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#include <stdio.h>
 
int main(void) {
	//Declaración de variables 
	int numero=1;
	int numero=2;
	int numero=3;
	char opcion='';
 
	printf("Escribe el primer numero:\n");
	scanf("%i";numero=1);
	printf("Escribe el segundo numero:\n");
	scanf("%i";numero=2);
	printf("Escribe el tercer numero:\n");
	scanf("%i";numero=3);
 
	//Leemos la opcion
	printf("introduce tu opcion (a:máximo, b:mínimo)");
	scanf("%c";&numero1);
	printf("introduce tu opcion (a:máximo, b:mínimo)");
	scanf("%c";&numero2);
	printf("introduce tu opcion (a:máximo, b:mínimo)");
	scanf("%c";&numero3);
 
 
	if (opcion=='a')
	{
		//Ha introducido una a calculamos el máximo
		if (numero1>numero2)
		if(numero1>numero3)
		printf("\nE1 mayor es el número 1");
		else
		printf("\nE1 mayor es el número 3");
		else
		if (numero2>numero3)
		printf("\nE1 mayor es el número2");
		else
		printf("\nE1 campeon es el número3");
	}
	else
    {
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:6:6: error: redefinition of ‘numero’
  int numero=2;
      ^~~~~~
prog.c:5:6: note: previous definition of ‘numero’ was here
  int numero=1;
      ^~~~~~
prog.c:7:6: error: redefinition of ‘numero’
  int numero=3;
      ^~~~~~
prog.c:6:6: note: previous definition of ‘numero’ was here
  int numero=2;
      ^~~~~~
prog.c:8:14: error: empty character constant
  char opcion='';
              ^~
prog.c:11:12: error: expected ‘)’ before ‘;’ token
  scanf("%i";numero=1);
            ^
            )
prog.c:11:10: warning: format ‘%i’ expects a matching ‘int *’ argument [-Wformat=]
  scanf("%i";numero=1);
         ~^
prog.c:13:12: error: expected ‘)’ before ‘;’ token
  scanf("%i";numero=2);
            ^
            )
prog.c:13:10: warning: format ‘%i’ expects a matching ‘int *’ argument [-Wformat=]
  scanf("%i";numero=2);
         ~^
prog.c:15:12: error: expected ‘)’ before ‘;’ token
  scanf("%i";numero=3);
            ^
            )
prog.c:15:10: warning: format ‘%i’ expects a matching ‘int *’ argument [-Wformat=]
  scanf("%i";numero=3);
         ~^
prog.c:19:12: error: expected ‘)’ before ‘;’ token
  scanf("%c";&numero1);
            ^
            )
prog.c:19:10: warning: format ‘%c’ expects a matching ‘char *’ argument [-Wformat=]
  scanf("%c";&numero1);
         ~^
prog.c:21:12: error: expected ‘)’ before ‘;’ token
  scanf("%c";&numero2);
            ^
            )
prog.c:21:10: warning: format ‘%c’ expects a matching ‘char *’ argument [-Wformat=]
  scanf("%c";&numero2);
         ~^
prog.c:23:12: error: expected ‘)’ before ‘;’ token
  scanf("%c";&numero3);
            ^
            )
prog.c:23:10: warning: format ‘%c’ expects a matching ‘char *’ argument [-Wformat=]
  scanf("%c";&numero3);
         ~^
prog.c:29:7: error: ‘numero1’ undeclared (first use in this function); did you mean ‘numero’?
   if (numero1>numero2)
       ^~~~~~~
       numero
prog.c:29:7: note: each undeclared identifier is reported only once for each function it appears in
prog.c:29:15: error: ‘numero2’ undeclared (first use in this function); did you mean ‘numero’?
   if (numero1>numero2)
               ^~~~~~~
               numero
prog.c:30:14: error: ‘numero3’ undeclared (first use in this function); did you mean ‘numero’?
   if(numero1>numero3)
              ^~~~~~~
              numero
prog.c:43:1: error: expected declaration or statement at end of input
 }
 ^
prog.c:7:6: warning: unused variable ‘numero’ [-Wunused-variable]
  int numero=3;
      ^~~~~~
prog.c:11:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i";numero=1);
  ^~~~~~~~~~~~~~~~~~~~
prog.c:13:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i";numero=2);
  ^~~~~~~~~~~~~~~~~~~~
prog.c:15:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i";numero=3);
  ^~~~~~~~~~~~~~~~~~~~
prog.c:19:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%c";&numero1);
  ^~~~~~~~~~~~~~~~~~~~
prog.c:21:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%c";&numero2);
  ^~~~~~~~~~~~~~~~~~~~
prog.c:23:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%c";&numero3);
  ^~~~~~~~~~~~~~~~~~~~

Standard output is empty