii) StringBuffer Class whose instances can hold mutable strings.
StringBuffer sb = new StringBuffer(); or StringBuffer sb = new StringBuffer(“First”); or
StringBuffer sb = new StringBuffer(10); // to hold 10 characters
String s = "crack", r = "rack";
Additional stringBuffer Methods:
| Method Prototype | Description |
| append(x) reverse() | Adds x char at the end. sb.append(r); =>> artscience sb.reverse(); =>> ecneicstra |
Math Functions: It is found in Math library and used as Math.sqrt(a*a + b*c)
| Function | Action | Function | Action | Function | Action |
| pow(x,y) | Xy | ceil(x) | Round up | floor(x) | Round down |
| sqrt(x) | Root | abs(a) | Absolute | max(a,b), min(a,b) | Max, min |
round(x): Rounds off a number to its nearest integer. It argument is double then it returns long and for float it returns int. If the argument is NaN, then the result is zero. Round(-4.5) is -4. Round(4.5) is 5. (NaN means Not a Number).
Sample Questions:
1. What will be display in a jTextField1 after executing the following code?
int m= 16; m=m+1;
if (m<15) jTextField. setText(Integer.toString(m)); else
jTextField1.setText(Integer.toString(m+15));
2. What does round() return if a negative float value is passed to it?
3. Write code to display IP 12 CBSE in a dialog box (JOptionPane).
4. What will be the output of the following code: (i) Math.round(1.5) (ii) “Welcome”.toUpperCase().
5. What will be the value X1 after the execution of the following code ?
String X1= "Graduate" ,X2="Post" ; X1=X2. concat (X1) ;
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CBSE Class 12 Informatics Practices Commonly Used Libraries Worksheet
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Worksheet for Informatics Practices CBSE Class 12 Commonly Used Libraries
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Commonly Used Libraries worksheet Informatics Practices CBSE Class 12
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Commonly Used Libraries CBSE Class 12 Informatics Practices Worksheet
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Worksheet for CBSE Informatics Practices Class 12 Commonly Used Libraries
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