Ejemplo022.c File Reference

#include <stdio.h>

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Macros
#define	N   100

Functions
int	main (int argc, char *argv[])

Macro Definition Documentation

N

#define N   100

Definition at line 3 of file Ejemplo022.c.

Function Documentation

main()

int main	(	int	argc,
		char *	argv[] )

Definition at line 5 of file Ejemplo022.c.

{
    int n, i, j, k;
    float A[N][N], b[N], fct, x[N];
    do{
        printf("Ingrese el numero de incognitas: ");
        scanf("%d", &n);
    }while(n<3||n>N);
    for(i=0; i<n; i++)
    {
        for(j=0; j<n; j++)
        {
            printf("A[%d][%d] = ", i+1, j+1);
            scanf("%f", &(A[i][j]));
        }
        printf("b[%d] = ", i+1);
        scanf("%f", &b[i]);
        x[i] = 0;
    }
    for(i=0; i<n; i++)
    {
        printf("%.2fx1", A[i][0]);
        for(j=1; j<n; j++)
        {
            printf("%+.2fx%d", A[i][j], j+1);
        }
        printf("=%.2f\n", b[i]);
    }
    for(i=1; i<n; i++)
        for(j=i; j<n; j++)
        {
            for(k=0, fct=A[j][i-1]/A[i-1][i-1]; k<n; k++)
                A[j][k]-=(fct*A[i-1][k]);
            b[j]-=(fct*b[i-1]);
        }
    /*
    for(i=0; i<n; i++)
    {
        for(j=0; j<n; j++)
            printf("%.2f\t", A[i][j]);
        printf("%.2f\n", b[i]);
    }
    */
    for(i=n-1; i>-1; i--)
    {
        x[i] = b[i];
        for(j=i+1; j<n; j++)
            x[i]-=A[i][j]*x[j];
        x[i]/=A[i][i];
    }
    for(i=0; i<n; i++)
        printf("X[%d] = %f\n", i+1, x[i]);
    return 0;
}

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