C，同时出现无限循环打印错误

Question

I made counting little alphabet program.

However Unintentional result return.

I want "Please enter a character " to be printed once per loop.

#include<stdio.h>
#pragma warning (disable : 4996)

 int main() {
char a;
int b = 0, d = 0;

 while (1) {

    printf("Please enter a character <escape .>");
    scanf("%c", &a);

    if (a == '.')
        break;

    if (a <= 'a' || a >='z') {
        d = d + 1;
        continue;
    }

}

 printf ("Number of lower case letters %d", d);

getchar(); getchar(); getchar();
return 0;}

Please help me

Answer 1

Replace

scanf("%c", &a);

by

scanf(" %c", &a);

Whitespaces were getting consumed by scanf. The use of a blank space in scanf() before %c enables omitting whitespaces.

PS To detect lowercase alphabets, the actual if condition should be

if (a >= 'a' && a <='z')