 #include <stdio.h>
int main ()
{
  int rows, columns;
  /*The variables Rows and Columns are used 
     only for user to Create The 2D Array-Matrix size of his choice */
  printf ("𝙀𝙣𝙩𝙚𝙧 𝙩𝙝𝙚 𝙣𝙪𝙢𝙗𝙚𝙧 𝙤𝙛 𝙧𝙤𝙬𝙨 𝙖𝙣𝙙 𝙘𝙤𝙡𝙪𝙢𝙣𝙨 :\n\n");
  scanf ("%d %d", &rows, &columns);
  printf ("%d %d\n", rows, columns);

  int matrix[rows][columns];
  printf ("\n𝙀𝙣𝙩𝙚𝙧 𝙏𝙝𝙚 𝙀𝙡𝙚𝙢𝙚𝙣𝙩𝙨:\n\n");

  for (int i = 0; i < rows; i++)
    for (int j = 0; j < columns; j++)
      scanf ("%d", &matrix[i][j]);
  //Taking input from user

  for (int i = 0; i < rows; i++)
    {
      for (int j = 0; j < columns; j++)
	{
	  if ((matrix[i][j] >= 0) && (matrix[i][j] <= 9))
	    printf ("  %d", matrix[i][j]);
	  else
	    printf (" %d", matrix[i][j]);
	}
      printf ("\n");
    }
  // Displaying the 2D Array-Matrix

  int r = rows - 1;
  int c = columns - 1;
  /*R & C variables are I and J in the recursive Function Sum(),
     They ll be used as looping variables for traversing through The 2d Array */
  int x = rows - 1;
  int y = columns - 1;
  /* X & Y are constant variables which will never change 
     They contain the number of rows and columns the 2d array is made up of */



  int s = Sum (r, c, rows, columns, matrix, x, y);
  printf (" \n𝙏𝙝𝙚 𝙎𝙪𝙢 𝙊𝙛 𝙀𝙡𝙚𝙢𝙚𝙣𝙩𝙨 𝙞𝙣 𝙩𝙝𝙚 𝘼𝙧𝙧𝙖𝙮 𝙞𝙨 : %d", s);

}

int Sum (int i, int j, int rows, int columns, int matrix[rows][columns], int x,int y)
{


  if ((i == 0) && (j == 0))
    return matrix[i][j];	// condition 3

  if (j == 0)
    return matrix[i][j] + Sum (i - 1, y, rows, columns, matrix, x, y);	// condition 2

  else
    return matrix[i][j] + Sum (i, j - 1, rows, columns, matrix, x, y);	// condition 1

}

created 3 years ago

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Read inputs from stdin

OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

Structured Programming
Popular system programming language
UNIX, MySQL and Oracle are completely written in C.
Supports variety of platforms
Efficient and also handle low-level activities.
As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}