编程学习网为您整理以下代码实例，主要实现：C语言isalnum()库函数，希望可以帮到各位朋友。
@H_301_1@// C语言库isalnum()函数
#include <stdio.h>
#include <ctype.h>
int main () {
int var1 = 'd';
int var2 = '2';
int var3 = ' ';
int var4 = ' ';
if( isalnum(var1) ) {
printf("var1 = |%c| is Alphanumeric\n", var1 );
} else {
printf("var1 = |%c| is not Alphanumeric\n", var1 );
}
if( isalnum(var2) ) {
printf("var2 = |%c| is Alphanumeric\n", var2 );
} else {
printf("var2 = |%c| is not Alphanumeric\n", var2 );
}
if( isalnum(var3) ) {
printf("var3 = |%c| is Alphanumeric\n", var3 );
} else {
printf("var3 = |%c| is not Alphanumeric\n", var3 );
}
if( isalnum(var4) ) {
printf("var4 = |%c| is Alphanumeric\n", var4 );
} else {
printf("var4 = |%c| is not Alphanumeric\n", var4 );
}
return(0);
}
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