int main() { constexpr double cm_per_inch = 2.54; // number of centimeters in // an inch double length = 1; // length in inches or // centimeters char unit = 0; cout<< "Please enter a length followed by a unit (c or i):\n"; cin >> length >> unit; if (unit == 'i') cout << length << "in == " << cm_per_inch*length << "cm\n"; else cout << length << "cm == " << length/cm_per_inch << "in\n"; }

int main() { constexpr double cm_per_inch = 2.54; // number of centimeters in // an inch double length = 1; // length in inches or // centimeters char unit = 0; cout<< "Please enter a length followed by a unit (c or i):\n"; cin >> length >> unit; if (unit == 'i') cout << length << "in == " << cm_per_inch*length << "cm\n"; else cout << length << "cm == " << length/cm_per_inch << "in\n"; }

test.cpp:13:17: warning: multi-character character constant [-Wmultichar] 13 | if (unit == 'inch') | ^~~~~~

int main() { constexpr double cm_per_inch = 2.54; // number of centimeters in // an inch double length = 1; // length in inches or // centimeters char unit = 0; cout<< "Please enter a length followed by a unit (c or i):\n"; cin >> length >> unit; if (unit == 'i') cout << length << "in == " << cm_per_inch*length << "cm\n"; else cout << length << "cm == " << length/cm_per_inch << "in\n"; }

Why I'm not getting any error??...program is running fine as expected!

Why I'm not getting any error??...program is running fine as expected!

u try to change in line 13?

You put char in ' (single quote) and " for a string... (Double quote).

and now got this test.cpp: In function ‘int main()’: test.cpp:13:14: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] 13 | if (unit == "inch")

and now got this test.cpp: In function ‘int main()’: test.cpp:13:14: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] 13 | if (unit == "inch")

int main() { constexpr double cm_per_inch = 2.54; // number of centimeters in // an inch double length = 1; // length in inches or // centimeters char unit = 0; cout<< "Please enter a length followed by a unit (c or i):\n"; cin >> length >> unit; if (unit == 'i') cout << length << "in == " << cm_per_inch*length << "cm\n"; else cout << length << "cm == " << length/cm_per_inch << "in\n"; }

What have you declared unit as?

I changed constexpr to const and it worked

char

char is a single byte you can't compare it with string...

declare it as string.

how about array?

You can use array of char and use strcmp to compare the string.

You can use array of char and use strcmp to compare the string.

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Anyone to guide me!

Can't you try it out on your compiler? You must read about operator precedence and associativity to understand how these expressions are evaluated.

Is there a standard way of combining multiple hashes (not necessarily STL standard, but rather industry standard)? For example for hashing a struct or array. I see in the answers on the internet people suggest different custom functions without providing any background why exactly these ways with these magical constants. Also most of them based on bitshifts, but we have std::rotl and std::rotr now that feel as a better way to rotate bits without loosing data.

Rehashing the list of hashes with fnv or another hashing function (Murmur would be very suited as it would be cheap to combine murmur hashes together because of the unit size of murmur hashes)

What is recursition

Im just a begginer and i need someone to help me

Hello everyone. Anyone knows if is there a way to create a scrollview with OpenGL and C++?

What is recursition

I'm stuck here!! I found this question on hackerrank. I'm trying to solve since two days but every time I try its not working . Q : Parallel processing A computer has certain number of cores and list of files need to be executed. If a file is executed by a single core, the execution time equals to the number of lines of code in the file. If the lines of code can be divided by the number of cores, another option is to execute the file in parallel using all the cores, in which case execution time is divided by the number of cores. However, there is a limit has to how many files can be executed in parallel. Given the lengths of code files, the number of cores, and the limit, what is the minimum amout of time needed to execute all the files ? For example let's say there are n = 5 files, where files = [4, 1, 3, 2, 8](indicating number of lines of code in each file) , numOfCores = 4, limit = 1. Even though both the first and fifth file can be executed parallel, you must choose only of them because the limit is 1. The optimal way is to parallelize the last file, so the minimum execution time required is 4 + 1 + 3 + 2 + (8/4) = 12. Therefore, the answer is 12. ======================== Function parameters : long minTime (int files_count, int* files, int numCores, int limit); int main() { // call minTime(); } languages : C / C++ / java ================ My code: long minTime(int files_count, int* files, int limit) { long min_time; for (int i = 0; i < fikes_count; i++) { if (files[i] % numCores == 0) { files[i] 6 files[i] / numCores; } min_time += files[i]; return min_time; } } Please slove this and explain for me . Thanks

What have you done so far? Where is your code? If you're stuck since two days, what were your attempts?

