代码在while循环后不继续

Question

Well,

everything works well here, except of the last printf I call. I want to output the deleted characters in this code:

#include <stdio.h>

int del_lower_vowels(char c) {
    if(c=='a') {
        return 0;
    }
    if(c=='e') {
        return 0;
    }
    if(c=='i') {
        return 0;
    }
    if(c=='o') {
        return 0;
    }
    if(c=='u') {
        return 0;
    }
    else
        return c;
}

int main (void) {
    printf("Enter a string\n");
    int c;
    int del = 0;
    while((c=getchar()) != EOF)
    {
        c = del_lower_vowels(c);
        if(c==0)
        {
            del +=1;
        }
        putchar(c);
    }
    printf("Deleted characters: %d",del);
    return 0;
}

Answer 1

getchar() is blocking when there's no more input available and you're not redirecting stdin from a file. It will simply wait forever until you either do more input, or send an EOF to the terminal with CTRL+D (Linux) or CTRL+Z (Windows).

Answer 2

Just hitting Enter does not close the input stream (standard input in this case), so your program keeps running (which is correct). When I hit Ctrl+D (this sends EOF), I get the number of deleted characters and the program ends.