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#include <iostream.h>

int main() {
	int num;
  	cout << "\n\nHow many characters do you want me to print per line: ";
	cin >> num;

        { // use of a nameless block to hide a and c
          char a;
          int c;
  	  for (c=1, a='A'; a<='Z'; a++, c++) {	
		cout << a << ((int)c % num == 0 ? "\n" : "\t");
	  }
        }

	cout << "\n\nHit enter to terminate: ";
	cin.ignore(); cin.ignore();

	return 0;
}

a dirtier solution is

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#include <iostream.h>

int main() {
	int num;
  	cout << "\n\nHow many characters do you want me to print per line: ";
	cin >> num;

        for (char c=1, a='A'; a<='Z'; a++, c++) {	
		cout << a << ((int)c % num == 0 ? "\n" : "\t");
        }

	cout << "\n\nHit enter to terminate: ";
	cin.ignore(); cin.ignore();

	return 0;
}

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for (char a = 'A', int c = 0; a <= 'Z'; a++, c++) {	
    cout << a  << (c % num == 0 ? "\t\n" : "\t");
}

for in shorter form

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for (char a = 'A', int c = 0; a <= 'Z'; a++, c++) {	
    cout << a  << (c % num == 0 ? "\t\n" : "\t");
}

for expanded in a while loop

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{
// for initialization clause
  char a='A', // this comma should be a ; */
  int c=0;
// eo for initialization clause

  while (a<='Z') {
    cout << a  << (c % num == 0 ? "\t\n" : "\t");  // for loop

// for increment clause
    a++;
    c++;
// eo for increment clause
  }

dirty solution

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#include <iostream.h>

int main() {
	int num;
  	cout << "\n\nHow many characters do you want me to print per line: ";
	cin >> num;

       for (char c=1, a='A'; a<='Z'; a++, c++) {	
		cout << a << ((int)c % num == 0 ? "\n" : "\t");
	  }
        }

	cout << "\n\nHit enter to terminate: ";
	cin.ignore(); cin.ignore();

	return 0;
}

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#include <iostream>

int main(int argc, char **argv)
{
    int characters_per_line;
    char *characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    
    std::cout << "How many characters do you want me to print per line? ";
    std::cin  >> characters_per_line;
    
    while (*characters) {
        for (int i = 0; i < characters_per_line && *characters; i++) {
            std::cout << *characters++;
            std::cout << "\t";
        }
        
        std::cout << std::endl;
    }
    
    std::cout << "Hit enter to terminate.";
    std::cin.ignore();
    std::cin.ignore();
    
    return 0;
}