#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define bool int
 
struct sNode {
    char data;
    struct sNode* next;
};
 
void push(struct sNode** top_ref, int new_data);
void reverse(char exp[]);
int pop(struct sNode** top_ref);
 
bool isMatchingPair(char character1, char character2)
{
    if (character1 == '(' && character2 == ')')
        return 1;
    else
        return 0;
}
 
bool areBracketsBalanced(char exp[])
{
    int i = 0;
    struct sNode* parenthesis_stack = NULL;
 
    while (exp[i])
    {
        if ( exp[i] == '(')
            push(&parenthesis_stack, exp[i]);
        if ( exp[i] == ')') {
            if (parenthesis_stack == NULL)
                return 0;
            else if (!isMatchingPair(pop(&parenthesis_stack), exp[i]))
                return 0;
        }
        i++;
    }
 
    if (parenthesis_stack == NULL)
        return 1;
    else
        return 0; 
}

void reverse(char exp[])
{
    struct sNode* alpha_stack = NULL;
    int a = 0;
   
    while (exp[a])
    {
        if ( exp[a] != '(' && exp[a] !=')' && exp[a] != ' ')
           { push(&alpha_stack, exp[a]);}
           a++;
    }
    
    while(alpha_stack !=NULL)
    {
        printf("%c,",pop(&alpha_stack));
    }
}
 
int main()
{
    char exp[100];
    printf("\nInput = ");
    scanf("%s",exp);
    char e[100];
    strcpy(e,exp);
 
    if (areBracketsBalanced(exp))
        { 
            printf("Output = Balanced \n");
            reverse(e);
        }
    else { 
        printf("Output = Unbalanced \n");
    }

    return 0;
}
 
void push(struct sNode** top_ref, int new_data)
{
    struct sNode* new_node
        = (struct sNode*)malloc(sizeof(struct sNode));
 
    if (new_node == NULL) {
        printf("Stack overflow \n");
        getchar();
        exit(0);
    }
 
    new_node->data = new_data;
    new_node->next = (*top_ref);
    (*top_ref) = new_node;
}
 
int pop(struct sNode** top_ref)
{
    char res;
    struct sNode* top;
 
    if (*top_ref == NULL) {
        printf("Stack overflow \n");
        getchar();
        exit(0);
    }
    else {
        top = *top_ref;
        res = top->data;
        *top_ref = top->next;
        free(top);
        return res;
    }
}

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
}