isdigit
语法:
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? #include <ctype.h> ? int isdigit( int ch ); |
功能:如果参数是0到9之间的数字字符,函数返回非零值,否则返回零值.
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??? char c; ??? scanf( "%c", &c ); ??? if( isdigit(c) ) ????? printf( "You entered the digit %c\n", c ); |