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    Partial differential equation problem

    Homework Statement using the method of separation of variables, solve ∂u/∂x=4∂u/∂y, where u=3e^-y - e^-5y when x=0. Homework Equations The Attempt at a Solution let u(x,y)=X(x)Y(y) =XY. Homework Statement Homework Equations The Attempt at a Solution...
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    Explain this program.

    #include<stdio.h> void main() { char c[]="gate2011"; char *p=c; printf("%s",p+p[3]-p[1]); }
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    What is the use of mutable keyword in cpp?

    how does mutable keyword functions in cpp. what are it's applications. do using 'mutable' keyword is preferable?.
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    Problem:two standard users, no administrator! how to solve?.help.

    guys, there are two users in my system which are 'standard user' and no one is 'administrator'. now the problem is that when i am installing any software then it's asking to type an administrator password and then press 'yes'. but there is no blank to type any password and the yes option is...
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    What is the difference between structure and enum?.

    or else what is the difference between structure,union and enum. can anyone please provide the exact information about them.
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    What is $recycle.bin? it has appeared in all the drives of the system.

    how to remove this from all the drives, help.