printf c++ code example

Example 1: how to print in c++

#include <iostream>

int main() {
  std::cout << "Hello, World!"; // prints 'Hello, World!' to the output.
  return 0;
}

Example 2: 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 3: 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)

Example 4: c printf

/* printf example */
#include <stdio.h>

int main()
{
   printf ("Characters: %c %c \n", 'a', 65);
   printf ("Decimals: %d %ld\n", 1977, 650000L);
   printf ("Preceding with blanks: %10d \n", 1977);
   printf ("Preceding with zeros: %010d \n", 1977);
   printf ("Some different radices: %d %x %o %#x %#o \n", 100, 100, 100, 100, 100);
   printf ("floats: %4.2f %+.0e %E \n", 3.1416, 3.1416, 3.1416);
   printf ("Width trick: %*d \n", 5, 10);
   printf ("%s \n", "A string");
   return 0;
}

Example 5: printf() in cpp

#include <cstdio>
int printf( const char *format, ... );
cout<<printf;