c_ch01_ex14.c

/*Exercise 1-14. Write a program to print a histogram of the frequencies of different characters in its input.*/
#include <stdio.h>
#define INDEX 27
int main()
{
        int histog[INDEX], c;
        for (c = 0;c < INDEX; c++)
                histog[c] = 0;
        while ((c = getchar()) != EOF) {
                switch (c) {
                        case 'a': ++histog[0];
                        break;
                        case 'b': ++histog[1];
                        break;
                        case 'c': ++histog[2];
                        break;
                        case 'd': ++histog[3];
                        break;
                        case 'e': ++histog[4];
                        break;
                        default : ++histog[26];
                }
        }
                printf ("char histogram are histog[a] = %d\n", histog[0]);
                printf ("char histogram are histog[b] = %d\n", histog[1]);
                printf ("char histogram are histog[c] = %d\n", histog[2]);
                printf ("char histogram are histog[d] = %d\n", histog[3]);
                printf ("char histogram are histog[e] = %d\n", histog[4]);
                printf ("char histogram are histog[other] = %d\n", histog[26]);
        return 0;
}