两种方法：实现输入一行字符 统计数字字符 英文字母和其他字符的个数（C语言）

C语言中：gets和getchar的区别以及指针的运用

方法一：

使用gets实现

#include<stdio.h>

void main()

{

char str[80], * p;

int digit,letter,other;

gets(str);

p = str;

digit = letter = other = 0;

while (*p != '\0')

{

if ((*p >= 'A' && *p <= 'Z')|| (*p >= 'a' && *p <= 'z'))

letter++;

else if (*p >= '0' && *p <= '9')

digit++;

else

other;

p++;

}

printf("digit=%d letter=%d other=%d\n", digit, letter, other);

}

方法二：

使用getchar实现

#include<stdio.h>

void count(char* s, int* digit, int* letter, int* other)

{

*digit = *letter = *other = 0;

while (*s!='\0')

{

if (*s >= '0' && *s <= '9')

(*digit)++;

else if ((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z'))

(*letter)++;

else

(*other)++;

s++;

}

}

void main()

{

int i = 0, digit, letter, other;

char ch, str[80];

printf("Enter characters:\n");

ch = getchar();//getchat读取字符

while (ch !='\n')

{

str[i] = ch;

i++;

ch = getchar();

}

str[i] = '\0';

count(str, &digit, &letter, &other);

printf("digit=%d letter=%d other=%d\n", digit, letter, other);

}