Program #28 (U3): Count Character Categories in a String
Task: Read a line and count vowels, consonants, digits, spaces, and special characters. Print category-wise totals.
#include <stdio.h>
#include <ctype.h>
int isvowel(int ch) {
ch = tolower(ch);return (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u');
} int main(void) {
char s[512];
int v=0, cons=0, dig=0, sp=0, spec=0, c;
printf("Enter a line: ");
int i=0; while ((c=getchar())!='\n' && c!=EOF) { if(i<511) s[i++]=(char)c; } s[i]='\0';
for (i=0; s[i]; ++i) {
if (isalpha((unsigned char)s[i])) {
if (isvowel(s[i])) ++v; else ++cons;
} else if (isdigit((unsigned char)s[i])) {
++dig;} else if (isspace((unsigned char)s[i])) {
++sp;} else {
++spec; } } printf("Vowels=%d Consonants=%d Digits=%d Spaces=%d Special=%d\n", v, cons, dig, sp, spec);
return 0;
}