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  1. #include <stdio.h>
  2.  
  3. int is_prime(int n);
  4. float even_average(int a[], int n);
  5.  
  6. int main()
  7. {
  8.    int n, i, count=0;
  9.    scanf("%d", &n);
  10.    int a[n];
  11.  
  12.    for(i=0; i<n; i++)
  13.    {
  14.       scanf("%d ", &a[i]);
  15.    }
  16.    for(i=0; i<n; i++)
  17.    {
  18.       int prime = is_prime(a[i]);
  19.       if(prime)
  20.          count++;
  21.    }
  22.  
  23.    float avg = even_average(a, n);
  24.  
  25.    printf("Prime numbers: %d\n", count);
  26.    printf("Average of all positive integers: %.2f\n", avg);
  27.  
  28.    return 0;
  29. }
  30.  
  31. int is_prime(int n)
  32. {
  33.    int i;
  34.  
  35.    if(n==1)
  36.       return 0;
  37.    else
  38.    {
  39.       for(i=2; i<=n/2; i++)
  40.       {
  41.          if(n%i == 0)
  42.             return 0;
  43.       }
  44.       return 1;
  45.    }
  46. }
  47.  
  48. float even_average(int a[], int n)
  49. {
  50.    int i, sum=0, flag=0;
  51.    float avgg;
  52.  
  53.    for(i=0; i<n; i++)
  54.    {
  55.       if(a[i]%2==0)
  56.       {
  57.          sum += a[i];
  58.          flag++;
  59.       }
  60.    }
  61.    avgg = sum/flag;
  62.    return avgg;
  63. }
Success #stdin #stdout 0s 5444KB
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stdin
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5
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stdout
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Prime numbers: 3
Average of all positive integers: 8.00
https://ideone.com/xY3R9e
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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