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There surely has to be a better way to do this in C++ that this ?
if ( width_value < tipWidth )
{
if (tipWidth < threshold)
{
return threshold;
}
return tipWidth;
}
return width_value ;
return std::max(width_value, std::max(tipWidth, threshold))
Or since C++11:
return std::max({width_value, tipWidth, threshold})
That's assuming you #include <algorithm> and the type of width_value, tipWidth, threshold is the same. If not the same, you have to specify it explicitly, e.g. std::max<int>(...)
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I do not understand, how void* function can be with return value. Code below, its work.
void *TcpClient::receive(int size=512)
{
char *buffer = new char[size];
if (recv(_sockfd , buffer , sizeof(buffer) , 0) < 0)
{
std::cerr << "recv failed";
}
return buffer;
}
The function returns void*, i.e. the pointer to memory, not void.
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Can someone help me with my code ? I'm trying to use different algorithm but it returns way to big numbers, when i use algorithm between /* */ it works perfect, anyone can see whats wrong with my new code ? (same on java works)
int* czynnikiPierwsze(int n)throw (string){
if(n<0){
string wyjatek1="Nie mozna rozlozyc ujemnej liczby";
throw wyjatek1;
}
int b=0;
while(n>2){
n=n/tab[n-2];
b++;
}
dzielniki=new int[b]();
int j=0;
while(n>2){
dzielniki[j]=tab[n-2];
n=n/tab[n-2];
j++;
}
/* int a=n;
int*dzielniki=new int[30]();
for(int j=0;j<n+a;j++){
while(n>2){
dzielniki[j]=tab[n-2];
n=n/tab[n-2];
break;
}
}*/
return dzielniki;
}
There's no chance your second while(n>2) loop runs even once, since the first loop only exited when that same condition was no longer true.
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I'm trying to create 10 processes but not fanned out but rather in a chain. So process 1 is
This is untested:
for( int generation = 0 ; generation < 10 ; ++generation )
{
int pid = fork();
if( pid != 0 )
{
// Do parental things, including wait
break;
}
// Do childish things before forking.
}
Each child knows its own generation.
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void skaitoInformacija(){
ifstream duomenys("duom.txt");
int eil_nr;
duomenys >> eil_nr;
string eil[eil_nr];
string nereikalinga_eilute;
getline(duomenys, nereikalinga_eilute);
for(int i=0; i<eil_nr; i++){
getline(duomenys, eil[i]);
if(salinamTarpus(eil[i]) == "good"){ //this if statement doesn't work
}
}
}
void salinamTarpus(string eil) {
...
}
void salinamTarpus(string eil)
your function is not returning anything that you can compare with "good" string
you need to change it to return at least some result if you want to compare it...
string salinamTarpus(string eil) {
if(eil == "okString") // string eil is the right one
{
return "good";
}
return "bad";
}
also if your function salinamTarpus(string eil) returns only 2 values("good","bad") it might be better idea to return boolean,char or so. string is a little bit too much overkill
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How to Threshold image between certain range?
i have done this but it doesn't work.
for (int i=0;i<s.size().height;i++)
{
for(int j=0;j<s.size().width;j++)
{
int k=int (s.at<uchar>(j,i));
if (k>6 && k<10)
k=255;
else k=0;
s.at<uchar>(j,i)=k;
}
}
You get an uchar value, and convert it to integer. Try this :
uchar k= s.at<uchar>(j,i);
if (k>6 && k<10) {
k=255;
}else {
k=0;
}
s.at<uchar>(j,i)=k;
I think it may work.