isprint() – C函数

C库函数 int isprint(int c) 检查传递的字符是否是可打印的。可打印字符一个字符是不是一个控制字符。

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是一个可打印的字符，这个函数返回一个非零值（true），否则返回零（false）

例子

下面的例子显示 int isprint(int c) 函数的用法。

#include<stdio.h>#include<ctype.h>int main(){int var1 ='k';int var2 ='8';int var3 ='	';int var4 =' ';if( isprint(var1)){
printf("var1 = |%c| can be printed
", var1 );}else{
printf("var1 = |%c| can't be printed
", var1 );}if( isprint(var2)){
printf("var2 = |%c| can be printed
", var2 );}else{
printf("var2 = |%c| can't be printed
", var2 );}if( isprint(var3)){
printf("var3 = |%c| can be printed
", var3 );}else{
printf("var3 = |%c| can't be printed
", var3 );}if( isprint(var4)){
printf("var4 = |%c| can be printed
", var4 );}else{
printf("var4 = |%c| can't be printed
", var4 );}return(0);}

让我们编译和运行上面的程序，这将产生以下结果：

var1 = |k| can be printed
var2 = |8| can be printed
var3 = |	| can't be printed
var4 = | | can be printed