1、函数原型：double log(double x);double log10(double x); 例子：void main( void ){ double x = 9000.0; double y; y = log( x ); printf( "log( %.2f ) = %f", x, y ); y = log10( x ); printf( "log10( %.2f ) = %f", x, y );}输出结果如下：log( 9000.00 ) = 9.104980log10( 9000.00 ) = 3.954243谢谢采纳。