In this tutorial, we will learn about Two dimension Array in Cpp language
In the Cpp programming language, an array is a special data structure of a fixed sequenced collection of the element which contains the same data types. An array can be used to represent a list of number(int, float, double etc..) or name (String) or other data type of similar elements.
We can group element of the similar data type in the single variable name
Three types of arrays are in the c++ programming language
A two-dimensional array is an array within the array. We can simply identify using the table format.
Here, x is a two-dimensional array which contains 5 Rows and 5 Coloum and holds 25 places for the same type of values
int x[5][5];
Here, x is a two-dimensional array, it can hold a maximum 25 elements as int type
Syntax
return_type Array_name[size][size];
Example
int marks[4][5];//it is a two dimensional array, it can hold 20 int type elements char alphabet[5][4]; //it is a two dimensional array, it can hold 20 char type elements
arr[1][2]=34; //insert value 34 to array index arr[1][2]; arr[2][3]=63; //insert value 34 to array index arr[2][3];
or
int marks[2][3]={45,67,46,87,32,35} //method 2 or
int marks[2][3]={{67,43,78}{90,65,67}} //method 3
or
int marks[][3]={{67,43,78}{90,65,67}} //method 4
The easy way to find the index of every elements Two dimension array
Collection of one-dimensional array create of the two-dimensional array
Find index of 2 D array using above diagram
Indices
x[0][0];
x[0][1]
x[0][2]
x[0][3]
x[0][4]
x[0][5]
We can find all index using this way
Example
program 1
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int age[2][3];
age[0][0]=12;
age[0][1]=13;
age[0][2]=14;
age[1][0]=15;
age[1][1]=16;
age[1][2]=17;
cout << "age[0][0] :" <<age[0][0]<< endl;
cout << "age[0][1] :" <<age[0][1]<< endl;
cout << "age[0][2] :" <<age[0][2]<< endl;
cout << "age[1][0] :" <<age[1][0]<< endl;
cout << "age[1][1] :" <<age[1][1]<< endl;
cout << "age[1][2] :" <<age[1][2]<< endl;
getch();
return 0;
} When the above code is executed, it produces the following results:
age[0][0]=12; age[0][1]=13; age[0][2]=14; age[1][0]=15; age[1][1]=16; age[1][2]=17;
Program 2
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int marks[2][5]={{16,65,36,87,54},{64,89,38,65,43}};
// array declaration and initialization in same line
cout<<"Array elements here"<<endl;
cout<<marks[0][0]<<endl;
cout<<marks[0][1]<<endl;
cout<<marks[0][2]<<endl;
cout<<marks[0][3]<<endl;
cout<<marks[0][4]<<endl;
cout<<marks[1][0]<<endl;
cout<<marks[1][1]<<endl;
cout<<marks[1][2]<<endl;
cout<<marks[1][3]<<endl;
cout<<marks[1][4]<<endl;
//print every element stored in array
cout << "End the program" << endl;
getch();
return 0;
} When the above code is executed, it produces the following results:
Array elements here 16 65 36 87 54 64 89 38 65 43 End the program
Display of elements of the array from the two-dimensional array using nested for loop in C++
Input element using for loop to two D array
for(int i=0; i<=max; i++){
for(int j=0; j<=max; j++){
cin>>array_name[i][j];
}
} Display element using for loop to two D array
for(int i=0; i<=max; i++){
for(int j=0; j<=max; j++){
cout<<array_name[i][j];
}
} Program 1
#include <stdio.h>
#include <stdlib.h>
int main()
{
int marks[3][4]=
{
{45,76,87,90},
{43,73,28,85},
{38,76,49,87}
}; //declaration and initialization
int i,j;
for (i=0; i<3; i++){
for (j=0; j<4; j++){
printf("marks[%d][%d] :%d\n",i,j,marks[i][j]);
}//display array elements using for loop
}
printf("end of program\n");
getch();
return 0;
}
When the above code is executed, it produces the following results:
