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Category: C

atof stof stod problems with local floating point separator in C/C++

Posted on May 7, 2021 by Yılmaz Cemalettin

Today I encounter a problem with my C++ code. I try to convert string to double. Then I realize in my computer std::atof doesn’t work properly. Also others(stof stod) doesn’t not work correctly. Then I decide to find the issue. I write to simple script to print all output of those functions.

C++
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//
#include <iostream>
#include <stdlib.h>
int main(int argc, char *argv[])
{
    std::string num = "3.5";
    std::cout<<num<<std::endl;
 
    double ret = std::atof(num.c_str());
    std::cout<<ret<<std::endl;
    std::cout<<ret+0.1<<std::endl;
 
    ret = std::stof(num);
    std::cout<<ret<<std::endl;
    std::cout<<ret+0.1<<std::endl;
 
    ret = std::stod(num);
    std::cout<<ret<<std::endl;
    std::cout<<ret+0.1<<std::endl;
    
    return 0;
 
}

Outputs:

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//
3.5
3
3.1
3
3.1
3
3.1

…

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Thread Cooperation | Learn CUDA

Posted on June 9, 2019June 9, 2019 by Yılmaz Cemalettin

Thread Cooperation Nowadays, I try to learn CUDA. I follow some books for that. In this post, I use CUDA BY EXAMPLE An introduction to General-Purpose GPU Programming book which is written by Jason Sanders and Edward Kandrot. In this section, I try to learn Thread cooperation topic. First I will try to recode big…

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Parallel Programming in CUDA C | Learn CUDA

Posted on June 8, 2019June 8, 2019 by Yılmaz Cemalettin

Parallel Programming in CUDA C Nowadays, I try to learn CUDA. I follow some books for that. In this post, I use CUDA BY EXAMPLE An introduction to General-Purpose GPU Programming book which is written by Jason Sanders and Edward Kandrot. In this section, I try to learn parallel programming in CUDA C. First I…

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Device Info Query with CUDA | Xavier

Posted on June 5, 2019June 5, 2019 by Yılmaz Cemalettin

Device Info Query In this post, I show how can query to device information with Cuda. In this post, I will use the NVDIA Jetson Xavier Device. However, the below code can run any compatible device with CUDA. Xavier Specification is:

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PinBall Game (Atmega 32)

Posted on April 21, 2018 by Yılmaz Cemalettin

Pinball Game Introduction: Our aim in this project is designing a pinball machine that can be played in automatic mode and manual mode. In manual mode player can control the flippers with buttons, in automatic mode game play itself automatically. Setup has consist of ldr, laser, ultrasonic sensor, solenoid motors, 7-segment display, buzzer and led…

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Reads given file character by character and count them and lines in C

Posted on January 25, 2018March 24, 2018 by Yılmaz Cemalettin

Writing a program that reads a given file character by character, and prints them on the screen, followed by the number of lines and characters. The name of the file will be read from the command line, as follows: ProgramName filename You are supposed to use the skeleton file ReadFile.c After adding the missing codes,…

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File Operations in C

Posted on January 24, 2018March 24, 2018 by Yılmaz Cemalettin

Task1 Write a program that joins the two sorted files to an output file such that the resulting file is also sorted. Your program should read the names of the files to be joined from the command line, as well as the name of the file which will store the joined content, as shown below:…

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Using fprintf() with different format (%*s.*lf)

Posted on January 24, 2018March 24, 2018 by Yılmaz Cemalettin

Writing a program that outputs PI in different formats, as given below (and also in PIs.txt). You can use M_PI from math.h. Codes with fewer lines than 30 will get extra marks (my code is 21 lines excluding comments). Like Bellow Figure. I use the %*s and %*lf format for this printing

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