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49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* Prime number - Program to print prime numbers from 1 to n or between 1 and n or till n */
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/* Assume 2 is a prime number but 0 and 1 are not */
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#include <stdio.h>
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#include <conio.h>
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void main()
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{
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int n, p, d, flag ;
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clrscr() ;
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printf("Enter n: ") ;
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scanf("%d", &n) ;
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printf("Prime numbers till %d are as shown: \n", n) ;
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for(p=2 ; p<=n ; p++)
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{
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flag=1 ; /* Assuming p is prime */
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for(d=2 ; d<=p-1 ; d++) /* d<=p/2 is also correct */
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if(p%d==0) /* True if number is not prime */
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{
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flag=0 ;
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break ; /* Inner Loop terminates if p is not prime */
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}
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if(flag==1)
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printf("%d ", p) ;
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}
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getch() ;
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}
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/*
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A Similar Program could be:
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Program to read two natural numbers r1 and r2 where r2>r1 and generate all prime numbers between r1 and r2 both inclusive.
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*/
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/*
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Output 1:
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Enter n: 13
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Prime numbers till 13 are as shown:
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2 3 5 7 11 13
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Output 2:
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Enter n: 14
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Prime numbers till 14 are as shown:
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2 3 5 7 11 13
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*/
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