Find Inverse of a matrix: C Program

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C program to find the Inverse of a matrix. To find the Matrix Inverse, matrix should be a square matrix and Matrix Determinant is should not Equal to Zero. if A is a Square matrix and |A|!=0, then AA’=I (I Means Identity Matrix). Read more about C Programming Language .

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#include<stdio.h>

#include<math.h>

#include<conio.h>

void main(){

 

int a[3][3],i,j;

float determinant=0;

clrscr();

printf(“Enter the 9 elements of matrix: “);

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

scanf(“%d”,&a[i][j]);

printf(“\nThe matrix is\n”);

}

}

for(i=0;i<3;i++){

printf(“\n”);

for(j=0;j<3;j++)

{

printf(“%d\t”,a[i][j]);

}

}

for(i=0;i<3;i++)

{

determinant = determinant + (a[0][i]*(a[1][(i+1)%3]*a[2][(i+2)%3] – a[1][(i+2)%3]*a[2][(i+1)%3]));

printf(“\nInverse of matrix is: \n\n”);

}

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

printf(“%.2f\t”,((a[(i+1)%3][(j+1)%3] * a[(i+2)%3][(j+2)%3]) – (a[(i+1)%3][(j+2)%3]*a[(i+2)%3][(j+1)%3]))/ determinant);

printf(“\n”);

}

}

getch();

}

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