C－Print a histogram of the frequencies of different characters in its input

蔚落 2023-01-03 14:16 150阅读 0赞

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/*
     * Write a program to print a histogram of the frequencies of different characters 
     * in its input.
     *
     * Histogram_CharFreq.c - by FreeMan
     */
    
    #include <stdio.h>
    
    int main()
    {
    	int freqs[94];
    	int height = 0;
    	int c, i, k;
    
    	for (i = 0; i <= 93; ++i)
    	{
    		freqs[i] = 0;
    	}
    
    	while ((c = getchar()) != EOF)
    	{
    		if (33 <= c && c <= 126)
    		{
    			++freqs[c - 33];
    			if (freqs[c - 33] >= height)
    			{
    				height = freqs[c - 33];
    			}
    		}
    	}
    
    	for (i = height; i > 0; --i)
    	{
    		printf("%4d|", i);
    		for (k = 0; k <= 93; ++k)
    		{
    			if (freqs[k] >= i)
    			{
    				putchar('*');
    			}
    			else
    			{
    				putchar(' ');
    			}
    		}
    		putchar('\n');
    	}
    
    	printf("    +");
    	for (i = 0; i <= 93; ++i)
    	{
    		putchar('-');
    	}
    	printf("\n    ");
    
    	for (i = 0; i <= 93; ++i)
    	{
    		printf("%c", i + 33);
    	}
    	putchar('\n');
    
    	return 0;
    }
    
    // Here's the output of the program when given its own source as input:
    /*
      45|                                                                        *
      44|                                                                        *
      43|                                                                        *
      42|                                                                        *
      41|                                                                        *
      40|                                                                        *
      39|                                                                        *
      38|                                                                        *
      37|                                                                        *
      36|                                                                        *        *
      35|                                                                        *        *
      34|                                                                        *        *
      33|                                                                        *        *
      32|                                                                        *        *
      31|                                                                        *        *
      30|                                                                        *        * *
      29|                                                                        *        * *
      28|                                                                        *        * *
      27|                                                                    *   *        * *
      26|                          *                                         *   *        * *
      25|                          *                                         *   *        * *
      24|                          *                                         *   *        * *
      23|                          *                                         **  *        * *
      22|                          *                                         **  *        * *
      21|       **                 *                                         **  *        * *
      20|       **                 *                                         ** **    *   * *
      19|       **                 *                                       * ** **    *   * *
      18|       **                 * *                                     * ** **    *   * *
      17|       **                 * *                                     * ** **    *   * *
      16|       **                 * *                                   * * ** **    *   * *
      15|       **                 * *                                   * * ** **    *   * *
      14|       **         *       * *                                   * * ** **    *   * *
      13|       **         *       * *                                   * * ** **    *   ***
      12|       ** *       *       * *                                   * * ** **    *** ***
      11|       ** *       *       * *                                   * * ** **    *** ***      * *
      10|      *** *       *       * *                                   * * ** **    *** ***      * *
       9|      *** *       *       * *                                   * * ** **    *** ****     * *
       8| *    *** *    *  *       * *                                   * * *****    ********     * *
       7| *    *** * *  *  *       ***                                   * * *****    ********     * *
       6| *    ***** *  *  *       ***                             * *   * * *****    ********     * *
       5| *    ***** *  *  *     * ***                             * *   * * ***** *  ********     * *
       4| *    *******  *  *     * ****                            * *   * ******* * *********     * *
       3| *    ******** *  *     * ****       *                    ***   * ******* ***********     * *
       2| *  ************  **    * ****       *                    ***   * ******* ***********     * *
       1|*** **************** *  * ****    * ** *    * *       *   *** * ********* *********** * * ***
    	+----------------------------------------------------------------------------------------------
    	!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
    */

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