Swap Two Numbers in C

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  Swap Two Numbers in C In this example, you will learn to swap two numbers in C programming using two different techniques. To understand this example, you should have the knowledge of the following C programming topics: C Data Types C Programming Operators C Input Output (I/O) Swap Numbers Using Temporary Variable # include <stdio.h> int main () { double first, second, temp; printf ( "Enter first number: " ); scanf ( "%lf" , &first); printf ( "Enter second number: " ); scanf ( "%lf" , &second); // Value of first is assigned to temp temp = first; // Value of second is assigned to first first = second; // Value of temp (initial value of first) is assigned to second second = temp; printf ( "\nAfter swapping, firstNumber = %.2lf\n" , first); printf ( "After swapping, secondNumber = %.2lf" , second); return 0 ; } Output ...
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Hello World Program in C

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C "Hello, World!" Program

In this example, you will learn to print "Hello, World!" on the screen in C programming.

To understand this example, you should have the knowledge of the following C programming topics:

  • C Input Output (I/O)

Program to Display "Hello, World!"

#include<stdio.h>
int main() {
   // printf() displays the string inside quotation
   printf("Hello, World!");
   return 0;
}

Terminal Code :

Output

Hello, World!
Terminal Output :
How "Hello, World!" program works?
  • The #include is a preprocessor command that tells the compiler to include the contents of stdio.h (standard input and output) file in the program.
  • The stdio.h file contains functions such as scanf() and printf() to take input and display output respectively.
  • If you use the printf() function without writing #include <stdio.h>, the program will not compile.
  • The execution of a C program starts from the main() function.
  • printf() is a library function to send formatted output to the screen. In this program, printf() displays Hello, World! text on the screen.
  • The return 0; statement is the "Exit status" of the program. In simple terms, the program ends with this statement.

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