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| #include <stdio.h> | |
| typedef float matrix4x4_t[4][4]; | |
| static float matrix_det(const matrix4x4_t m) | |
| { | |
| return | |
| m[0][3] * m[1][2] * m[2][1] * m[3][0] - m[0][2] * m[1][3] * m[2][1] * m[3][0] - m[0][3] * m[1][1] * m[2][2] * m[3][0]+m[0][1] * m[1][3] * m[2][2] * m[3][0] + | |
| m[0][2] * m[1][1] * m[2][3] * m[3][0] - m[0][1] * m[1][2] * m[2][3] * m[3][0] - m[0][3] * m[1][2] * m[2][0] * m[3][1]+m[0][2] * m[1][3] * m[2][0] * m[3][1] + | |
| m[0][3] * m[1][0] * m[2][2] * m[3][1] - m[0][0] * m[1][3] * m[2][2] * m[3][1] - m[0][2] * m[1][0] * m[2][3] * m[3][1]+m[0][0] * m[1][2] * m[2][3] * m[3][1] + | |
| m[0][3] * m[1][1] * m[2][0] * m[3][2] - m[0][1] * m[1][3] * m[2][0] * m[3][2] - m[0][3] * m[1][0] * m[2][1] * m[3][2]+m[0][0] * m[1][3] * m[2][1] * m[3][2] + | |
| m[0][1] * m[1][0] * m[2][3] * m[3][2] - m[0][0] * m[1][1] * m[2][3] * m[3][2] - m[0][2] * m[1][1] * m[2][0] * m[3][3]+m[0][1] * m[1][2] * m[2][0] * m[3][3] + | |
| m[0][2] * m[1][0] * m[2][1] * m[3][3] - m[0][0] * m[1][2] * m[2][1] * m[3][3] - m[0][1] * m[1][0] * m[2][2] * m[3][3]+m[0][0] * m[1][1] * m[2][2] * m[3][3]; | |
| } | |
| int main(void) | |
| { | |
| int i; | |
| matrix4x4_t mat = { 0 }; | |
| printf("enter a 4x4 matrix line by line\n"); | |
| for(i = 0; i < 4; i++) | |
| scanf("%f %f %f %f", &mat[i][0], &mat[i][1], &mat[i][2], &mat[i][3]); | |
| printf("D = %f\n", matrix_det(mat)); | |
| return 0; | |
| } |
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