c program to know a matrix is identity or not | matrix examples in c

Array programs collection C

/* to know a matrix of order n is identity or not

1 0 0

0 1 0

0 0 1

*/

#include<stdio.h>

int main()

{

int n,i,j,is_Identity=0;

printf("enter the size of matrix\n");

scanf("%d",&n);

int matrix[n][n];

printf("enter elements of given matrix\n");

for(i=0;i<=n-1;i++)

{

for(j=0;j<=n-1;j++)

{

scanf("%d",&matrix[i][j]);

}

}

for(i=0;i<=n-1;i++)//loop iteration for row

{

for(j=0;j<=n-1;j++)//loop iteration for column

{

if((i==j && matrix[i][j]!=1)||(i!=j && matrix[i][j]!=0))// checking the condition

// two conditons to bes tested

//Check if the current element is on the diagonal (i == j)

        // In the identity matrix, diagonal elements must be 1

        // Also check if the element is not on the diagonal (i != j)

        // In identity matrix, non-diagonal elements must be 0

is_Identity=1;

break;

}

}

printf("the matrix is:\n");

for(i=0;i<=n-1;i++)

{

for(j=0;j<=n-1;j++)

{

printf("%5d",matrix[i][j]);

}

printf("\n");

}

if(is_Identity==0)

{

printf("The matrix is identity");

}

else

{

printf("the matrix is not identity");

}

return 0;

}

Output:-

c program to know a matrix is identity or not

c program to print sum of two matrices of order mxn | 2D Array-matrix examples

Array programs in C 

/* to find sum of two matrix of order mxn

*/

#include<stdio.h>

int main()

{

int m,n,i,j;

printf("enter m as rows and n as columns\n");

scanf("%d%d",&m,&n);//if m=3 then the loop would run for 0,1,2

int m1[m][n],m2[m][n];

printf("enter elements for first matrix m1\n");

for(i=0;i<=m-1;i++)

{

for(j=0;j<=n-1;j++)

{

printf("enter element for location %d %d\n",i,j);

scanf("%d",&m1[i][j]);

}

}

printf("enter elements for second matrix m2\n");

for(i=0;i<=m-1;i++)

{

for(j=0;j<=n-1;j++)

{

printf("enter element for location %d %d\n",i,j);

scanf("%d",&m2[i][j]);

}

}

printf("the sum of two matrices is:\n");

for(i=0;i<=m-1;i++)

{

for(j=0;j<=n-1;j++)

{

printf("%d",m1[i][j]+m2[i][j]);

}

printf("\n");

}

return 0;

}

Output:-

c program to find sum of two matrices

c program to print transpose of matrix of order 3x2 | 2D Array-matrix examples

 Array programs collections

/* program to find transpose of given matrix of order 3x2

*/

#include<stdio.h>

int main()

{

int matrix[3][2];

int i,j;

for(i=0;i<=2;i++)

{

for(j=0;j<=1;j++)

{

printf("data for %d %d location is:",i,j);

scanf("%d",&matrix[i][j]);

}

}

printf("the matrix before transpose is:\n");

for(i=0;i<=2;i++)

{

for(j=0;j<=1;j++)

{

printf("%d",matrix[i][j]);

}

printf("\n");

}

printf("the matrix after transpose is:\n");

for(i=0;i<=1;i++)

{

for(j=0;j<=2;j++)

{

printf("%d",matrix[j][i]);

}

printf("\n");

}

return 0;

}

Output:

c program to transpose a matrix

c program to print diagonal elements | 2D Array-matrix examples

Array program collection in C

/* program to input elements of a 
matrix of order 3x3 and print only main diagonal elements

 1 2 3

 4 5 6

 7 8 9

 the output would be 1

  5

  6

*/

#include<stdio.h>

int main()

{

int a[3][3];//array/matrix declaration of size 3x3

int i,j;

for(i=0;i<=2;i++)

{

for(j=0;j<=2;j++)

{

printf("enter element for %d %d location",i,j);

scanf("%d",&a[i][j]);//input for matrix

}

}

for(i=0;i<=2;i++)//it is for row

{

for(j=0;j<=2;j++)//it is for column

{

if(i==j) //condition/logic to print the values

printf("%d",a[i][j]);

else

printf(" "); //printing none if the condition is false

}

printf("\n");

}

return 0;

}

Output:-

c program to print diagonal elements

c program to initialize 2D array | 2D Array examples

2D array programs

 /* program to  initialize 2D array*/

#include<stdio.h>
int main()
{
int a[2][2]={{12,13},{14,15}};
int i,j;
for(i=0;i<=1;i++)//for row
{
for(j=0;j<=1;j++)//for columns
{
printf("%3d",a[i][j]);
//%3d means upto 3 trailing spaces
}
printf("\n");
}
return 0;
}

output:-

program to initialize 2D array

c program to copy array elements to another | Array examples

Array programs in C

/* program to copy one array elements to another

*/

#include<stdio.h>

int main()

{

int a[5];

int b[5];

int i;

for(i=0;i<=4;i++)

{

printf("enter elment for %d location",i+1);

scanf("%d",&a[i]);

}

for(i=0;i<=4;i++)

{

b[i]=a[i];

}

printf("the copied elements are:\n");

for(i=0;i<=4;i++)

{

printf(" %d ",b[i]);

}

return 0;

}

Output:-

C program to copy array elements to another array

C Program to Input elements and to find average value using array-1D array concept

 

C program to input elements and to find average 

//array input and printing average value

#include<stdio.h>

int main()

{

int a[5];//array declaration

int i,sum=0;//variable declaration

float average;//float to store average

for(i=0;i<=4;i++)

{

printf(" enter value for location=%d\n",i+1);

scanf("%d",&a[i]);//input for given array

sum+=a[i]; //finding sum

}

average=(float)sum/5; //type casting and storing average in variable

printf("the average value is=%f",average);//printng result

return 0;

}

Output:-

C program to find average of five elements using array

second method:

//array input and printing average value. Here, we will use define for size.

#include<stdio.h>
#define size 5
int main()
{
int a[size];//array declaration with size as an index value. It takes the value from define
int i,sum=0;//variable declaration
float average;//float to store average
for(i=0;i<=4;i++)
{
printf(" enter value for location=%d\n",i+1);
scanf("%d",&a[i]);//input for given array
sum+=a[i]; //finding sum
}
average=(float)sum/5; //type casting and storing average in variable
printf("the average value is=%f",average);//printng result
return 0;
}

C Program – 1D Array Input and Output with Simple Examples

array input in C program 

// 1Dimensional (1D) array input

#include<stdio.h>
int main()
{
int a[5];//array declaration of size 5
int i;
for(i=0;i<=4;i++)//loop
{
printf(" enter value for location=%d\n",i+1);//message display
scanf("%d",&a[i]);//input
}
for(i=0;i<=4;i++)
{
printf("%d\t",a[i]);//printing the values
}
return 0;
}

Output:-