LinuxC语言字符函数

/* 
 * File:   main.cpp
 * Author: chenqiang
 *
 * Created on April 1, 2011, 10:40 AM
 */
#include<ctype.h>
#include<stdio.h>

int main() {
   // freopen("out", "w", stdout);
    char str2[] = "123c @# FD\tsP[e?*\n";
    int i;

    //isalnum(int i)测试字符是否为英文字母或数字
    for (i = 0; str2[i] != '\0'; i++) {
        if (isalnum(str2[i])) {
            printf("%c is an alphanumeric character\n", str2[i]);
        }
    }
    printf("\n");

    //isalpha(int i)测试字符是否为英文字母
    for (i = 0; str2[i] != '\0'; i++) {
        if (isalpha(str2[i])) {
            printf("%c is an alphabetic character\n", str2[i]);
        }
    }
    printf("\n");

    //isascii(int i)测试字符是否为ascii码字符
    for (i = 125; i < 130; i++) {
        if (isascii(i)) {
            printf("%d is an ascii character: %c\n", i, i);
        } else {
            printf("%d is not an ascii character\n", i);
        }
    }
    printf("\n");

    //isblank(int i)测试字符是否为空格或tab键
    for (i = 0; str2[i] != '\0'; i++) {
        if (isblank(str2[i])) {
            printf("str2[%d] is blank character:%d\n", i, str2[i]);
        }
    }
    printf("\n");

    //iscntrl(int i)测试字符是否为控制字符，ascii码小于32的字符
    for (i = 0; str2[i] != '\0'; i++) {
        if (iscntrl(str2[i])) {
            printf("str2[%d] is a control character:%d\n", i, str2[i]);
        }
    }
    printf("\n");

    //isdigit(int i)测试字符是否是数字字符
    for (i = 0; str2[i] != '\0'; i++) {
        if (isdigit(str2[i])) {
            printf("str2[%d] is a digit character:%c\n", i, str2[i]);
        }
    }
    printf("\n");

    //isgraph(int i)测试字符是否是可打印字符，不包过空格
    for (i = 0; str2[i] != '\0'; i++) {
        if (isgraph(str2[i])) {
            printf("str2[%d] is a printable character:%c\n", i, str2[i]);
        }
    }
    printf("\n");

    //islower(int i)测试字符是否为英文小写字母
    for (i = 0; str2[i] != '\0'; i++) {
        if (islower(str2[i])) {
            printf("%c is a lower character\n", str2[i]);
        }
    }
    printf("\n");

    //isprint(int i)测试字符是否是可打印字符，包括空格
    for (i = 0; str2[i] != '\0'; i++) {
        if (isprint(str2[i])) {
            printf("str2[%d] is a printable character:%c\n", i, str2[i]);
        }
    }
    printf("\n");

    //isspace(int i)测试字符是否是空格（‘ ’），定位符（'\t'）,CR('\r'),换行('\n'),垂直定位符（'\v）,换页（‘\f'）
    for (i = 0; str2[i] != '\0'; i++) {
        if (isspace(str2[i])) {
            printf("str2[%d] is a white-space character:%d\n", i, str2[i]);
        }
    }
    printf("\n");
    
    //ispunct(int i)测试字符是否为标点符号或特殊符号
    for (i = 0; str2[i] != '\0'; i++) {
        if (ispunct(str2[i])) {
            printf("%c is a punct character\n", str2[i]);
        }
    }
    printf("\n");
    
    //isupper(int i)测试字符是否是英文大写字母
    for (i = 0; str2[i] != '\0'; i++) {
        if (isupper(str2[i])) {
            printf("%c is a upper character\n", str2[i]);
        }
    }
    printf("\n");
    
    //isxdigit(int i)测试字符是否为16进制数字
    for (i = 0; str2[i] != '\0'; i++) {
        if (isxdigit(str2[i])) {
            printf("%c is a hexadecimal digit\n", str2[i]);
        }
    }
  //  fclose(stdout);
}