Ejemplo043.c

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#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
 
#define N 50
 
int main(int argc, char *argv[])
{
    int i, n;
    double x;
    FILE *fp;
    char filename[N];
    do{
        printf("Ingrese el valor de n: ");
        scanf("%d", &n);
    }while(n<1);
    if(argc==2)
        strcpy(filename, argv[1]);
    else
        strcpy(filename, "Prueba.txt");
    fp = fopen(filename, "wt");
    if(fp==NULL)
        return 1;
    srand(time(NULL));
    fprintf(fp, "%d\n", n);
    for(i=0; i<n; i++)
    {
        x = (1.0*rand())/RAND_MAX;
        fprintf(fp, "%d\t%lf\n", i+1, x);
        printf("x[%d] = %lf\n", i+1, x);
    }
    fclose(fp);
    return 0;
}