programming, C-Language, strings?

See below for how I would do this. The assumption you were given, that all characters in the string are letters, is not necessary. As usual, if this is an assignment for a class, I don't recommend handing in my work as if it were your own. I do encourage you to study my code, learn from it, and incorporate my methodology into your own solution.

Here it is:

#include <stdio.h>

#include <string.h>

#define MAX_LINE 80

typedef enum { false = 0, true } bool;

const int maxLen = 10;

bool isConsonant(char);

int main(int argc, char *argv[]) {

char str[MAX_LINE];

int i,numConsonants = 0;

bool inputOk = false;

printf("Enter a string (max length = %d) : ",maxLen);

do {

fgets(str,MAX_LINE,stdin);

if (strlen(str) <= maxLen) {

*strchr(str,'\n') = '\0';

inputOk = true;

} else {

printf("invalid input, try again\n> ");

}

} while (inputOk == false);

for (i = 0; i < strlen(str); i++) {

if (isConsonant(str[i]) == true) ++numConsonants;

}

printf("\n\"%s\" contains %d consonant%c\n",

str,numConsonants,(numConsonants != 1) ? 's' : ' ');

return 0;

}

bool isConsonant(char c) {

static const char consonants[] = "bcdfghjklmnpqrstvwxyz";

return (strchr(consonants,c) != NULL);

}