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鍍金池/ 教程/ C/ islower() - C函數(shù)

qsort() - C語言庫函數(shù)

1. qsort() - C語言庫函數(shù)

strxfrm() - C語言庫函數(shù)

1. strxfrm() - C語言庫函數(shù)

difftime() - C語言庫函數(shù)

1. difftime() - C語言庫函數(shù)

isdigit() - C函數(shù)

1. isdigit() - C函數(shù)

<limits.h> - C語言標(biāo)準(zhǔn)庫

1. <limits.h> - C語言標(biāo)準(zhǔn)庫

ldiv() - C語言庫函數(shù)

1. ldiv() - C語言庫函數(shù)

printf() - C語言庫函數(shù)

1. printf() - C語言庫函數(shù)

sin() - C函數(shù)

1. sin() - C函數(shù)

freopen() - C語言庫函數(shù)

1. freopen() - C語言庫函數(shù)

NULL - C函數(shù)

1. NULL - C函數(shù)

mktime() - C語言庫函數(shù)

1. mktime() - C語言庫函數(shù)

floor() - C函數(shù)

1. floor() - C函數(shù)

log() - C函數(shù)

1. log() - C函數(shù)

rewind() - C語言庫函數(shù)

1. rewind() - C語言庫函數(shù)

memcpy() - C語言庫函數(shù)

1. memcpy() - C語言庫函數(shù)

remove() - C語言庫函數(shù)

1. remove() - C語言庫函數(shù)

localtime() - C語言庫函數(shù)

1. localtime() - C語言庫函數(shù)

strcoll() - C語言庫函數(shù)

1. strcoll() - C語言庫函數(shù)

fgets() - C語言庫函數(shù)

1. fgets() - C語言庫函數(shù)

errno - C語言宏

1. errno - C語言宏

<stdlib.h> - C語言標(biāo)準(zhǔn)庫

1. <stdlib.h> - C語言標(biāo)準(zhǔn)庫

labs() - C語言庫函數(shù)

1. labs() - C語言庫函數(shù)

putchar() - C語言庫函數(shù)

1. putchar() - C語言庫函數(shù)

wcstombs() - C語言庫函數(shù)

1. wcstombs() - C語言庫函數(shù)

fclose() - C庫函數(shù)

1. fclose() - C庫函數(shù)

system() - C語言庫函數(shù)

1. system() - C語言庫函數(shù)

strncmp() - C語言庫函數(shù)

1. strncmp() - C語言庫函數(shù)

va_end() - C函數(shù)

1. va_end() - C函數(shù)

setlocale() - C函數(shù)

1. setlocale() - C函數(shù)

strpbrk() - C語言庫函數(shù)

1. strpbrk() - C語言庫函數(shù)

acos() - C函數(shù)

1. acos() - C函數(shù)

fabs() - C函數(shù)

1. fabs() - C函數(shù)

asctime() - C語言庫函數(shù)

1. asctime() - C語言庫函數(shù)

offsetof() - C函數(shù)

1. offsetof() - C函數(shù)

cos() - C函數(shù)

1. cos() - C函數(shù)

atoi() - C語言庫函數(shù)

1. atoi() - C語言庫函數(shù)

strftime() - C語言庫函數(shù)

1. strftime() - C語言庫函數(shù)

va_arg() - C函數(shù)

1. va_arg() - C函數(shù)

strstr() - C語言庫函數(shù)

1. strstr() - C語言庫函數(shù)

<errno.h> - C語言標(biāo)準(zhǔn)庫

1. <errno.h> - C語言標(biāo)準(zhǔn)庫

memchr() - C語言庫函數(shù)

1. memchr() - C語言庫函數(shù)

fopen() - C語言庫函數(shù)

1. fopen() - C語言庫函數(shù)

va_start() - C函數(shù)

1. va_start() - C函數(shù)

fprintf() - C語言庫函數(shù)

1. fprintf() - C語言庫函數(shù)

strrchr() - C語言庫函數(shù)

1. strrchr() - C語言庫函數(shù)

