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C Exercise Example 36 - Find Prime Numbers Within 100

C Language Classic 100 Examples

Topic: Find prime numbers within 100.

Program Analysis: A prime number, also known as a质数 (prime number), is infinite. A natural number greater than 1 that is not divisible by any other natural number except 1 and itself.

Program Source Code:

Example

//  Created by www.tutorialpro.org on 15/11/9.
//  Copyright © 2015年 tutorialpro.org. All rights reserved.
//

#include<stdio.h>
#include<math.h>
int main()
{
    int i,j,k,n=0;
    for(i=2;i<=100;i++)
    {
        k=(int)sqrt(i);
        for(j=2;j<=k;j++)
            if(i%j==0) break;
        if(j>k)
        {
            printf("%d ",i);
            n++;
            if(n%5==0)
                printf("\n");
        }
    }
    return 0;
}

The output of the above example is:

2 3 5 7 11 
13 17 19 23 29 
31 37 41 43 47 
53 59 61 67 71 
73 79 83 89 97

C Language Classic 100 Examples

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