#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
 
#define MAX_H 10
#define MAX_R 100
#define MAX_C 100
 
struct Array_3D {
    int h, r, c;
} array_3d_data;
 
int maxRows[MAX_H]; // To store the result for each 2D array
 
int*** matrix; // 3D array
 
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 
// Function to allocate memory for the 3D array
void allocate_memory(int height, int rows, int cols) {
    array_3d_data.h = height;
    array_3d_data.r = rows;
    array_3d_data.c = cols;
 
    matrix = (int***)malloc(array_3d_data.h * sizeof(int**));
    for (int i = 0; i < array_3d_data.h; i++) {
        matrix[i] = (int**)malloc(array_3d_data.r * sizeof(int*));
        for (int j = 0; j < array_3d_data.r; j++) {
            matrix[i][j] = (int*)malloc(array_3d_data.c * sizeof(int));
        }
    }
}
 
// Function to assign values to the allocated matrix
void take_input() {
    // Fill the matrix with values (for example, from user input)
    for (int i = 0; i < array_3d_data.h; i++) {
        for (int j = 0; j < array_3d_data.r; j++) {
            for (int k = 0; k < array_3d_data.c; k++) {
                // Example: Read values from the user
                scanf("%d", &matrix[i][j][k]);
            }
        }
    }
}
 
// Helper function to find the maximum number of 1's in a row
int find_max_ones(int** arr, int numRows, int numCols) {
    int maxCount = 0;
    int maxRowIndex = -1;
 
    for (int i = 0; i < numRows; i++) {
        int rowCount = 0;
        for (int j = 0; j < numCols; j++) {
            if (arr[i][j] == 1) {
                rowCount++;
            }
        }
 
        if (rowCount > maxCount || (rowCount == maxCount && i < maxRowIndex)) {
            maxCount = rowCount;
            maxRowIndex = i;
        }
    }
 
    return maxRowIndex;
}
 
// Function to find the row with the greatest number of 1's for each 2D array
void* Get_all_Rows(void* arg) {
    int idx = *((int*)arg);
 
    int maxRow = find_max_ones(matrix[idx], array_3d_data.r, array_3d_data.c);
 
    pthread_mutex_lock(&mutex);
    maxRows[idx] = maxRow;
    pthread_mutex_unlock(&mutex);
 
    return NULL;
}
 
int main() {
    int height, rows, cols;
 
    // Example: Read dimensions from the user
    scanf("%d %d %d", &height, &rows, &cols);
 
    allocate_memory(height, rows, cols);
    take_input();
 
    pthread_t threads[array_3d_data.h];
    int thread_args[array_3d_data.h];
 
    for (int i = 0; i < array_3d_data.h; i++) {
        thread_args[i] = i;
        pthread_create(&threads[i], NULL, Get_all_Rows, &thread_args[i]);
    }
 
    for (int i = 0; i < array_3d_data.h; i++)
        pthread_join(threads[i], NULL);
 
    // Display the results
    for (int i = 0; i < array_3d_data.h; i++)
        printf("%d ", maxRows[i]);
 
    // Free allocated memory
    for (int i = 0; i < array_3d_data.h; i++) {
        for (int j = 0; j < array_3d_data.r; j++)
            free(matrix[i][j]);
        free(matrix[i]);
    }
 
    free(matrix);
 
    return 0;
}

C Language online compiler

Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!

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
}