#include <stdio.h>
#include <stdlib.h>


int* total_number_of_books;


int** total_number_of_pages;
int main()
{
    int total_number_of_shelves;
    scanf("%d", &total_number_of_shelves);

    total_number_of_books = calloc(total_number_of_shelves, sizeof(int));

    int total_number_of_queries;
    scanf("%d", &total_number_of_queries);

    total_number_of_pages = malloc(total_number_of_shelves * sizeof(int *));
    for (int i = 0; i < total_number_of_shelves; i++) 
    {
        total_number_of_pages[i] = calloc(1100, sizeof(int));
    }

    while (total_number_of_queries--) 
    {
        int type_of_query;
        scanf("%d", &type_of_query);

        if (type_of_query == 1) 
        {
           
            int shelf, pages;
            scanf("%d %d", &shelf, &pages);
            total_number_of_books[shelf]++;
            int *book = total_number_of_pages[shelf];
            while (*book != 0)
                book++;
            *book = pages;
        } 
        else if (type_of_query == 2) 
        {
            int x, y;
            scanf("%d %d", &x, &y);
            printf("%d\n", *(*(total_number_of_pages + x) + y));
        } 
        else 
        {
            int x;
            scanf("%d", &x);
            printf("%d\n", *(total_number_of_books + x));
        }
    }

    if (total_number_of_books) 
    {
        free(total_number_of_books);
    }
    
    for (int i = 0; i < total_number_of_shelves; i++) 
    {
        if (*(total_number_of_pages + i)) 
        {
            free(*(total_number_of_pages + i));
        }
    }
    
    if (total_number_of_pages) 
    {
        free(total_number_of_pages);
    }
    
    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
}