Calculation of Determinant in C Language
Higher category : 【C Language】 C Language Index
a. GitHub
#include <stdio.h>
#include <stdlib.h>
/* This source is for finding determinant value by using minor determinant expansion */
int det(int n, int (*Matrix)[n]){
if(n == 1) return Matrix[0][0];
int i, j, k;
int minor_Matrix[n][n-1][n-1];
for(k = 0; k < n; k++){
for(i = 0; i < n - 1; i++)
for(j = 0; j < n; j++){
if(j < k)
minor_Matrix[k][i][j] = Matrix[i + 1][j];
else if(j > k)
minor_Matrix[k][i][j - 1] = Matrix[i + 1][j];
}
}
int sum = 0;
int test = 1;
for(k = 0; k < n; k++){
sum += test * Matrix[0][k] * det(n - 1, minor_Matrix[k]);
test *= -1;
}
return sum;
}
int main(void) {
int n, i, j; scanf("%d", &n);
int Matrix[n][n];
for(i = 0; i < n; i++)
for(j = 0; j < n; j++)
scanf("%d", &Matrix[i][j]);
printf("%d", det(n, Matrix));
return 0;
}
Input: 2016.02.24 17:35