经典编程900例（c语言）（第二十篇）

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概述

例231：库函数中的除法函数div()

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char const *argv[])
{
// div返回的结构体
div_t result;
result = div(11, 3);
// 输出11/3 商数和余数
printf("11 divided by 3 is %d Remainder %dn", result.quot, result.rem);
// 11 divided by 3 is 3 Remainder 2
return 0;
}

例232：库函数中的浮点操作函数frexp()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
double value = 1.2345;
double mantissa;
int exponent;
//
frexp把一个浮点数分解为尾数和指数, 返回尾数，指数通过指针存入exponent
mantissa = frexp(value, &exponent);
printf("Mantissa %f Exponent %d Value %fn", mantissa, exponent, mantissa * pow(2.0, 1.0 * exponent));
// Mantissa 0.617250 Exponent 1 Value 1.234500
return 0;
}

例233：库函数中的浮点操作函数modf()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
double value = 1.2345;
double int_part;
double fraction;
// modf分解value，以得到value的整数和小数部分，返回小数部分，整数通过指针存入int_part
fraction = modf(value, &int_part);
printf("Value %f Integer part %f Fraction %fn", value, int_part, fraction); // Value 1.234500 Integer part 1.000000 Fraction 0.234500
return 0;
}

例234：库函数中的计算函数ldexp()

#include <stdio.h>
#include <math.h>
/**
* 函数名： double ldexp(double value, int exp);
* 功 能： 计算value乘以2的exp次幂 （ value * ( 2^exp ) ）
* 返回值： 返回计算结果
*/
int main(int argc, char const *argv[])
{
printf("3 * 2 raised to the 4 is %fn", ldexp(3.0, 4));// 3 * 2 raised to the 4 is 48.000000
return 0;
}

例235：取对数函数log10()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
// log10用来取以10为底的对数
printf("Log10 of 100 is %fn", log10(100.0));
// Log10 of 100 is 2.000000
printf("Log10 of 10000 is %fn", log10(10000.0));
// Log10 of 10000 is 4.000000
return 0;
}

例236：指数运算函数pow10()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
// 10的-1次方...
printf("10 raised to -1 is %fn", pow10(-1));
// 10 raised to -1 is 0.100000
printf("10 raised to 0 is %fn", pow10(0));
// 10 raised to 0 is 1.000000
printf("10 raised to 1 is %fn", pow10(1));
// 10 raised to 1 is 10.000000
printf("10 raised to 2 is %fn", pow10(2));
// 10 raised to 2 is 100.000000
return 0;
}

例237：绝对值函数abs()

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char const *argv[])
{
// 5的绝对值...
printf("The absolute value of %d is %dn", 5, abs(5));
// The absolute value of 5 is 5
printf("The absolute value of %d is %dn", 0, abs(0));
// The absolute value of 0 is 0
printf("The absolute value of %d is %dn", -5, abs(-5));
// The absolute value of -5 is 5
return 0;
}

例238：三角运算函数cos()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
// cos(π/2)的值
printf("cosine of pi/2 is %6.4fn", cos(3.14159/2.0));
// cosine of pi/2 is 0.0000
// cos(π)的值
printf("cosine of pi is %6.4fn", cos(3.14159));
// cosine of pi is -1.0000
return 0;
}

例239：e为底的指数函数exp()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
double value;
// exp用来计算以e为底的指数函数
for (value = 0.0; value <= 1.0; value += 0.1)
printf("exp(%f) is %fn", value, exp(value));
return 0;
}

例240：计算自然对数的函数log()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
// log(x) 函数用来计算x的自然对数，也即以e为底的对数
printf("Natural log of 256.0 is %fn", log(256.0)); // Natural log of 256.0 is 5.545177
return 0;
}

例241：次方计算函数pow()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
int power;
// pow(x,y)计算x的y次
for (power = -2; power <= 2; power++)
printf("10 raised to %d is %fn", power, pow(10.0, power));
// 10 raised to -2 is 0.010000
// 10 raised to -1 is 0.100000
// 10 raised to 0 is 1.000000
// 10 raised to 1 is 10.000000
// 10 raised to 2 is 100.000000
return 0;
}

例242：三角运算函数sin()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
double radians;
for (radians = 0.0; radians < 3.1; radians += 0.1)
printf("Sine of %f is %fn", radians, sin(radians));
return 0;
}

例243：三角运算函数tan()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
double pi = 3.14159265;
// tan(π)的值
printf("Tangent of pi is %fn", tan(pi));
// // Tangent of pi is -0.000000
// tan(π/4)的值
printf("Tangent of pi/4 is %fn", tan(pi / 4.0));
// Tangent of pi/4 is 1.000000
return 0;
}

例244：浮点数的绝对值函数fabs()

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
float value;
for (value = -1.0; value <= 1.0; value += 0.1)
printf("Value %f fabs %fn", value, fabs(value));
return 0;
}