CS256 - Fundamentals of Structured Programming

Displaying exercises/e6/solution/p3.c

#include <stdio.h>

/**
 * Make a program that reads a single character at a time from the input (you
 * can use scanf() or getchar() to do this) in a loop and then counts all the
 * upper and lower case x's and o's in the input then prints the counts of each.
 * 
 * Example input/output:
 * ./p6 < Makefile 
 * X's = 1, O's = 24
 */

int main(void)
{
  char c;
  // Make sure the counters are all set to 0's before we begin:
  int xs = 0, os = 0;

// We could read a character at a time using getchar as well:
//  while ((c = getchar()) != EOF) {

  // Read a character from the input, one at a time:
  while (scanf("%c",&c) == 1) {
    // If it's an 'x' or 'X' increment out xs counter:
    if (c == 'x' || c == 'X') xs = xs + 1;
    // increment os counter if it's an 'o' or 'O':
    if (c == 'o' || c == 'O') os = os + 1;
  }

  // Print the totals outside of the loop:
  printf("X's = %d, O's = %d\n", xs, os);

  return 0;
}