hooray censorship in the chat

My code: long minTime(int files_count, int* files, int limit) { long min_time; for (int i = 0; i < fikes_count; i++) { if (files[i] % numCores == 0) { files[i] 6 files[i] / numCores; } min_time += files[i]; return min_time; } }

Hello guys, how to fix this problem: aes.h [Error] openssl/opensslconf.h: No such file or directory

which execution will be fast for array printing ?? https://pastebin.com/TR1XcYPz array<double,4>

which execution will be fast for array printing ?? https://pastebin.com/TR1XcYPz array<double,4>

For scroll view you need to implement two things: - positioning of elements - clipping Positioning is easy, you need to calculate the total height of the content inside the scroll. You have position and the size of the scrollbar, and you have the scroll offset (which is some value from zero to content height minus scrollbar height). You can calculate position of each element from that data knowing it position in the content: scrollbar position + offset + position of the element. E.g. you have content with 1500px size, you have a button that is in coordinates 10px, 1300px in this content, you have the scrollbar position as 20px 30px in the window and with height of 300px. And it's scrolled down (offset) by 40 px. So your button will be in coordinates 20+10=30 by x and 30+40+1300=1370 by y in window coordinates. I used pixel coordinates for simplicity, you probably will have floating point coordinates of your choice, it should work for any. The clipping part is more complex, idea of clipping is to hide parts of the content that should not be visible. You can use masks or render to texture for that. You can Google more info about both.

if you want to have fun iterating an array you can try this method haha, but in terms of safety use standard ways or range based for loop int main() { int const size = 5; std::array<int, size> v = { 1, 2, 3, 4, 5 }; int* begin = &v[0]; int* end = &v[size - 1]; do { std::cout << *begin << ' '; ++begin; } while ( begin <= end ); }

is it always better to use pointers ?

Hello guys, how to fix this problem: aes.h [Error] openssl/opensslconf.h: No such file or directory

Hello guys, how to fix this problem: aes.h [Error] openssl/opensslconf.h: No such file or director

My code: long minTime(int files_count, int* files, int limit) { long min_time; for (int i = 0; i < fikes_count; i++) { if (files[i] % numCores == 0) { files[i] 6 files[i] / numCores; } min_time += files[i]; return min_time; } }

It seems like you're not using the limit at all? You probably only want to divide the biggest files, as processing these in parallel yield the highest time savings. E.g. Files : [16, 24, 32, 8, 4], limit: 2, numCores: 4 In this case you could choose any two files to process in parallel but choosing the biggest two (32, 24) gives the best result Also your return statement should be outside the for loop

Can you suggest code implimentation for me?

#include <iostream> using namespace std; string CustomerDetails(string name){ cout<<"\n***** Welcome "<<name<<" *****"<<endl; cout<<"\n"; return name; } int unitConsumed(double previous,double current){ double unit; unit = current - previous; return unit; } string customerType(){ string domestic = "Domestic", industrial = "Industrial", commercial = "Commercial"; double p,c; if (unitConsumed(p,c) < 100){ return domestic; } else if (unitConsumed(p,c) > 100 && unitConsumed(p,c) <= 200){ return industrial; } else if (unitConsumed(p,c) > 200) return commercial; } } int main() { string name; cout <<"Please Enter Your Name: "; getline(cin,name); // CustomerDetails(name); double currentMeter, PreviousMeter; cout <<"\n\nEnter Previous Meter Reading (kwh): "; cin>>PreviousMeter; cout<<"\nEnter Current Meter (kwh): "; cin>>currentMeter; unitConsumed(PreviousMeter, currentMeter); cout<<"\n"; cout<<unitConsumed(PreviousMeter, currentMeter); cout<<"\n"; cout <<customerType(); return 0; }

#include <iostream> using namespace std; string CustomerDetails(string name){ cout<<"\n***** Welcome "<<name<<" *****"<<endl; cout<<"\n"; return name; } int unitConsumed(double previous,double current){ double unit; unit = current - previous; return unit; } string customerType(){ string domestic = "Domestic", industrial = "Industrial", commercial = "Commercial"; double p,c; if (unitConsumed(p,c) < 100){ return domestic; } else if (unitConsumed(p,c) > 100 && unitConsumed(p,c) <= 200){ return industrial; } else if (unitConsumed(p,c) > 200) return commercial; } } int main() { string name; cout <<"Please Enter Your Name: "; getline(cin,name); // CustomerDetails(name); double currentMeter, PreviousMeter; cout <<"\n\nEnter Previous Meter Reading (kwh): "; cin>>PreviousMeter; cout<<"\nEnter Current Meter (kwh): "; cin>>currentMeter; unitConsumed(PreviousMeter, currentMeter); cout<<"\n"; cout<<unitConsumed(PreviousMeter, currentMeter); cout<<"\n"; cout <<customerType(); return 0; }