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  1. #include <stdio.h>
  2.  
  3. // Helper function to check prime
  4. int isPrime(int num) {
  5.     if (num < 2) return 0;
  6.     int i;
  7.     for (i = 2; i * i <= num; i++) {
  8.         if (num % i == 0)
  9.             return 0;
  10.     }
  11.     return 1;
  12. }
  13.  
  14. // Function to calculate sum of primes less than n
  15. int sumPrime(int n) {
  16.     int i, sum = 0;
  17.     for (i = 2; i < n; i++) {
  18.         if (isPrime(i))
  19.             sum += i;
  20.     }
  21.     return sum;
  22. }
  23.  
  24. int main() {
  25.     int n;
  26.     printf("Enter n: ");
  27.     scanf("%d", &n);
  28.     printf("Sum of primes less than %d = %d\n", n, sumPrime(n));
  29.     return 0;
  30. }
Success #stdin #stdout 0s 5316KB
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stdin
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10
stdout
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Enter n: Sum of primes less than 10 = 17
https://ideone.com/tJJsxn
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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