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Write the proposed program in Java, JavaScript, and Python. Run them and compare the results. Submit...

Write the proposed program in Java, JavaScript, and Python. Run them and compare the results. Submit source code for 3 programs.

Let the function fun be defined as

int fun(int* k) {
 *k += 4;
 return 3 * (*k) - 1;
 }

Suppose fun is used in a program as follows:

void  main() {
  int i = 10, j = 10, sum1, sum2;
  sum1 = (i / 2) + fun(&i);
  sum2 = fun(&j) + (j / 2);
}
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Answer #1

python,java,java script didn't have call by reference.they only have call by value.only c have call by reference.these are done through pointers.pointers concept is not there in python,javascript,java.

only c and cpp have pointers concept.

c code:source.c

#include<stdlib.h>
int fun(int* k){
   *k+=4;
   return 3*(*k)-1;
}
void main(){
   int i=10,j=10,sum1,sum2;
   sum1=(i/2)+fun(&i);
   sum2=fun(&j)+(j/2);
   printf("%d\n",sum1);
   printf("%d\n",sum2);
}

#output:

C:Users\vishnu\Desktop 1.exe 46 48 Process exited after 0.09085 seconds with return value 3 Press any key to continue

when passing &j to a function fun.if the reference variable is change the j value also change.this is call by reference concept.

the function return 41 and we need add(j/2).here j as 14 because in function  k+=4 it means k=10+4 so it was reference so

j value as 14 so 14/2=7

so the sum2 have 41+7=48

in sum1 initially (i/2) so i value is 10.that's why 10/2=5 and the function return 41 so 41+5=46

so output

sum1=46

sum2=48

But while we are using python,javascript,java didn't have call by reference that's why we get the same output

sum1=46

sum2=46

python source code: source.py

def fun(k):
   k+=4
   return (3*k)-1;
i=10;j=10;sum1=sum2=0
sum1=(i/2)+fun(i);
sum2=fun(j)+(j/2)
print(sum1)
print(sum2)

#output:

\Users\vishnu\Desktop>pyt hon 1.py 46.0 46.0 c: \Users\vishnu\Desktop>

#java source code : Source.java

import java.util.*;
import java.lang.*;
class Source{
   int fun(int k){
           k+=4;
           return (3*k)-1;
       }
   public static void main(String args[]){
       Source ob=new Source();
       int i=10;
       int j=10;
       int sum1=0;
       int sum2=0;
       sum1=(i/2)+ob.fun(i);
       sum2=ob.fun(j)+(j/2);
       System.out.println(sum1);
       System.out.println(sum2);
   }
}

#output:

C-Command Prompt EC: \Users\vishnu\Desktop>javac Source.java C: \Users\vishnu\Desktop>java Source 46 246 C: \Users\vishnu\Des

#java script source code: source.html

here i write javascript code within html tags to get the output display on browser

<html>
<body>
<script>
function fun(k){
k+=4;
return (3*k)-1;
}
var i=10;
var j=10;
var sum1=0;
var sum2=0;
sum1=(i/2)+fun(i);
sum2=fun(j)+(j/2);
alert(sum1+"\n"+sum2);
</script>
</body>
</html>

#output:

This page says 46 46 OK

#if you have any doubts comment below.....

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