how to write printf 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: print a string with printf in c++

//can't print with printf, since string is a C++ class obj and print %s 
//doesn't recognize
//can do
printf("%s", str.c_str()) //converts string to c str (char array)
  
  //or just use cout<<str; 
  
  //string assignment 
  str1=str2; //or
str1.assign(str2)