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How do I properly use the printf function?

+8 votes
asked Jan 4, 2021 by Kyden Busy (200 points) 1 flag
I've only used the cout and cin functions when I found out that calling functions using <iostream> doesn't really work, I started using printf. But I have no idea how to actually use it.

Please help, Kyden.

2 Answers

0 votes
answered Jan 7, 2021 by Peter Minarik (84,720 points)

iostream is C++ library. Maybe you compiled the code for C only (top right corner)?

The following code works fine in C++ (but obviously does not compile in C), check it:

#include <iostream>

int main()
{
    std::cout << "Hello World" << std::endl;
    return 0;
}
0 votes
answered Jan 7, 2021 by Pallabesh Maharana (460 points)

printf() function is a function of 'C' language. It is used to print something in output screen (Same as cout function in 'C++' language). This requires stdio.h header file to be executed (Some times it also runs without any header file, depending upon the compiler you use!).

 Syntax for displaying hello world :-

#include<stdio.h>

void main()

{

printf("hello world");

}

Note:- Make sure you give a semicolon(;) after printf statement.

And if you want to display value of a variable. 

Syntax to print value of a :-

#include<stdio.h>

void main()

{

int a=69;

printf("%d",a);

}

Note:- Here %d is a format specifier. If you don't know, search for it...

commented Jan 7, 2021 by Pallabesh Maharana (460 points)
Hope you got it.
If not  then click here for more examples....
https://www.w3schools.in/c-program/print-string/
And if you don't know what is format specifier click here...
https://www.tutorialspoint.com/format-specifiers-in-c
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