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Hi Shubham Tohake , Welcome in Sololearn
Variable names in C++ can range from 1 to 255 characters. All variable names must begin with a letter of the alphabet or an underscore(_). Variable names are case sensitive. No spaces or special characters are allowed. You cannot use a C++ keyword (a reserved word) as a variable name
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As you are new here, read the guidelines - https://www.sololearn.com/Discuss/1316935/?ref=app
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Rishav Tiwari