#include <stdio.h>

int main()
{
    //Array 1 getting process
    int n;
    printf("Enter array 1 size:\n");
    scanf("%d",&n);
    int a[n];
    printf("Enter %d elements:\n",n);
    for(int i=0;i<n;i++){
      scanf("%d",&a[i]);//getting array 1 values
    }
    
    //Array 2 getting process
    int m;
    printf("Enter array 2 size:\n");
    scanf("%d",&m);
    int s=n+m;//adding size for merging array
    int b[s];
    printf("Enter %d elements:\n",m);
    for(int i=0;i<m;i++){
      scanf("%d",&b[i]);//getting array 2 values
    }
    
    //printing non unique elements
    printf("\nNon Unique Elements\n");
    for(int i=0;i<n;i++){
      for(int j=0;j<m;j++){
        if(a[i]==b[j]){//check for common elements present in merged array
          printf("%d ",a[i]);
          break;
        }
      }
    }
    
    //merging arrays to find unique elements
    //array 'a' elements merged with array 'b'
    for(int i=0;i<n;i++){
        b[m++]=a[i];
    }
    
    //if you need to check the Merged array, just run this without commenting
    // printf("\nMerged Array\n");
    // for(int i=0;i<s;i++){
    //     printf("%d ",b[i]);
    // }
    
    //printing unique elements
    printf("\nUnique Elements\n");
    int count;//to count the numbers
     for(int i=0;i<s;i++){
        count=0;//make count every time 0 to reuse for another number
        for(int j=i+1;j<s;j++){
          if(b[i]==b[j]){
            count++;//get count of each number
            for(int k=j;k<s-1;k++)
              b[k]=b[k+1];//need to remove the duplicate numbers
            s--;
            j--;
          }
        }
        
        if(count==0)//if unique element is present count will be remain as 0
          printf("%d ",b[i]);
          
    }
    
}
//end of program
by

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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
}