Huge Prime in C Program

Huge prime(Huge n){
    Huge j;
    for (j=2;j<=n/2;j++)
        if((n%j)==0)
            return 0;
   return 1;
}

Huge last_prime(Huge p){
    Huge i,r;
    for (i=2;i<=p;i++){
        if(prime(i))
          r = i;    
    }
    return r;
}


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