<time.h> - C語言標(biāo)準(zhǔn)庫

1. <time.h> - C語言標(biāo)準(zhǔn)庫

C語言標(biāo)準(zhǔn)庫

1. C語言標(biāo)準(zhǔn)庫

isgraph() - C函數(shù)

1. isgraph() - C函數(shù)

srand() - C語言庫函數(shù)

1. srand() - C語言庫函數(shù)

isprint() - C函數(shù)

1. isprint() - C函數(shù)

fputs() - C語言庫函數(shù)

1. fputs() - C語言庫函數(shù)

sscanf() - C語言庫函數(shù)

1. sscanf() - C語言庫函數(shù)

getc() - C語言庫函數(shù)

1. getc() - C語言庫函數(shù)

<stdarg.h> - C語言標(biāo)準(zhǔn)庫

1. <stdarg.h> - C語言標(biāo)準(zhǔn)庫

rename() - C語言庫函數(shù)

1. rename() - C語言庫函數(shù)

rand() - C語言庫函數(shù)

1. rand() - C語言庫函數(shù)

strspn() - C語言庫函數(shù)

1. strspn() - C語言庫函數(shù)

frexp() - C函數(shù)

1. frexp() - C函數(shù)

bsearch() - C語言庫函數(shù)

1. bsearch() - C語言庫函數(shù)

islower() - C函數(shù)

1. islower() - C函數(shù)

fwrite() - C語言庫函數(shù)

1. fwrite() - C語言庫函數(shù)

ispunct() - C函數(shù)

1. ispunct() - C函數(shù)

vsprintf() - C語言庫函數(shù)

1. vsprintf() - C語言庫函數(shù)

strcspn() - C語言庫函數(shù)

1. strcspn() - C語言庫函數(shù)

fgetpos() - C庫函數(shù)

1. fgetpos() - C庫函數(shù)

getchar() - C語言庫函數(shù)

1. getchar() - C語言庫函數(shù)

tmpfile() - C語言庫函數(shù)

1. tmpfile() - C語言庫函數(shù)

mbtowc() - C語言庫函數(shù)

1. mbtowc() - C語言庫函數(shù)

sprintf() - C語言庫函數(shù)

1. sprintf() - C語言庫函數(shù)

ftell() - C語言庫函數(shù)

1. ftell() - C語言庫函數(shù)

feof() - C庫函數(shù)

1. feof() - C庫函數(shù)

mblen() - C語言庫函數(shù)

1. mblen() - C語言庫函數(shù)

clearerr() - C庫函數(shù)

1. clearerr() - C庫函數(shù)

modf() - C函數(shù)

1. modf() - C函數(shù)

strncat() - C語言庫函數(shù)

1. strncat() - C語言庫函數(shù)

isspace() - C函數(shù)

1. isspace() - C函數(shù)

ctime() - C語言庫函數(shù)

1. ctime() - C語言庫函數(shù)

tmpnam() - C語言庫函數(shù)

1. tmpnam() - C語言庫函數(shù)

isupper() - C函數(shù)

1. isupper() - C函數(shù)

atol() - C語言庫函數(shù)

1. atol() - C語言庫函數(shù)

gets() - C語言庫函數(shù)

1. gets() - C語言庫函數(shù)

<setjmp.h> - C語言標(biāo)準(zhǔn)庫

1. <setjmp.h> - C語言標(biāo)準(zhǔn)庫

perror() - C語言庫函數(shù)

1. perror() - C語言庫函數(shù)

exit() - C語言庫函數(shù)

1. exit() - C語言庫函數(shù)

memmove() - C語言庫函數(shù)

1. memmove() - C語言庫函數(shù)

isalpha() - C函數(shù)

1. isalpha() - C函數(shù)

fsetpos() - C語言庫函數(shù)

1. fsetpos() - C語言庫函數(shù)

fmod() - C函數(shù)

1. fmod() - C函數(shù)

<float.h> - C語言標(biāo)準(zhǔn)庫

1. <float.h> - C語言標(biāo)準(zhǔn)庫

strtok() - C語言庫函數(shù)

