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  1. //Q55. Write a program to print all the prime numbers from 1 to n
  2. #include <stdio.h>
  3.  
  4. int main() {
  5.     int n;
  6.     printf("Enter n: ");
  7.     scanf("%d", &n);
  8.  
  9.     for (int i = 2; i <= n; i++) {
  10.         int prime = 1;
  11.         for (int j = 2; j * j <= i; j++) {
  12.             if (i % j == 0) {
  13.                 prime = 0;
  14.                 break;
  15.             }
  16.         }
  17.         if (prime) printf("%d ", i);
  18.     }
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5320KB
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10
stdout
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Enter n: 2 3 5 7
https://ideone.com/HVxuji
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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