Single-Dimensional Array in C (Part 2)

In the previous tutorial, you learnt following things about arrays:

1. What are arrays?
2. Why do we need arrays?
3. Types of arrays?
4. Declaration and initialization of 1-D arrays

In this tutorial, you will learn entering values into already declared 1-D array and accessing elements of 1-D array.

Entering input data into an array

Once array is declared, we use for loop for entering data into array. Since array index starts with 0, for loop will start with 0;

Example:

int marks[10];

for(i=0; i<10; i++){

        printf("Enter marks of student %d\n",i+1);

        scanf("%d",&marks[i]);

    }

Reading data from an array

Since we have entered marks into marks array, we will use for loop to display the content of this array:

Example:

for(i=0;i<10;i++){

        printf("Marks of student %d are %d.\n",i+1,marks[i]);

    }

This for loop steps through the elements in the array and outputs each value. You use the loop control variable i to produce the sequence number for the value of the number of the element and to access the corresponding array element.

//Following program asks user for marks, then display them

#include<stdio.h>

int main(){

    int marks[10];

    int i;

    //Entering marks into marks array

    for(i=0; i<10; i++){

        printf("Enter marks of student %d\n",i+1);

        scanf("%d",&marks[i]);

    }

   

    //Dislaying marks from marks array

    for(i=0;i<10;i++){

        printf("Marks of student %d are %d.\n",i+1,marks[i]);

    }

    return 0;

}

Output:

Please comment if you find anything incorrect, or you want to improve the topic discussed above.