1. strtok() - C語言庫函數(shù)

wctomb() - C語言庫函數(shù)

1. wctomb() - C語言庫函數(shù)

strcat() - C語言庫函數(shù)

1. strcat() - C語言庫函數(shù)

atof() - C語言庫函數(shù)

1. atof() - C語言庫函數(shù)

strchr() - C語言庫函數(shù)

1. strchr() - C語言庫函數(shù)

<locale.h> - C語言標(biāo)準(zhǔn)庫

1. <locale.h> - C語言標(biāo)準(zhǔn)庫

signal() - C函數(shù)

1. signal() - C函數(shù)

ungetc() - C語言庫函數(shù)

1. ungetc() - C語言庫函數(shù)

ferror() - C庫函數(shù)

1. ferror() - C庫函數(shù)

C語言標(biāo)準(zhǔn)庫

1. C語言標(biāo)準(zhǔn)庫

strtoul() - C語言庫函數(shù)

1. strtoul() - C語言庫函數(shù)

fseek() - C語言庫函數(shù)

1. fseek() - C語言庫函數(shù)

fscanf() - C語言庫函數(shù)

1. fscanf() - C語言庫函數(shù)

mbstowcs() - C語言庫函數(shù)

1. mbstowcs() - C語言庫函數(shù)

longjmp() - C函數(shù)

1. longjmp() - C函數(shù)

localeconv() - C函數(shù)

1. localeconv() - C函數(shù)

raise() - C函數(shù)

1. raise() - C函數(shù)

ceil() - C函數(shù)

1. ceil() - C函數(shù)

<string.h> - C語言標(biāo)準(zhǔn)庫

1. <string.h> - C語言標(biāo)準(zhǔn)庫

free() - C語言庫函數(shù)

1. free() - C語言庫函數(shù)

setvbuf() - C語言庫函數(shù)

1. setvbuf() - C語言庫函數(shù)

atan() - C函數(shù)

1. atan() - C函數(shù)

C函數(shù)庫宏 assert()

1. C函數(shù)庫宏 assert()

<stdio.h> - C語言標(biāo)準(zhǔn)庫

1. <stdio.h> - C語言標(biāo)準(zhǔn)庫

fread() - C語言庫函數(shù)

1. fread() - C語言庫函數(shù)

vfprintf() - C語言庫函數(shù)

1. vfprintf() - C語言庫函數(shù)

isxdigit() - C函數(shù)

1. isxdigit() - C函數(shù)

toupper() - C函數(shù)

1. toupper() - C函數(shù)

<ctype.h> - C語言標(biāo)準(zhǔn)庫

1. <ctype.h> - C語言標(biāo)準(zhǔn)庫

setjmp() - C函數(shù)

1. setjmp() - C函數(shù)

ldexp() - C函數(shù)

1. ldexp() - C函數(shù)

EDOM - C語言宏

1. EDOM - C語言宏

strlen() - C語言庫函數(shù)

1. strlen() - C語言庫函數(shù)

tolower() - C函數(shù)

1. tolower() - C函數(shù)

clock() - C語言庫函數(shù)

1. clock() - C語言庫函數(shù)

fflush() - C庫函數(shù)

1. fflush() - C庫函數(shù)

fgetc() - C語言庫函數(shù)

1. fgetc() - C語言庫函數(shù)

<stddef.h> - C語言標(biāo)準(zhǔn)庫

1. <stddef.h> - C語言標(biāo)準(zhǔn)庫

div() - C語言庫函數(shù)

1. div() - C語言庫函數(shù)

<math.h> - C語言標(biāo)準(zhǔn)庫

1. <math.h> - C語言標(biāo)準(zhǔn)庫

isalnum() - C函數(shù)

1. isalnum() - C函數(shù)

memset() - C語言庫函數(shù)

1. memset() - C語言庫函數(shù)

calloc() - C語言庫函數(shù)

1. calloc() - C語言庫函數(shù)

vprintf() - C語言庫函數(shù)

1. vprintf() - C語言庫函數(shù)

sqrt() - C函數(shù)

1. sqrt() - C函數(shù)

