#include <stdio.h>

#define CC_SHORT_NAMES
#include "cc.h"

// With inbuilt key type

void test_map_with_builtin_key_type( void )
{
  map( int, long ) our_map;
  init( &our_map );
  
  for( int i = 0; i < 100; ++i )
    if( !insert( &our_map, i, i * 10 ) )
      exit( 1 ); // Out of memory
  
  for( int i = 0; i < 100; ++i )
    printf( "%d: %ld\n", i, *get( &our_map, i ) );
    
  for( int i = 0; i < 100; i += 2 )
    erase( &our_map, i );
  
  for_each( &our_map, key, val )
    printf( "%d: %ld\n", *key, *val );
  
  for( long *i = first( &our_map ); i != end( &our_map ); i = next( &our_map, i ) )
    printf( "%d: %ld\n", *key_for( &our_map, i ), *i );
  
  cleanup( &our_map );  
}

// With custom key type

typedef struct
{
  int key;
} our_key_ty;

#define CC_CMPR our_key_ty, { return ( val_1.key > val_2.key ) - ( val_1.key < val_2.key ); }
#define CC_HASH our_key_ty, { return val.key * 2654435761ull; }
#include "cc.h"

void test_map_with_custom_key_type( void )
{
  map( our_key_ty, long ) our_map;
  init( &our_map );
  
  for( int i = 0; i < 100; ++i )
    if( !insert( &our_map, (our_key_ty){ i }, i * 10 ) )
      exit( 1 ); // Out of memory
  
  for( int i = 0; i < 100; ++i )
    printf( "%d: %ld\n", i, *get( &our_map, (our_key_ty){ i } ) );
    
  for( int i = 0; i < 100; i += 2 )
    erase( &our_map, (our_key_ty){ i } );
  
  for_each( &our_map, key, val )
    printf( "%d: %ld\n", ( *key ).key, *val );

  for( long *i = first( &our_map ); i != end( &our_map ); i = next( &our_map, i ) )
    printf( "%d: %ld\n", key_for( &our_map, i )->key, *i );
  
  cleanup( &our_map );
}

int main()
{
  test_map_with_builtin_key_type();
  printf( "---------------------\n" );
  test_map_with_custom_key_type();
  
  return 0;
}

C Language online compiler

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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

  1. Library Functions:

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

  1. 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
}