Swap 2 Numbers in C

1. Swap 2 Numbers in C without using extra space or variable 

#include<stdio.h>


int main()
{
 int a, b;
 printf("Enter value of a and b");
 scanf("%d %d", &a, &b);


printf("a and b before swap is = %d and %d\n", a , b);
a = a+b;
b = a-b;
a = a-b;
printf("a and b after swap is = %d and %d\n", a , b);



return 0;

}

2. Swap 2 Numbers in C using extra variable

#include<stdio.h>

int main()
{

int a, b;
printf("Enter value of a and b");

scanf("%d %d", &a, &b);

printf("a and b before swap is = %d and %d\n", a , b);
int c; // temporary variable
c = a;
a = b;
b = c;
printf("a and b after swap is = %d and %d\n", a , b);

return 0;

}




Comments

Post a Comment

Popular posts from this blog

Setting up a USB thermal printer with a Raspberry Pi 3B+

It involves a few key steps. Here’s a complete guide to get it working: 1. Gather Required Materials Raspberry Pi 3B+ (with Raspbian OS installed) USB thermal printer USB cable to connect the printer Printer paper Power supply for the Raspberry Pi and printer 2. Connect the Printer Connect the thermal printer to the Raspberry Pi via the USB port. Ensure the printer is powered on and loaded with paper. 3. Install Required Packages Open the terminal on your Raspberry Pi and install the necessary software: Download the driver software for the printer.  Use install.sh file to install it. $ chmod +x install.sh       // make the install.sh file executable $ sudo ./install.sh        // run the install.sh  $ sudo apt install cups libcups2-dev printer-driver-escpr CUPS (Common Unix Printing System) is a printing system that allows the Raspberry Pi to communicate with printers. printer-driver-escpr includes drivers for many thermal printers. 4. Add U...
Read more

Autostart an app on reboot - Raspberry Pi

Option 1: pi@raspberrypi:~ $ sudo nano /etc/rc.local #add path before exit 0 line: su - pi -c "sleep 10 && export DISPLAY=:0 && cd "folderPath" && /usr/bin/python3 fileName.py" & CTRL+O  // to save the changes Enter CTRL+X  // to close the file editor pi@raspberrypi:~ $ sudo reboot (To check the autostart of the software app.) Option 2: go to /home/pi/.config create an autostart folder create a .desktop file into this. add path of an autoreboot.sh file to it with delay : app.Desktop file [Desktop Entry] Exec=sh -c "sleep 15; /home/pi/on_reboot.sh" Create a virtual environment myenv add app folder to myenv create a on_reboot.sh file in /home/pi/ folder.  Add following paths into this file: #!/bin/bash source /home/pi/Documents/myenv/bin/activate cd /home/pi/Documents /myenv/MyApp python3 app.py sudo reboot to check the autostart of the software app.
Read more

Basic Input/Output C Program

Basic Input/Output C Program Example 1. #include < stdio.h > // header file for standard input & output functions // main function of the program which execute first in every program - starting point int main () { printf ( " Hello World \n " ); // an integer variable declaration int x ;           // Read a value from standard input scanf ( " %d " , & x ); // Write value to the standard output printf ( " %d \n " , x ); // return 0 tells that program executed successfully return 0 ; } Example 2.   #include < stdio.h > int main () { int x = 5 ; printf ( " X data is= %d \n " , x ); int y = 7 ; printf ( " Y data is= %d \n " , y ); y = 50 ; printf ( " Y data is= %d \n " , y ); printf ( " Address of X is= %u \n " , & x ); return 0 ; } Note :- A variable with '&' in prefix represents the address of that variable. e...
Read more