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#include <stdio.h>
#define NASCII ('~' - '!')
int longest(const int *list, const int length) {
int max = 0;
for (int i = 0; i < length; i++){
if (list[i] > max) max = list[i];
}
return max;
}
void usage() {
fprintf(stderr, "print a histogram of the frequencies of \
ascii characters in stdin (K&R ex 1-14)\n");
fprintf(stderr, " vertical axis is frequency\n");
fprintf(stderr, " horizontal axis is character\n");
}
int main (int argc, char *argv[]) {
if (argc > 1) { usage(); return 0;}
int c, i, j;
int ascii[NASCII] = {0};
while ((c = getchar()) != EOF) {
if (c >= '!' && c <= '~') {
++ascii[c - '!'];
}
}
int max = longest(ascii, NASCII);
// i counts down from the top to the bottom
// (actually from a couple above the top, for padding)
// we start printing each bar as i gets to be within the bar's value
for (i = max + 2; i > 0; i--) {
// side axis
printf("%4d |", i);
for (int j = 0; j < NASCII; ++j)
printf("%s", i <= ascii[j] ? "\u2588" : " ");
printf("\n");
}
// bottom axis
printf(" +");
for (j = '!'; j <= '~'; ++j)
printf("-");
// bottom labels
printf("\n |");
for (j = '!'; j <= '~'; ++j)
printf("%c", j);
printf("\n");
return 0;
}
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