"Learning Notes", "C language" arithmetic operations

There are 34 types of operators in C, including common subtraction operations

1. Addition Operation +

Besides being able to do addition operations, it can also represent a plus sign: +5, +90

2. Subtraction operation-

Besides being able to do subtraction, it can also represent symbols:-10, 29

3. Multiplication Operation *

Note the symbol, not x, but *

4. Division Operations/

Note the symbol, not ÷, nor \, but /

An integer In addition to an integer or an integer. The value of 1/2 is 0, and this is not one-second.

5. Residual operation%

What is the remainder: two integers after dividing

% can only be integers on both sides

Positive and negative depending on% left value

6. Attention Points

1> Automatic type conversion

int a = 10.6;

int B = 10.5 + 1.7;

Automatic conversion of large type to small type, loss of precision

2> Automatic type Promotion

int B = 10.5 + 10;

Lift the 10 on the right to double type

Double b = 1.0/2;

Solve the problem of the precision of division

3> Coercion Type conversions

Double A = (double) 1/2;

Double b = (double) (1/2);

4> Order of Operations

An expression

Adhesion (combination direction): 2+3+4

Priority: 5+4*8-3

Precedence of operators (high-to-low)

Priority level	Describe	Operator
1	Brackets	()、[]
2	PLUS sign	+,-
3	Self-increment, non-	+ + 、--、!
4	multiplication, taking surplus	*、/、%
5	Add and Subtract	+,-
6	Shift Operations	<<, >>, >>>
7	Size relationship	>, >=, <, <=
8	Equality relationship	= =,! =
9	Bitwise-AND	&
10	Bitwise XOR OR	^
11	Bitwise OR	|
12	Logic and	&&
13	Logical OR	||
14	Conditional operations	?:
15	Assignment operations	=, + =,-=, *=,/=,%=
16	Bit assignment operations	&=, |=, <<=, >>=, >>>=

If you want to change the order of operations in the program, you can use ().

7. Course Code

1#include <stdio.h>2 3 intMain ()4 {5     /*1. Basic use of arithmetic operators6 int a = ten + 1 + 2-3 + 5;7    8 int b = -10;9    Ten int c = ten * b; One     A int d = 10/2; -     - //Take-rest operation (modulo operation) the //% are integers on both sides - //% the positive and negative results of the residual result are only related to the value on the left of% - int e = ten%-3; - printf ("%d\n", e); +     */ -     +     /* A //automatic type conversion (Double->int) at int a = 10.8; -     - //coercion type conversion (Double->int) - int b = (int) 10.5; - printf ("%d\n", a); -      */ in     -     //Automatic type lift (int->double) to     Doublec =10.6+6; +  -     DoubleD =1/3; the     *     DoubleE = (Double)3/2; $    Panax Notoginsengprintf"The value of E is%f\n", e); -     the     +     return 0; A}

1#include <stdio.h>2 /*3 prompt the user to enter a time of the number of seconds, such as 500 seconds to enter 500, and then output the corresponding minutes and seconds, such as 500s is 8分钟20秒4 */5 intMain ()6 {7     /*8 //The value of C is fixed to less than 109 int a = 96546546;Ten     One int c = a%; A     */ -     -     //1. Prompt user to enter time theprintf"Please enter a time value (seconds): \ n"); -     -     //2. Time to receive user input -     intTime ; +scanf"%d", &Time ); -     +     //3. Convert to corresponding minutes and seconds A     intminute = time/ -;//minutes at     intSecond = time% -;//seconds -     -printf"%d seconds =%d minutes%d seconds \ n", time, minute, second); -     -     return 0; -}

"Learning Notes", "C language" arithmetic operations