Why is the output of these 2 programs not same-CodePudding

I am trying to find the numbers that are not divisible by 3,5,7 and counting them And printing the ones that are divisible

The two approaches are

#include <stdio.h>
int main()
{
   int count=0;
   
   for(int i = 1; i<=500;i  )
   {
       if(i%3==0 && i%5==0 && i%7==0) {
            printf("%d \n", i);
       }
       else {
           count  ;
       }
   }
    printf(" the count is : %d \n", count);
}

/*
WAP to count the numbers from (1-500) which are not divisible by 3, 4 and  
*/
#include <stdio.h>
int main()
{
    int count=0;
    
    for(int i = 1; i<=500;i  )
    {
        if(i%3!=0 && i%5!=0 && i%7!=0) {
            count  ;
        }
        else {
            printf("%d \n", i);
        }
    }
     printf(" the count is %d \n", count);
}

The problem is that the output should be same but it is not

CodePudding user response：

Because these two if statements are not opposite from each other. The negation from

if(i%3==0 && i%5==0 && i%7==0)

would be

 if(!(i%3==0 && i%5==0 && i%7==0))

which changes equals to not equals, but also changes ANDs to ORs. So the second code should have something like this

if(i%3!=0 || i%5!=0 || i%7!=0)