Hello Mayank,
First of all the selection of branch for engineering depends on your interest.You can't compare both the branch because both have there own field of work which is truely awesome.Mechanical engineering is all about design,construction and use of machine.After doing mechanical engineering you can go into automobile design and production.on the other hand CSE deals with testing, Programming,making web browsers,apps,websites using different languages.building software for design and many other purposes.
After the completion of course in mechanical engineering there are lots of opportunities in various fields of manufacturing,production,service and development.Here are some firms which requires mechanical engineers-Tata motors,bajaj,Hero,BHEL,ISRO and many more.In India,a student has cleared in mechanical engineering can get the offers started from 5 LPA to 20 LPA.On the other hand,after the completion of degree in CSE you can work in the field of database management,IT telecommunication,computer hardware and software implementation,gaming and web designing and many more.The reputed firms which requires software engineers are-TCS,Infosys,Wipro,HCL,Accenture and many more.you can get from 3 LPA upto 40 LPA working in different software companies.
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