One-dimensional Array

Declaration of 1-D Array

Syntax:
datatype array_name[size]
  • Size : means how many elements you want to store in an array.
  • If number of element is more than specified size ,than interpreter will throw an error.
  • If number of element is less than specified size than interpreter will not show an error, just the value at that empty indexes there will be a garbage value.
Lets declare some Arrays

#include<stdio.h>

void main()
{
   int student[10];     // array of 10 students.
   
   
   
   int marks[10];      // marks of 10 student of  one subject.
   
   
   
   float percent[10];      //array of percentage of 10 students.
   
}

Initialization of an Array.

  • As we declare  a variable and assign a value to it ,the same thing is also done with an array.
  • We use curly bracket to initialize the array.
  • Inside, that curly bracket we write all the element in an sequence.
Syntax:
datatype array_name[size]   = {element1,element2,element3,...,..,};
Lets declare some Arrays and do their initialization.

#include<stdio.h>

void main()
{
   int student_roll[5]  = {21,32,65,78,98};     // assigning value to an array of roll no of 5 student.



   int marks[5] = {58,65,48,97,56};      // assigning value to an array of marks of 5 student of  one subject.



   float percent[10] = {56.56,65.5,59.65,94.65,63.56};      //assigning value to an array of percentage of 5  student.

}

Accessing the elements of an Array

  • Accessing elements of an array is very easy and it works very fast.
  • We access elements by its index number, as you know every element of an array has an unique index number, with that accessing of element is done.
Syntax:
array_name[index_number]
Lets Access some element of an Array


#include<stdio.h>

void main()
{  int rollno, rollno2, rollno3, mark1, mark2,mark3; //declaring variables
  float percent1, percent2,percent3;


   int student_roll[5]  = {21,32,65,78,98};     // Initializing array of roll no of 5 student.
      rollno  = student_roll[0];    // accessing the element at index 0 which is 21 and assigning to a variable
      rollno2 =  student_roll[1];  // accessing the element at index 1 which is 32 and assigning to a variable
      rollno3 = student_roll[2];   // accessing the element at index 2 which is 65 and assigning to a variable






   int english_marks[5] = {58,65,48,97,56};      // Initializing array of marks of 5 student of  one subject.
     mark1 = english_marks[0];  // accessing the element at index 0 which is 58 and assigning to a variable
     mark2 = english_marks[1];  // accessing the element at index 1 which is 65 and assigning to a variable
     mark3 = english_marks[2];  // accessing the element at index 2 which is 48 and assigning to a variable


















   float percent[10] = {56.56,65.5,59.65,94.65,63.56};      //Initializing  an array of percentage of 5  student.
   
   
   percent1 = percent[0];   // accessing the element at index 0 which is 56.56 and assigning to a variable
    percent2 = percent[1];  // accessing the element at index 1 which is 365.5 and assigning to a variable
    percent3 = percent[2]; // accessing the element at index 2 which is 59.65 and assigning to a variable












           // printing the marks ,roll no, percentage  of accessed data from the arrays. 
   printf("\nStudent whose roll no is %d has %d marks in English and achieved %f percentage",rollno,mark1,percent1);
    printf("\nStudent whose roll no is %d has %d marks in English and achieved %f percentage",rollno2,mark2,percent2);
     printf("\nStudent whose roll no is %d has %d marks in English and achieved %f percentage",rollno3,mark3,percent3);

}

 








Output:



Student whose roll no is 21 has 58 marks in English and achieved 56.56 percentage

Student whose roll no is 32 has 65 marks in English and achieved 65.5 percentage

Student whose roll no is 65 has 48 marks in English and achieved 59.65 percentage











 Further Concepts:






Practice Programs


    

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