Record: Find the prime number between 1 and 100

Train of Thought Analysis:1) First, determine the number of prime numbers. A prime number is a number that can be divisible by 1 and itself, but cannot be divisible by a number smaller than 1;

2) 2 is the smallest prime number and the only prime number that can be divisible by 2;

3) All the even numbers except 2 are not prime numbers.

In C #, we usually write the following program:

// Find the prime number between 1 and 100.

Console. Write (2 + "");

For (int x = 3; x <= 100; x + = 2) // if it is an even number, do not consider

{

Bool flag = true; // The dozens of prime numbers to be judged by default

If (x % 2 = 0)

{

Flag = false;

}

Else

{

For (int I = 3; I <x/2; I + = 2)

{

If (x % I = 0)

{

Flag = false;

Break;

}

}

}

If (flag = true) // the number currently determined is indeed a prime number.

{

Console. Write (x + ""); // Add a space to the end of x.

}

}

Console. WriteLine ();

For many masters, this may be as simple as "1 + 1 = 2", but for a beginner like me, I have to worry about it! Come on, Ajax girl! 650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131228/20362V3R-0.gif "/>

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