ex05_03.c

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

/* ex05_03.c */
/* Testing the math library functions */
#include <stdio.h>
#include <math.h>

/* function main begins program execution */
int main( void )
{
   /* calculates and outputs the square root */
   printf( "sqrt(%.1f) = %.1f\n", 900.0, sqrt( 900.0 ) );
   printf( "sqrt(%.1f) = %.1f\n", 9.0, sqrt( 9.0 ) );
   
   /* calculates and outputs the exponential function e to the x */
   printf( "exp(%.1f) = %f\n", 1.0, exp( 1.0 ) );
   printf( "exp(%.1f) = %f\n", 2.0, exp( 2.0 ) );
   
   /* calculates and outputs the logorithm (base e) */
   printf( "log(%f) = %.1f\n", 2.718282, log( 2.718282 ) );
   printf( "log(%f) = %.1f\n", 7.389056, log( 7.389056 ) );
   
   /* calculates and outputs the logorithm (base 10) */
   printf( "log10(%.1f) = %.1f\n", 1.0, log10( 1.0 ) );
   printf( "log10(%.1f) = %.1f\n", 10.0, log10( 10.0 ) );
   printf( "log10(%.1f) = %.1f\n", 100.0, log10( 100.0 ) );
   
   /* calculates and outputs the absolute value */
   printf( "fabs(%.1f) = %.1f\n", 13.5, fabs( 5.0 ) );
   printf( "fabs(%.1f) = %.1f\n", 0.0, fabs( 0.0 ) );
   printf( "fabs(%.1f) = %.1f\n", -13.5, fabs( -5.0 ) );
   
   /* calculates and outputs ceil( x ) */
   printf( "ceil(%.1f) = %.1f\n", 9.2, ceil( 9.2 ) );
   printf( "ceil(%.1f) = %.1f\n", -9.8, ceil( -9.8 ) );
   
   /* calculates and outputs floor( x ) */
   printf( "floor(%.1f) = %.1f\n", 9.2, floor( 9.2 ) );
   printf( "floor(%.1f) = %.1f\n", -9.8, floor( -9.8 ) );
   
   /* calculates and outputs pow( x, y ) */
   printf( "pow(%.1f, %.1f) = %.1f\n", 2.0, 7.0, pow( 2.0, 7.0 ) );
   printf( "pow(%.1f, %.1f) = %.1f\n", 9.0, 0.5, pow( 9.0, 0.5 ) );
   
   /* calculates and outputs fmod( x, y ) */
   printf( "fmod(%.3f/%.3f) = %.3f\n", 13.675, 2.333, 
           fmod( 13.675, 2.333 ) );

   /* calculates and outputs sin( x ) */
   printf( "sin(%.1f) = %.1f\n", 0.0, sin( 0.0 ) );
   
   /* calculates and outputs cos( x ) */
   printf( "cos(%.1f) = %.1f\n", 0.0, cos( 0.0 ) );
   
   /* calculates and outputs tan( x ) */
   printf( "tan(%.1f) = %.1f\n", 0.0, tan( 0.0 ) );
   
   return 0; /* indicates successful termination */

} /* end main */


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