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// This program is to use nested for loops 
 
#include <stdio.h>
 
int main (void)
{
	int n, number, triangularNumber; counter;
 
	for ( counter = 1; counter <= 5; ++counter)
		{
			printf ("What triangular number do you want? ");
			scanf ("%i", &number);
 
			triangularNumber = 0;
 
 
			for (n = 1; n <= number; ++n)
				triangularNumber += n;
 
			printf ("Triangular number %i is %i\n\n", number, triangularNumber);
 
		}
 
	return 0;
 
}

prog.c: In function ‘main’:
prog.c:7:35: error: ‘counter’ undeclared (first use in this function)
  int n, number, triangularNumber; counter;
                                   ^~~~~~~
prog.c:7:35: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty