# C Programming Tutorial

## Two Dimensional Array in C

The two dimensional array in C language is represented in the form of rows and columns, also known as matrix. It is also known as array of arrays or list of arrays.

The two dimensional, three dimensional or other dimensional arrays are also known as multidimensional arrays.

#### Declaration of two dimensional Array in C

We can declare an array in the c language in the following way.

data_type array_name[size1][size2];

A simple example to declare two dimensional array is given below.

int twodimen[3][4];

Here, 3 is the row number and 4 is the column number.

#### Initialization of 2D Array in C

A way to initialize the two dimensional array at the time of declaration is given below.

int arr[4][3]={{1,2,3},{2,3,4},{3,4,5},{4,5,6}};

Two dimensional array example in C

#include<stdio.h>
int main(){
int i=0,j=0;
int arr[4][3]={{1,2,3},{2,3,4},{3,4,5},{4,5,6}};
//traversing 2D array
for(i=0;i<4;i++){
for(j=0;j<3;j++){
printf("arr[%d] [%d] = %d \n",i,j,arr[i][j]);
}//end of j
}//end of i
return 0;
}

Output

arr[0][0] = 1
arr[0][1] = 2
arr[0][2] = 3
arr[1][0] = 2
arr[1][1] = 3
arr[1][2] = 4
arr[2][0] = 3
arr[2][1] = 4
arr[2][2] = 5
arr[3][0] = 4
arr[3][1] = 5
arr[3][2] = 6

#### Two Dimensional Array to store and display values

// C program to store temperature of two cities for a week and display it.
#include <stdio.h>

const int CITY = 2;
const int WEEK = 7;

int main()
{
int temperature[CITY][WEEK];
for (int i = 0; i < CITY; ++i) {
for(int j = 0; j < WEEK; ++j) {
printf("City %d, Day %d: ", i+1, j+1);
scanf("%d", &temperature[i][j]);
}
}

printf("\nDisplaying values: \n\n");
for (int i = 0; i < CITY; ++i) {
for(int j = 0; j < WEEK; ++j)
{
printf("City %d, Day %d = %d\n", i+1, j+1, temperature[i][j]);
}
}
return 0;
}

Output

City 1, Day 1: 33
City 1, Day 2: 34
City 1, Day 3: 35
City 1, Day 4: 33
City 1, Day 5: 32
City 1, Day 6: 31
City 1, Day 7: 30
City 2, Day 1: 23
City 2, Day 2: 22
City 2, Day 3: 21
City 2, Day 4: 24
City 2, Day 5: 22
City 2, Day 6: 25
City 2, Day 7: 26

Displaying values:

City 1, Day 1 = 33
City 1, Day 2 = 34
City 1, Day 3 = 35
City 1, Day 4 = 33
City 1, Day 5 = 32
City 1, Day 6 = 31
City 1, Day 7 = 30
City 2, Day 1 = 23
City 2, Day 2 = 22
City 2, Day 3 = 21
City 2, Day 4 = 24
City 2, Day 5 = 22
City 2, Day 6 = 25
City 2, Day 7 = 26

#### Sum of two matrices using Two dimensional arrays

C program to find the sum of two matrices of order 2*2 using multidimensional arrays.

#include <stdio.h>
int main()
{
float a[2][2], b[2][2], c[2][2];
int i, j;

// Taking input using nested for loop
printf("Enter elements of 1st matrix\n");
for(i=0; i<2; ++i)
for(j=0; j<2; ++j)
{
printf("Enter a%d%d: ", i+1, j+1);
scanf("%f", &a[i][j]);
}

// Taking input using nested for loop
printf("Enter elements of 2nd matrix\n");
for(i=0; i<2; ++i)
for(j=0; j<2; ++j)
{
printf("Enter b%d%d: ", i+1, j+1);
scanf("%f", &b[i][j]);
}

// adding corresponding elements of two arrays
for(i=0; i<2; ++i)
for(j=0; j<2; ++j)
{
c[i][j] = a[i][j] + b[i][j];
}

// Displaying the sum
printf("\nSum Of Matrix:");

for(i=0; i<2; ++i)
for(j=0; j<2; ++j)
{
printf("%.1f\t", c[i][j]);

if(j==1)
printf("\n");
}
return 0;
}

Ouput

Enter elements of 1st matrix

Enter a11: 2;

Enter a12: 0.5;

Enter a21: -1.1;

Enter a22: 2;

Enter elements of 2nd matrix

nter b11: 0.2;

Enter b12: 0;

Enter b21: 0.23;

Enter b22: 23;

Sum Of Matrix:

2.2     0.5
-0.9     25.0

#### Three Dimensional Array

C Program to store values entered by the user in a three-dimensional array and display it.

#include <stdio.h>
int main()
{
// this array can store 12 elements

int i, j, k, test[2][3][2];

printf("Enter 12 values: \n");

for(i = 0; i < 2; ++i) {
for (j = 0; j < 3; ++j) {
for(k = 0; k < 2; ++k ) {
scanf("%d", &test[i][j][k]);
}
}
}

// Displaying values with proper index.

printf("\nDisplaying values:\n");

for(i = 0; i < 2; ++i) {
for (j = 0; j < 3; ++j) {
for(k = 0; k < 2; ++k ) {
printf("test[%d][%d][%d] = %d\n", i, j, k, test[i][j][k]);
}
}
}

return 0;
}

Output

Enter 12 values:

1
2
3
4
5
6
7
8
9
10
11
12

Displaying Values:

test[0][0][0] = 1
test[0][0][1] = 2
test[0][1][0] = 3
test[0][1][1] = 4
test[0][2][0] = 5
test[0][2][1] = 6
test[1][0][0] = 7
test[1][0][1] = 8
test[1][1][0] = 9
test[1][1][1] = 10
test[1][2][0] = 11
test[1][2][1] = 12