Computer Applications

A student is trying to convert the string present in x to a numerical value, so that he can find the square root of the converted value. However the code has an error. Name the error (syntax / logical / runtime). Correct the code so that it compiles and runs correctly.

String x= "25";
int y=Double.parseDouble(x); 
double r=Math.sqrt(y); 
System.out.println(r);

Java Library Classes

ICSE Sp 2025

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Answer

Syntax error in the line:
int y=Double.parseDouble(x);

Corrected code:

String x= "25";
double y=Double.parseDouble(x); //int changed to double
double r=Math.sqrt(y); 
System.out.println(r);

Explanation:

The error is a syntax error because the method Double.parseDouble(x) returns a double, but the code is trying to assign it to an int variable without proper casting, which is not allowed in Java.

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Predict the output of the following code snippet:

char ch='B',
char chr=Character.toLowerCase(ch); 
int n=(int)chr-10; 
System.out.println((char)n+"\t"+chr);

View Answer

Consider the following program segment and answer the questions below:

class calculate

{
  int a; double b; 
  calculate()

  {

  a=0; 
  b=0.0;

  }

  calculate(int x, double y)

  {

  a=x;
  b=y;

  }

void sum()

{

  System.out.println(a*b);

}}

Name the type of constructors used in the above program segment?