Created
March 17, 2013 09:13
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Programa para calcular o determinante de uma matriz NxN
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#include <stdio.h> | |
#include <stdlib.h> | |
int main(void) | |
{ | |
int m = 0; | |
double **a = 0; | |
int i = 0, j = 0, k = 0; | |
double factor = 0; | |
double temp = 0; | |
int count = 0; | |
printf("dimensao => "); | |
scanf("%d", &m); | |
a = (double **) calloc(m, sizeof(double *)); | |
for(i = 0; i < m; i++) | |
{ | |
a[i] = (double *) calloc(m, sizeof(double)); | |
} | |
printf("\n\nEntre com o conteudo da matriz\n\n"); | |
for(i = 0; i < m; i++) | |
{ | |
for(j = 0; j < m; j++) | |
{ | |
printf("A[%d ; %d] => ", i+1, j+1); | |
scanf("%lf", &a[i][j]); | |
} | |
} | |
// mostra a matriz | |
printf("\nMatriz digitada:\n"); | |
for(i = 0; i < m; i++) | |
{ | |
for(j = 0; j < m; j++) | |
{ | |
printf("%8.3f ", a[i][j]); | |
} | |
printf("\n"); | |
} | |
// faz a transformação em um triangulo... | |
for(i = 0; i < m - 1; i++) | |
{ | |
if(a[i][i] == 0) | |
{ | |
for(k = i; k < m; k++) | |
{ | |
if(a[k][i] != 0) | |
{ | |
for(j = 0; j < m; j++) | |
{ | |
temp = a[i][j]; | |
a[i][j] = a[k][j]; | |
a[k][j] = temp; | |
} | |
k = m; | |
} | |
} | |
count++; | |
} | |
if(a[i][i] != 0) | |
{ | |
for(k = i + 1; k < m; k++) | |
{ | |
factor = -1.0 * a[k][i] / a[i][i]; | |
for(j = i; j < m; j++) | |
{ | |
a[k][j] = a[k][j] + (factor * a[i][j]); | |
} | |
} | |
} | |
} | |
temp = 1.0; | |
// Calcula o determinante | |
for(i = 0; i < m; i++) | |
temp *= a[i][i]; | |
printf("\nDeterminante:\n"); | |
if(count % 2 == 0) | |
printf("%8.3f \n", temp); | |
else | |
printf("%8.3f \n", -1.0 * temp); | |
return 0; | |
} |
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The allocated memory was not freed.