Question

Lab # 7
Objectives
1. Ability to use 2-dimensional arrays.
2. Ability to use 1-dimensional Variable Length / dynamic arrays.

Part 1: 2-Dimensional int array

Write and execute the following code to create a 1-dimensional int array.

#include<stdio.h>
int main(){
/* 2D array declaration*/
int disp[2][3];
/Counter variables for the loop/
int i, j;
for(i=0; i<2; i++) {
for(j=0;j<3;j++) {
printf("Enter value for disp[%d][%d]:", i, j);
scanf("%d", &disp[i][j]);
}
}
//Displaying array elements
printf("Two Dimensional array elements:\n");
for(i=0; i<2; i++) {
for(j=0;j<3;j++) {
printf("%d ", disp[i][j]);
if(j==2){
printf("\n");
}
}
}
return 0;
}

Part 2: Array initialization
In the example above you required the user to input the values for the array.
Modify the program in Part 1 so that instead of asking the user for the values of array elements, they are all initialized using a single statement.

Part 3: Dynamic/Variable Length 1-dimensional array
Write a program that does the following:
1. Asks user for a positive integer, N.
2. Creates a 1-dimensional integer array of length N.
3. Stores the squares of all integers from 1 to N in the array.
4. Prints out all N values of the array.

Answer 1

In these C programs:

- For part 1, we have created a 1D int array accepting input from the user to store the values in the array and then printing it.

- For part 2, we have created 2D int array and printing it

- For part 3, we have created Dynamic/Variable-Length 1D array and printing it.

Part 1: Creating a 1-Dimensional int array:

#include<stdio.h>
int main()
{
/* 1D array declaration*/
int disp[2];
  
//Counter variable for the loop
int i;
  
//Accepting the input values for the 1D array
for(i=0; i<2; i++)
{
printf("Enter value for disp[%d]:", i);
scanf("%d", &disp[i]);
}
  
//Displaying array elements
printf("One Dimensional array elements:\n");
for(i=0; i<2; i++)
{
printf("%d ", disp[i]);
  
}
return 0;
}

Output:

Part 2: 2D Array initialization:

#include<stdio.h>
int main()
{
/* 2D array declaration*/
int disp[2][3]={1,2,3,4,5,6};
  
//Counter variables for the loop
int i, j;

//Displaying array elements
printf("Two Dimensional array elements:\n");
for(i=0; i<2; i++)
{
for(j=0;j<3;j++)
{
printf("%d ", disp[i][j]);
if(j==2)
{
printf("\n");
}
}
}
return 0;
}

Output:

Part 3: Dynamic/Variable-Length 1-dimensional array

#include<stdio.h>
int main()
{
//declaring a positive integer N and reading value
int N;
printf("Please enter a Positive integer: ");
scanf("%d",&N);
  
//1D array declaration of length N
int disp[N];
  
//Counter variable for the loop
int i;
  
for(i=1;i<=N;i++)
{
disp[i-1]=i*i;   
}

//Displaying array elements
printf("Two Dimensional array elements:\n");
for(i=0; i<N; i++)
{
printf("%d ", disp[i]);
}
return 0;
}

Output:

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