069_ctype库函数的使用-1

1. 判断一个字符是否是十进制数组

#include "stdio.h"
#include "ctype.h"

unsigned char s[] = "1234567890abc";

int main(void)
{
    int i = 0;

    while(s[i] != '\0')
    {
        if(isdigit(s[i]))
        {
            printf("%c is a num.\n",s[i]);
        }
        else
        {
            printf("%c is not a num.\n",s[i]);
        }

        i++;
    }

    printf("%d\n",sizeof(s));

    return 0;
}

执行结果：

1. .是否是字母测试

void isalpha_test(void)
{
    unsigned char s[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz123!@'";
    int i = 0;

    while(s[i] != '\0')
    {
        if(isalpha(s[i]))
        {
            printf("%c is a alpha.\n",s[i]);
        }
        else
        {
            printf("%c is a not alpha.\n",s[i]);
        }
        i++;
    }
    
}

测试结果：

1. 数字以及字母检测

void isalnum_test(void)
{
    unsigned char s[] = "abcDFG1230x88_+-";
    int i = 0;

    while(s[i] != '\0')
    {
        if(isalnum(s[i]))
        {
            printf("%c is alnum.\n",s[i]);
        }
        else
        {
            printf("%c is not alnum.\n",s[i]);
        }
        i++;
    }
}

运行结果：

         时间有点晚了，今天总结到此。