A student writes several functions to swap the values of the two variables x and y, i.e. if x=1 and y=2, after calling the swap function x=2 and y=1. The different functions that the student writes are given below:def swap1(x,y) : x=y y=x return(x,y) def swap2(x,y) : return(y,x) def swap3(x,y) : z=x x=y y=z return(x,y) def swap4(x,y) : x,y=y,x return(x,y) Which of the functions swap1, swap2, swap3, and swap4 is correct?Functions swap3, and swap4 onlyFunctions swap2, swap3, and swap4 onlyFunction swap1 onlyFunctions swap1, swap2, and swap3 only

Answered: def swap1(x,y) : x=y y=x…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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A student writes several functions to swap the values of the two variables x and y, i.e. if x=1 and y=2, after calling the swap function x=2 and y=1. The different functions that the student writes are given below:

def swap1(x,y) :
x=y
y=x
return(x,y)
def swap2(x,y) :
return(y,x)
def swap3(x,y) :
z=x
x=y
y=z
return(x,y)
def swap4(x,y) :
x,y=y,x
return(x,y)

Which of the functions swap1, swap2, swap3, and swap4 is correct?

Functions swap3, and swap4 only
Functions swap2, swap3, and swap4 only
Function swap1 only
Functions swap1, swap2, and swap3 only

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