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Exercise 1-13 from The C Programming Language: by Brian W. Kernighan, Dennis M. Ritchie "Write a program to print a histogram of the lengths of words in its input. It is easy to draw the historgram with the bars horizontal; a vertical orientation is more challenging."
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#include <stdio.h> | |
//In a word or not | |
#define IN 1 | |
#define OUT 0 | |
#define MAXLENGTH 100 | |
// Write a program to print a histogram of the lengths of words in its input. It is easy to draw the historgram with the bars horizontal; a vertical orientation is more challenging. | |
main(){ | |
//Maximum word length is 100, far more than neccesary | |
int wordlengths[MAXLENGTH]; | |
int i,j, c, wlength,state,maxfound; | |
i = j = c = wlength = maxfound = 0; | |
state = OUT; | |
//initialize | |
for (i = 0; i < MAXLENGTH; ++i) | |
wordlengths[i] = 0; | |
while((c = getchar()) != EOF){ | |
if(c == '\n' || c == '\t' || c == ' '){ | |
state = OUT; | |
if( wlength > 0 && wlength < MAXLENGTH ){ | |
if (wlength > maxfound) | |
maxfound = wlength; | |
wordlengths[wlength]++; | |
} | |
wlength = 0; | |
}else{ | |
state = IN; | |
wlength++; | |
} | |
} | |
//Print out histogram vertically | |
printf("Word Length Histogram\n"); | |
for(i = 0; i < maxfound; ++i) | |
printf("___"); | |
printf("\n"); | |
for(i = maxfound; i > 0; --i){ | |
printf("%2d",i ); | |
for(j=0; j <= maxfound; ++j){ | |
//Run through the list | |
if(wordlengths[j] >= i){ | |
printf("|%2s",""); | |
}else{ | |
printf("%3s",""); | |
} | |
} | |
printf("\n"); | |
} | |
for(i =0; i <= maxfound; ++i){ | |
if(i <= 10){ | |
printf("%2s%d","",i); | |
}else{ | |
printf("%3d",i); | |
} | |
} | |
printf("\n"); | |
for(i = 0; i < maxfound; ++i) | |
printf("___"); | |
printf("\n"); | |
} |
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