#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
 
#define CMD_TAM_MAX   (1024)
 
int systemf( const char * fmt, ... )
{
    va_list args;
    char cmd[ CMD_TAM_MAX + 1 ];
 
    va_start( args, fmt );
    vsnprintf( cmd, CMD_TAM_MAX + 1, fmt, args );
    va_end(args);
 
    return system(cmd);
}
 
int main( void )
{
    int i = 123;
    char ch = 'X';
    char * txt = "Ola Mundo!";
    float pi = 3.1415f;
    double dbl = 1234567890L;
 
    systemf( "echo int: %d", i );
    systemf( "echo char: %c", ch );
    systemf( "echo char*: %s", txt );
    systemf( "echo float: %f", pi );
    systemf( "echo double: %f", dbl );
 
    return 0;
}

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