marks[0][0] :45 marks[0][1] :76 marks[0][2] :87 marks[0][3] :90 marks[1][0] :43 marks[1][1] :73 marks[1][2] :28 marks[1][3] :85 marks[2][0] :38 marks[2][1] :76 marks[2][2] :49 marks[2][3] :87 end of program
Program 2
C++ program to store the value entered by the user in two-dimensional array display elements using nested for loop
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int marks[3][4];
cout<<"Enter the marks for Array \n"<<endl;
for(int i=0; i<=2; i++){
for(int j=0; j<=3; j++){
cout<<"marks["<<i<<"]["<<j<<"]"<<":";
cin>>marks[i][j];
}
}
cout<<"\nYou entered :"<<endl;
for(int i=0; i<=2; i++){
for(int j=0; j<=3; j++){
cout<<"marks["<<i<<"]["<<j<<"]" <<":"<<marks[i][j]<<endl;
}
}
getch();
return 0;
}
When the above code is executed, it produces the following results:
Enter the marks for array marks[0][0]:34 marks[0][1]:78 marks[0][2]:89 marks[0][3]:90 marks[1][0]:79 marks[1][1]:95 marks[1][2]:57 marks[1][3]:76 marks[2][0]:34 marks[2][1]:57 marks[2][2]:93 marks[2][3]:58 You entered : marks[0][0]:34 marks[0][1]:78 marks[0][2]:89 marks[0][3]:90 marks[1][0]:79 marks[1][1]:95 marks[1][2]:57 marks[1][3]:76 marks[2][0]:34 marks[2][1]:57 marks[2][2]:93 marks[2][3]:58
Display of elements of the array from the two-dimensional array using nested while loop in C++
Input element using while loop
while(i<=2){
while(j<=2){
cin>>array_name[i][j];
}
} Display elements using while loop
while(k<=2){
while(l<=2){
cout<<array_name[k][l];
}
} We can display the element of the two-dimension array using nested while loop
Program 1
#include <iostream>
using namespace std;
int main()
{
string name[3][4]={
{"Mathu","Jhon","Sali","Maji"},
{"Guru","Kuna","Ram","Ravi"},
{"Roj","Joe","Mariya","mugunth"},
};
int i=0;
cout << "Your employee names\n";
while(i<=2){
int j=0;
while(j<=3){
cout<<name[i][j] << endl;
j++;
}
i++;
}
return 0;
}
When the above code is executed, it produces the following results:
your employees names Mathu Jhon Sali Maji Guru Kuna Ram Ravi Roj Joe Mariya Mugunth
program 2
C++ program to store the value entered by the user in two-dimensional array display elements using nested while loop
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int num[2][3];
cout <<"Enter element for array"<< endl;
int i=0;
while(i<=1){
int j=0;
while(j<=2){
cout <<"num["<<i<<"]["<<j<<"]=";
cin>>num[i][j];
j++;
}
i++;
}
cout << "\n your entered :" << endl;
int k=0;
while(k<=1){
int l=0;
while(l<=2){
cout <<"num["<<k<<"]["<<l<<"]="<<num[k][l]<< endl;
l++;
}
k++;
}
cout << "End of program" << endl;
getch();
return 0;
}
When the above code is executed, it produces the following results:
Enter the elements for array num[0][0]=45 num[0][1]=63 num[0][2]=58 num[1][0]=76 num[1][1]=45 num[1][2]=67 you entered : num[0][0]=45 num[0][1]=63 num[0][2]=58 num[1][0]=76 num[1][1]=45 num[1][2]=67 End the program
Program 3
We can input and display elements of two-dimensional array using nested while loop in C++
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
string names[2][3];
cout <<"Enter name for array"<< endl;
int i=0;
while(i<=1){
int j=0;
while(j<=2){
cout <<"names["<<i<<"]["<<j<<"]=";
cin>>names[i][j];
j++;
}
i++;
}
cout << "\n This names are stored in array :" << endl;
int k=0;
while(k<=1){
int l=0;
while(l<=2){
cout <<"names["<<k<<"]["<<l<<"]="<<names[k][l]<< endl;
l++;
}
k++;
}
cout << "End of program" << endl;
getch();
return 0;
}
When the above code is executed, it produces the following results:
Enter name for array names[0][0]=sumi names[0][1]=sugi names[0][2]=jio names[1][0]=jhoni names[1][1]=jumi names[1][2]=thamana This names are stored in array names[1][0]=sumi names[1][1]=sugi names[1][2]=jio names[0][0]=jhoni names[0][1]=jumi names[0][2]=thamana End of program
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