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using namespace std;
 
 
 
main()
 
{
 
 
 
	int i;
 
	int n;
 
	int valor;
 
 
 
 
 
	cout<<"introduzca valor (1-7)"<<endl;
 
	cin>>valor;
 
	cout<<endl;
 
 
 
	for(i=1;i<=valor;i++){
 
		for(n=1;i>=n;n++)
 
			 cout<<"*";
 
			cout<<"\n";
 
		//printf("\n");
 
 
 
	}
 
 
 
}

prog.c:1:1: error: unknown type name ‘using’
 using namespace std;
 ^~~~~
prog.c:1:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘std’
 using namespace std;
                 ^~~
prog.c:5:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
 main()
 ^~~~
prog.c: In function ‘main’:
prog.c:21:2: error: ‘cout’ undeclared (first use in this function)
  cout<<"introduzca valor (1-7)"<<endl;
  ^~~~
prog.c:21:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:21:34: error: ‘endl’ undeclared (first use in this function)
  cout<<"introduzca valor (1-7)"<<endl;
                                  ^~~~
prog.c:23:2: error: ‘cin’ undeclared (first use in this function)
  cin>>valor;
  ^~~

Standard output is empty