C :

#include<stdio.h>

int main()
{
	printf("*\n");
	printf("**\n");
	printf("***\n");
	printf("****\n");
	return	0;
}

C++ :

#include<stdio.h>
 
int main()
{
printf("*\n"); 
printf("**\n");
printf("***\n");
printf("****\n");
return 0; 
}

Pascal :

program aa;
begin
 writeln('*');
writeln('**');
writeln('***');
write('****');
end.