isalnum
语法:
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? #include <ctype.h> ? int isalnum( int ch ); |
功能:如果参数是数字或字母字符,函数返回非零值,否则返回零值。
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??? char c; ??? scanf( "%c", &c ); ??? if( isalnum(c) ) ????? printf( "You entered the alphanumeric character %c\n", c ); |