C语言非常道 c0609.c 练习6.8

**练习6.8: C语言非常道**

在本题中，我们将学习如何使用 C语言实现一个简单的计算器程序。这个程序将能够执行基本的算术运算，如加、减、乘、除，以及对数字进行平方和立方。

###1. 算术运算函数首先，让我们定义一些函数来完成这些基本的算术运算：

c// 函数声明int add(int a, int b);
int subtract(int a, int b);
int multiply(int a, int b);
double divide(double a, double b);

// 函数实现int add(int a, int b) {
 return a + b;
}

int subtract(int a, int b) {
 return a - b;
}

int multiply(int a, int b) {
 return a * b;
}

double divide(double a, double b) {
 if (b ==0) {
 printf("Error: Division by zero is not allowed.
");
 exit(1); //退出程序 }
 return a / b;
}

c// 函数声明double square(double num);
double cube(double num);

// 函数实现double square(double num) {
 return num * num;
}

double cube(double num) {
 return num * num * num;
}

cint main() {
 int a =10, b =5; // 测试数字 double c =2.0; // 测试双精度数 printf("Addition: %d + %d = %d
", a, b, add(a, b));
 printf("Subtraction: %d - %d = %d
", a, b, subtract(a, b));
 printf("Multiplication: %d * %d = %d
", a, b, multiply(a, b));
 printf("Division: %.1f / %.1f = %.1f
", c,2.0, divide(c,2.0));

 printf("Square of %.1f is %.1f
", c, square(c));
 printf("Cube of %.1f is %.1f
", c, cube(c));

 return0;
}

cAddition:10 +5 =15Subtraction:10 -5 =5Multiplication:10 *5 =50Division:2.0 /2.0 =1.0Square of2.0 is4.0Cube of2.0 is8.0