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Day-2 / Part – 1 : Basic Input and Output in C

Posted on December 16, 2023December 16, 2023 By thecodepathshala No Comments on Day-2 / Part – 1 : Basic Input and Output in C

C programming language has standard libraries that allows us to take the input from a file or a keyboard and give the output to the screen or a file.

  • Standard input (stdin) is used for taking input.
  • Standard output (stdout) is used for giving output.
  • Standard error (stderr) is used for giving error.

The functions used for standard input and output are present in the stdio.h header file. To use those functions, we need to include the stdio.h header file in our program, as shown below.

#include <stdio.h>

Functions used for input and output

  1. printf() function – Show Output
  2. scanf() function – Take Input
  3. getchar() and putchar() function – To take and show one character
  4. gets() and puts() function – To take and show a string

Printf() function

Printf function shows the value which is passed as a parameter to standard output (console). It prints the output according to the format specifier. It returns the total number of characters written to the console.

Syntax :
printf(“%X”, variableOfXType); where %X is the format specifier like for integer type – %d, float type- %f etc.

Example :

printf("%d", intVariable)
printf("%c", charVariable)

Scanf() function

Scanf function t reads data from standard input device (keyboard) and stores it according to the parameter format into the locations pointed by the additional arguments. It reads the input according to the format specifier. It returns the number of items of the argument list successfully read.

Syntax :
scanf(“%X”, &variableOfXType);  where %X is the format specifier like for integer type – %d, float type- %f etc.

Example :

printf("%d", &intVariable)
printf("%c", &charVariable)

How to take input and output of basic types in C programming?

The basic type in C includes types like int, float, char, etc. Inorder to input or output the specific type, the X in the above syntax is changed with the specific format specifier of that type. The Syntax for input and output for these are:

  • Integer:
Input: scanf("%d", &intVariable);
Output: printf("%d", intVariable);
  • Float:
Input: scanf("%f", &floatVariable);
Output: printf("%f", floatVariable);
  • Character:
Input: scanf("%c", &charVariable);
Output: printf("%c", charVariable);

Format Specifiers in C

The format specifier in C is used to tell the compiler about the type of data to be printed or scanned in input and output operations. They always start with a % symbol and are used in the formatted string in functions like printf(), scanf, sprintf(), etc.

The below table contains the most commonly used format specifiers in C:

Format SpecifierDescription
%cFor character type.
%dFor signed integer type.
%e or %EFor scientific notation of floats.
%fFor float type.
%g or %GFor float type with the current precision.
%iUnsigned integer
%ld or %liLong
%lfDouble
%LfLong double
%luUnsigned int or unsigned long
%lli or %lldLong long
%lluUnsigned long long
%oOctal representation
%pPointer
%sString
%uUnsigned int
%x or %XHexadecimal representation
%nPrints nothing
%%Prints % character
Format specifier

Code for printf and scanf:

// C program to show input and output

#include <stdio.h>

int main()
{

	// Declare the variables
	int num;
	char ch;
	float f;

	// --- Integer ---

	// Input the integer
	printf("Enter the integer: ");
	scanf("%d", &num);

	// Output the integer
	printf("\nEntered integer is: %d", num);

	// --- Float ---

	//For input Clearing buffer
	while((getchar()) != '\n');

	// Input the float
	printf("\n\nEnter the float: ");
	scanf("%f", &f);

	// Output the float
	printf("\nEntered float is: %f", f);

	// --- Character ---

	// Input the Character
	printf("\n\nEnter the Character: ");
	scanf("%c", &ch);

	// Output the Character
	printf("\nEntered character is: %c", ch);

	return 0;
}

Output:

Enter the integer: 10
Entered integer is: 10

Enter the float: 2.5
Entered float is: 2.500000

Enter the Character: A
Entered Character is: A

Take Multiple Inputs from the User

#include <stdio.h>
int main() {
   // using scanf() for multiple inputs
   char gender;
   int age;

   printf("Enter your age and then gender(M, F or O): ");
   scanf("%d %c", &age, &gender);
   printf("You entered: %d and %c", age, gender);

   return 0;
}
Output : 

Enter your age and then gender(M, F or O): 32 M
You entered: 32 and M

Print multiple outputs

We can use a single printf() function to display values of multiple variables.

#include <stdio.h>

int main() {
   // using printf() for multiple outputs 
   int day = 20;
   int month = 11;
   int year = 2021;
   
   printf("The date is: %d-%d-%d", day, month, year);

   return 0;
}
Output : 
The date is: 20-11-2021

getchar() & putchar() functions

The getchar and putchar functions are used for taking character input from the user and printing the character as output.

getchar() function

The getchar() function reads a character from the terminal and returns it as an integer. This function reads only a single character at a time.

Syntax :

int getchar(void);

putchar() function

The putchar() function displays the character passed to it on the screen and returns the same character. This function too displays only a single character at a time.

Syntax:

int putchar(int character);

Example:

#include <stdio.h>

void main( )
{
    int c;
    printf("Enter a character");
    /*
        Take a character as input and 
        store it in variable c
    */
    c = getchar();
    /*
        display the character stored 
        in variable c 
    */
    putchar(c);
}

Output :
Enter a character: Raushan
R

gets() & puts() functions

The gets and puts functions are used for taking string input and giving string output.

gets() function

The gets() function reads a line of text from stdin(standard input) into the buffer pointed to by str pointer, until either a terminating newline or EOF (end of file) occurs.

