When entering a character, how to determine whether it is a letter, number or special character?

How to determine if a character is a letter, number or special character

The method is as follows:

1. Use format Use the symbol %c to get the input character;

2. Just determine the position of the character in the ascii code table.

#include <stdio.h>

int main(){
    char ch;

    printf("请输入一个字符");
    scanf("%c",&ch);

    if(ch >= &#39;a&#39; && ch <= &#39;z&#39; || ch >= &#39;A&#39; && ch <= &#39;Z&#39;){
        //字母的取值范围
        printf("%c是一个字母\n",ch);
    }else if(ch >= &#39;0&#39; && ch <= &#39;9&#39;){
        //数字的取值范围
        printf("%c是一个数字\n",ch);
    }else{
      printf("%c是一个特殊字符\n",ch);
    }
    return 0;
}

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