4

Count the letters in a document

Initializing a table  |  Iterate in a table

clet.c
  1. #include <stdio.h>
  2.  
  3. main( ) {
  4.     int c;
  5.     int i;
  6.  
  7.     int cnt[ 26 ];  /* 26 letters */
  8.  
  9.     /* init counters */
  10.     for ( i = 0; i < 26; i++ )
  11.         cnt[ i ] = 0;
  12.  
  13.     /* read stdin */
  14.     while ( (c = getchar()) != EOF )
  15.         if ( c >= 'a' && c <= 'z' )
  16.             cnt[ c - 'a' ]++;
  17.         else if ( c >= 'A' && c <= 'Z' )
  18.             cnt[ c - 'A' ]++;
  19.  
  20.     /* print counters */
  21.     for ( i = 0; i < 26; i++ )
  22.         printf("%c\t%d\n", 'A'+i, cnt[ i ] );
  23. }

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