it's ez

int isprim(int x);

void main()
{
int i;
for(i=1;i<20;i++)
{
if(isprim(i)==1) printf("%d,",i);
}

}


int isprim(int x)
{
int i;
for(i=2;i {
if(x%i==0)return 0;
}
return 1;
}

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