C语言 <ctype.h> isprint() 函数



  • 描述

    C库函数int isprint(int c) 检查所传递的字符是否可打印。可打印字符是不是控制字符的字符。
  • 声明

    以下是isprint()函数的声明。
    
    int isprint(int c);
    
    
    参数
    • c - 这是要检查的字符。
  • 返回值

    如果c是可打印字符,则此函数返回非零值(true),否则返回零(false)。
    示例
    以下示例显示isprint()函数的用法-
    
    #include <stdio.h>
    #include <ctype.h>
    
    int main () {
       int var1 = 'k';
       int var2 = '8';
       int var3 = '\t';
       int var4 = ' ';
        
       if( isprint(var1) ) {
          printf("var1 = |%c| can be printed\n", var1 );
       } else {
          printf("var1 = |%c| can't be printed\n", var1 );
       }
       
       if( isprint(var2) ) {
          printf("var2 = |%c| can be printed\n", var2 );
       } else {
          printf("var2 = |%c| can't be printed\n", var2 );
       }
       
       if( isprint(var3) ) {
          printf("var3 = |%c| can be printed\n", var3 );
       } else {
          printf("var3 = |%c| can't be printed\n", var3 );
       }
       
       if( isprint(var4) ) {
          printf("var4 = |%c| can be printed\n", var4 );
       } else {
          printf("var4 = |%c| can't be printed\n", var4 );
       }
       
       return(0);
    }   
    
    
    让我们编译并运行上述程序,以产生以下结果-
    
    var1 = |k| can be printed                                                   
    var2 = |8| can be printed                                                   
    var3 = |        | can't be printed                                          
    var4 = | | can be printed