#include <stdio.h>
void Usage() {
    fprintf(stdout,"Usage: suma arg1 [arg2..argn]\n");
    fprintf(stdout,"Este programa trasnforma todos los parametros en ints y los suma, sino, da error\n");

}
void main(int argc,char *argv[])
{
    int i,j, cont = 1, res = 0;
    if (argc == 1) Usage();
    else {
        for (i=1;i<argc;i++)
        {
            if (argv[i][0] !='-' && (argv[i][0] < '0' || argv[i][0] > '9'))
                res = -1;
            else
                @h@if (strlen(*argv[i]) > 1) {
                    for (j = 1; j < strlen(argv[i])-1;++i)
                        if (argv[i][j] < '0' || argv[i][j] > '9')
                        res = -1;
                }
            if (res == -1) fprintf(stdout,"Error: el parametro %s no es un numero\n",argv[i]);
            else (argv[i][0] !='-')
                {
                for (j = 1; j < strlen(argv[i]); ++j)
                {
                    cont *= -10;
                    cont -= argv[i][j];
                }
                cont += argv[i][0];
                for (j = 1; j < strlen(argv[i]); ++j)
                {
                    cont *= 10;
                    cont += argv[i][j];
                }
            res += cont;
        }
    }
    fprintf(stdout,"La suma es %d\n",res);
}