<assert.h> - C語言標(biāo)準(zhǔn)庫

1. <assert.h> - C語言標(biāo)準(zhǔn)庫

time() C語言

1. time() C語言

atexit() - C語言庫函數(shù)

1. atexit() - C語言庫函數(shù)

memcmp() - C語言庫函數(shù)

1. memcmp() - C語言庫函數(shù)

setbuf() - C語言庫函數(shù)

1. setbuf() - C語言庫函數(shù)

iscntrl() - C函數(shù)

1. iscntrl() - C函數(shù)

abs() - C語言庫函數(shù)

1. abs() - C語言庫函數(shù)

abort() - C語言庫函數(shù)

1. abort() - C語言庫函數(shù)

exp() - C函數(shù)

1. exp() - C函數(shù)

realloc() - C語言庫函數(shù)

1. realloc() - C語言庫函數(shù)

puts() - C語言庫函數(shù)

1. puts() - C語言庫函數(shù)

scanf() - C語言庫函數(shù)

1. scanf() - C語言庫函數(shù)

malloc() - C語言庫函數(shù)

1. malloc() - C語言庫函數(shù)

strerror() - C語言庫函數(shù)

1. strerror() - C語言庫函數(shù)

strtol() - C語言庫函數(shù)

1. strtol() - C語言庫函數(shù)

ERANGE - C語言宏

1. ERANGE - C語言宏

sinh() - C函數(shù)

1. sinh() - C函數(shù)

atan2() - C函數(shù)

1. atan2() - C函數(shù)

putc() - C語言庫函數(shù)

1. putc() - C語言庫函數(shù)

asin() - C函數(shù)

1. asin() - C函數(shù)

strcpy() - C語言庫函數(shù)

1. strcpy() - C語言庫函數(shù)

fputc() - C語言庫函數(shù)

1. fputc() - C語言庫函數(shù)

getenv() - C語言庫函數(shù)

1. getenv() - C語言庫函數(shù)

pow() - C函數(shù)

1. pow() - C函數(shù)

tanh() - C函數(shù)

1. tanh() - C函數(shù)

gmtime() - C語言庫函數(shù)

1. gmtime() - C語言庫函數(shù)

strtod() - C語言庫函數(shù)

1. strtod() - C語言庫函數(shù)

log10() - C函數(shù)

1. log10() - C函數(shù)

strcmp() - C語言庫函數(shù)

1. strcmp() - C語言庫函數(shù)

<signal.h> - C語言標(biāo)準(zhǔn)庫

1. <signal.h> - C語言標(biāo)準(zhǔn)庫

islower() - C函數(shù)

C庫函數(shù) int islower(int c)檢查傳遞的字符是否是小寫字母。

聲明

以下是islower（）函數(shù)的聲明。

int islower(int c);

參數(shù)

c -- 這是要檢查的字符。

返回值

這個函數(shù)如果c是一個小寫字母返回一個非零值（true），否則0（false）

實例

下面的例子顯示islower（）函數(shù)的用法。

#include <stdio.h>
#include <ctype.h>

int main()
{
   int var1 = 'Q';
   int var2 = 'q';
   int var3 = '3';
    
   if( islower(var1) )
   {
       printf("var1 = |%c| is lowercase character
", var1 );
   }
   else
   {
      printf("var1 = |%c| is not lowercase character
", var1 );
   }
   if( islower(var2) )
   {
       printf("var2 = |%c| is lowercase character
", var2 );
   }
   else
   {
      printf("var2 = |%c| is not lowercase character
", var2 );
   }
   if( islower(var3) )
   {
       printf("var3 = |%c| is lowercase character
", var3 );
   }
   else
   {
      printf("var3 = |%c| is not lowercase character
", var3 );
   }
   
   return(0);
}

讓我們編譯和運行上面的程序，這將產(chǎn)生以下結(jié)果：

var1 = |Q| is not lowercase character
var2 = |q| is lowercase character
var3 = |3| is not lowercase character

上一篇：ferror() - C庫函數(shù)下一篇：log() - C函數(shù)

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