C language input a simple mathematical expression from the keyboard, calculate and display the value of the expression algorithm and program

C language input a simple mathematical expression from the keyboard, calculate and display the value of the expression algorithm and program

I understand a simple mathematical expression: pure number + operator + pure number + (carriage return) and the operator here refers to one of the four kinds of +, -, *, / pure number refers to integer as follows: # include # define numsize 10 / / length of operands int ch_ to_ Num (char a); / / conversion from multi digit number to numeric value

Java from the keyboard input two positive integers m, n composition. Output an integer between M, n (including m, n) the number of prime numbers. (prime number is
Input two positive integers m and N from the keyboard. Output an integer, indicating the number of prime numbers between M and n (including M and N). (prime numbers are numbers that can only be divided by 1 and itself). For example, input 13 and output 2, indicating that there are two prime numbers between 1 and 3

import java.util.Scanner ;public class Test{ public static void main(String args[]) { Scanner scan = new Scanner( System.in ); int count = 0; int num = scan.nextInt (); for(int i = 1;i<=num;i++){...

Mathematical inequality: how to prove: (√ 3) + (√ 8) > 1 + (√ 10)?
Verification: (√ 3) + (√ 8) > 1 + (√ 10)

(√ 3) + (√ 8) > 1 + (√ 10) square of both sides (√ 3 + √ 8) ^ 2 = 3 + 2 √ 24 + 8 = 11 + 2 √ 24 (1 + √ 10) ^ 2 = 1 + 2 √ 10 + 10 = 11 + 2 √ 10 2 √ 24 > 2 √ 10, so (√ 3) + (√ 8) > 1 + (√ 10)

Knowing the hyperbolic analytic formula of a plane, I don't quite understand the process of how to understand the rotating univalent double-sided, rotating bilobed hyperboloid formed by it in space around different coordinate axes

Space analytic geometry? Your problem is too abstract. In this process, you should grasp the distance identity between any point on the curve and the axis of rotation, that is, any plane perpendicular to the axis of rotation cuts a circle

Will the water level rise when the ice is put in the water and melts

Because the density of ice is 0.9 and the density of water is 1. Before the ice melts, the volume of ice immersed in water is 0.9V. After the ice melts, the volume of water becomes 0.9V. The two are equal in size, so the height will not change
If you don't understand it now, you can think about it. If you fill the tank with water in winter, the tank will crack after freezing, which means that the volume of water will become larger after freezing

Can m or f or a be zero in F = ma

Yes, M = 0 is often used in some ideal physical models. In such models, f = 0 is required so that a is not infinite;
F = 0 can be controlled by the outside. In this case, a = 0

How many power of log (8) 1 / 8 is equal to one eighth
How to calculate? How much is the - 2 of 2 equal to?

The - 2 power of 2 = 2 ^ (- 2) = 1 / (2 & sup2;) = 1 / 4;
The - n power of M = m ^ (- n) = 1 / (m ^ n) = 1 / m ^ n;
log(8) 1/8=log(8) (8)^(-1)=-log(8) 8=-1;

The geographical coordinates of a place are 40 degrees north latitude and 116 degrees east longitude. It belongs to (a) northern hemisphere, Eastern Hemisphere, middle latitude (b) northern hemisphere, Western Hemisphere and low latitude

------(A) Northern hemisphere, Eastern Hemisphere, mid latitude
North latitude, naturally, is the northern hemisphere, 40 degrees is between 30-60 degrees, is the middle latitude, 116 degrees east longitude, 20 degrees west longitude to 160 degrees east longitude, so it is the eastern hemisphere
If it's 161 degrees east longitude, it's the Western Hemisphere

Given that the sum of three consecutive even numbers is 2004, what are the three consecutive even numbers?

Let the middle one of the three even numbers be x, the largest one be (x + 2), and the smallest one be (X-2). According to the meaning of the question, we get x + 2 + X + X-2 = 2004, and the solution is: x = 668, ｜ x + 2 = 670, X-2 = 666. A: the three continuous even numbers are 666668670

If the equation x ^ 2 (m-1) x + 4m ^ 2 = 0 about X has two real roots and the two real roots are reciprocal, then the value of M is? The reference answer is - 1 / 2, right

Is the first term of the equation written wrong?
The roots of two real numbers are reciprocal, x1x2 = 1, -- > 4m ^ 2 = 1 > > m = 1 / 2 or - 1 / 2
From the reciprocal and | X1 + x2 | > = 2, we can see that M can only take - 1 / 2 of it,