int isprime(int n){int i;for(i=2;i<=sqrt(n);i++)if(n%i==0)return 0;return 1;} int main(){ int i,j,s=0;for(i=3;i<=100;i+=2)if(isprime(i)){printf("%4d",i);if(++s%10==0)printf("\n");} getch();return 0;} ...