what does printf mean in c++ code example

Example 1: printf in c++

#include <cstdio>

int main()
{
    char ch = 'a';
    float a = 5.0, b = 3.0;
    int x = 10;

    printf("%.3f / %.3f = %.3f \n", a,b,a/b);
    printf("Setting width %*c \n",5,ch);
    printf("Octal equivalent of %d is %o \n",x,x);

    return 0;
}

Example 2: what does tilde mean in c++

// ~ AKA a tilde is used to create destructors in classes. 

class Entity{
  public: 
  	~Destructor();
  	//This is a destructor, which destroys instances and can free up memory.
};

//Source for answer:
// https://stackoverflow.com/questions/1395506/in-c-what-does-a-tilde-before-a-function-name-signify

//Other Sources:
// https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_74/rzarg/cplr380.htm