5-Comment.md

Take Input in C

Video Link: https://youtu.be/L2H2rtCLB-0 Tutorial Link: https://www.programiz.com/c-programming

Comments in C

#include <stdio.h>

int main() {

  // create a variable
  int data = 34;

  // print the value of data variable
  printf("Data = %d", data);

  return 0;
}

Output

Data = 34

Comment and code can be on the same line like this

#include <stdio.h>

int main() {

  int data = 34;    // create a variable

  printf("Data = %d", data);   // print the variable

  return 0;
}

Output

Data = 34

---

Prevent Executing Code Using Comments

#include <stdio.h>

int main() {
    
  int age;
  double height;
  
  printf("Enter the age: ");
  scanf("%d", &age);
  
  printf("Enter the height: ");
  scanf("%lf", &height);
  
  printf("Age = %d", age);
  printf("\nHeight = %.1lf", height);

  return 0;
}

Suppose, height input is not required so we will comment it out

#include <stdio.h>

int main() {
    
  int age;
  // double height;
  
  printf("Enter the age: ");
  scanf("%d", &age);
  
  // printf("Enter the height: ");
  // scanf("%lf", &height);
  
  printf("Age = %d", age);
  // printf("\nHeight = %.1lf", height);

  return 0;
}

Output

Enter the age: 29
Age = 29

---

Multiline Comments in C Programming

This program takes age input from the user
It stores it in the age variable
And, print the value using printf()

#include <stdio.h>

int main() {
    
  int age;
  
  printf("Enter the age: ");
  scanf("%d", &age);
 
  printf("Age = %d", age);

  return 0;
}

Multiline commenting above program

/* This program takes age input from the user
It stores it in the age variable
And, print the value using printf() */

#include <stdio.h>

int main() {
    
  int age;
  
  printf("Enter the age: ");
  scanf("%d", &age);
 
  printf("Age = %d", age);

  return 0;
}

Output

Enter the age: 29
Age = 29

Keyboard Shortcut

Cmd + shift + / for multiline comments

/* This program takes age input from the user
It stores it in the age variable
And, print the value using printf() */

#include <stdio.h>

int main() {
    
  int age;
  
  printf("Enter the age: ");
  scanf("%d", &age);
 
  printf("Age = %d", age);

  return 0;
}

Cmd + / for singleline comment

// This program takes age input from the user
// It stores it in the age variable
// And, print the value using printf()

#include <stdio.h>

int main() {
    
  int age;
  
  printf("Enter the age: ");
  scanf("%d", &age);
 
  printf("Age = %d", age);

  return 0;
}

---

Programiz Quiz

Q. What is the correct way to comment in C programming?

Options

1. //
2. #
3. <!--->
4. All of the above

Answer: 1