Explain difference between while and do-while loop.

The syntax of while loop is

while(expression)
{
statement;
statement;
}


the syntax of do while loop is

do
{

statement;
statement;
}
while(expression);


From the above syntax it is clear that in while loop expression is tested first and then the body is executed.
If expression is evaluated to true it is executed otherwise not.


In do while loop, body is executed first and then the expression is tested. If test expression is evaluated to true then body of loop is again executed.

Thus it is clear that the body of do while loop gets executed at least once, where as, it is not necessary in while loop.

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History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming
language.

My 1st Program...


#include
#include
void main ()
{
clrscr ();
printf ("\n\n\n\n");
printf ("\t\t\t*******Pankaj *******\n");
printf ("\t\t\t********************************\n");
printf ("\t\t\t\"Life is Good...\"\n");
printf ("\t\t\t********************************");
getch ();
}

Next Step...


#include
#include

void main ()
{
clrscr ();
printf ("\n\n\n\n\n\n\n\n");
printf ("\t\t\t --------------------------- \n\n");

printf ("\t\t\t | IGCT, Info Computers, INDIA | \n\n");
printf ("\t\t\t --------------------------- ");

getch ();

}

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