Cpp11 Programming Examples

breath

cpp11

#include <stdio.h>
#include <math.h>

// #define precision double
typedef double precision;

// #define TOP 20000    // KEAZ128
// #define TOP 8000     // KL25
#define TOP (38400 * 0.8)      // EFR32P12
#define STEP 50
const precision Pi2 = (2 * M_PI);
const precision NE = (1 / M_E);
const precision amplitude = (TOP / (M_E - (1 / M_E)));

int main(void) {

    precision out;
    precision i;
    printf("\nNE = %f, amplitude = %f\n", NE, amplitude);
    printf("sin(π/2) = %f\n", sin(M_PI / 2));
    int j;

    for(j = 0, i = 0; i < Pi2; i += 0.1, j++) {
        if( (j & 0x07) == 0 )
            printf("\n");

        out = (exp(sin(i)) - NE) * amplitude;
        printf("%d,\t", (int)out);
    }
    printf("\n");
}

https://pt.stackoverflow.com/q/45723/101

cpp11

#include <iostream>
using namespace std;
int getNumber(bool &check) {
    check = !check;
    return check ? 10 : 20;
}

int main() {
    bool numero = false;
    cout << getNumber(numero) << endl;
    cout << getNumber(numero) << endl;
    cout << getNumber(numero) << endl;
}

//https://pt.stackoverflow.com/q/45723/101

Compile and Execute C++11 Online

cpp11

#include <iostream>

using namespace std;

int main()
{
   cout << "Hello World" << endl; 
   
   return 0;
}

3d pointer

cpp11

#include <iostream>
using namespace std;
 
int  main()
{
    int ***ptr;
    ptr = (int ***)malloc(5*sizeof(int**));
    for(int i=0;i<5;i++){
        *(ptr+i) = (int**)malloc(5*sizeof(int*));
        for(int j=0;j<5;j++){
            *(*(ptr+i)+j) = (int*)malloc(5*sizeof(int));
        }
    }
    int n=0;
    for(int i =0;i<5;i++){
        for(int j=0;j<5;j++){
            for(int k=0;k<5;k++){
                *(*(*(ptr+i)+j)+k) = ++n;
            }
        }
    }
    printf("%d\n",*(*(*(ptr+1)+2)+4));
    printf("%d\n",ptr[1][2][4]);
    return 0;
}

std::map upper_bound lower_bound

cpp11

#include <iostream>
#include <map>

int main()
{
  std::map<int, std::string> m{ {10, "10"}, {20, "20"}, {30, "30"}, {40, "40"}, {50, "50"} };

  std::cout << "lower bound 25: " << m.lower_bound(25)->second << std::endl;
  std::cout << "upper bound 25: " << m.upper_bound(25)->second << std::endl;
  std::cout << "lower bound 30: " << m.lower_bound(30)->second << std::endl;
  std::cout << "upper bound 30: " << m.upper_bound(30)->second << std::endl;
      
  return 0;
}

Hello World

cpp11

Unable to open file!