Syntax:

char* gets(char* str);

puts() function

The puts() function writes the string str with a newline character (‘\n’) at the end to stdout. On success, a non-negative value is returned.

Syntax:

int puts(const char* str);

Example:

#include <stdio.h>

void main()
{
    /* character array of length 100 */
    char str[100];
    printf("Enter a string: ");
    gets(str);
    puts(str);
    getch();
    return 0;
}

Output :
Enter a string: Raushan
Raushan
  • When you will compile the above code, it will ask you to enter a string.
  • When you will enter the string, it will display the value you have entered.

Difference between scanf() and gets()

The main difference between these two functions is that scanf() stops reading characters when it encounters a space, but gets() reads space as a character too.

If you enter a name as Raushan Kumar using scanf() it will only read and store Raushan and will leave the part of the string after space. But gets() function will read it completely.

Here the scanf() function:

#include <stdio.h>
int main() {
   // using scanf() 
   char n1[50], n2[50];
   printf("Please enter n1: ");
   gets(n1);

   printf("You entered: %s", n1);
   return 0;
}

Output :

Please enter n1: raushan kumar
You entered: raushan

Here the gets() function:

#include <stdio.h>
int main() {
   // using scanf() 
   char n1[50], n2[50];
   printf("Please enter n1: ");
   gets(n1);

   printf("You entered: %s", n1);
   return 0;
}

Output :

Please enter n1: raushan kumar
You entered: raushan kumar

Mastering in C programming (Crash Course), Programming

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Longest valid Parentheses | GFG PTOD | 22 Feb | Leetcode | GeeksForGeeks
#gfg #ptod #geeksforgeeks 

#geeksforgeeks #gfgpotd #gfg #ptod #dsa #datastructures #algorithm #problemoftheday 

GFG Problem link : https://www.geeksforgeeks.org/problems/find-median-in-a-stream-1587115620/1

Find C++ code here  -  https://thecodepathshala.in/2025/02/20/gfg-ptod-20-feb-find-median-in-a-stream-medium-level-heap/ds-algo/

My LinkedIn -    https://www.linkedin.com/in/raushanjha146/

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Parenthesis Checker | Valid Parenthesis | GFG PTOD | 21 Feb | Leetcode | GeeksForGeeks
#gfg #ptod #geeksforgeeks 

#geeksforgeeks #gfgpotd #gfg #ptod #dsa #datastructures #algorithm #problemoftheday 

GFG Problem link : https://www.geeksforgeeks.org/problems/find-median-in-a-stream-1587115620/1

Find C++ code here  -  https://thecodepathshala.in/2025/02/20/gfg-ptod-20-feb-find-median-in-a-stream-medium-level-heap/ds-algo/

My LinkedIn -    https://www.linkedin.com/in/raushanjha146/

#google #apple  #amazon #adobe #apple #gfg #potd 

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[TSP website link] : [https://thecodepathshala.in/]

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Find median in a stream | GFG PTOD | 20 Feb | Leetcode | GeeksForGeeks
#gfg #ptod #geeksforgeeks 

#geeksforgeeks #gfgpotd #gfg #ptod #dsa #datastructures #algorithm #problemoftheday 

GFG Problem link : https://www.geeksforgeeks.org/problems/k-closest-points-to-origin--172242/1

Find C++ code here  -  

My LinkedIn -    https://www.linkedin.com/in/raushanjha146/

#google #apple  #amazon #adobe #apple #gfg #potd 

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[TSP website link] : [https://thecodepathshala.in/]

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K Closest Points to Origin | GFG PTOD | 18 Feb | Leetcode | GeeksForGeeks
#gfg #ptod #geeksforgeeks 

#geeksforgeeks #gfgpotd #gfg #ptod #dsa #datastructures #algorithm #problemoftheday 

GFG Problem link : https://www.geeksforgeeks.org/problems/maximum-path-sum-from-any-node/1

Find C++ code here  -  https://thecodepathshala.in/2025/02/05/gfg-ptod-05-feb-mirror-tree-medium-level-tree/ds-algo/

My LinkedIn -    https://www.linkedin.com/in/raushanjha146/

#google #apple  #amazon #adobe #apple #gfg #potd 

📚 Additional Resources:
[TSP website link] : [https://thecodepathshala.in/]

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►Website - [https://thecodepathshala.in/]
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K largest elements | GFG PTOD | 17 Feb | Leetcode | GeeksForGeeks
#gfg #ptod #geeksforgeeks 

#geeksforgeeks #gfgpotd #gfg #ptod #dsa #datastructures #algorithm #problemoftheday 

GFG Problem link : https://www.geeksforgeeks.org/problems/maximum-path-sum-from-any-node/1

Find C++ code here  -  https://thecodepathshala.in/2025/02/05/gfg-ptod-05-feb-mirror-tree-medium-level-tree/ds-algo/

My LinkedIn -    https://www.linkedin.com/in/raushanjha146/

#google #apple  #amazon #adobe #apple #gfg #potd 

📚 Additional Resources:
[TSP website link] : [https://thecodepathshala.in/]

🚀 Follow Me On Social Media
►Website - [https://thecodepathshala.in/]
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Serialize and deserialize a binary tree | GFG PTOD | 16 Feb | Leetcode | GeeksForGeeks
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