"C Language-Learning Summary" 01-operator

first, the basic Operation1. Arithmetic Operators

A. + addition operator

B.-Subtraction operator

C. * Multiplication operator

D./division operator //Divide two integers, the result is an integer.

E.% take-out operator (modulo operation) //NOTE: 1.  % is an integer 2 on both sides. The positive and negative results of the residual result are only related to the value on the left of%.  

　　Expand the knowledge point:

(1) Automatic type conversion

(2) Forced type conversion

(3) Automatic type promotion

1 //Code Demo:2 34     //divide two integers5int a =7/3;//The result is: 26 7     //% the positive and negative results of the residual result are only related to the value on the left of%8     intb =-7%3;//The result is:-19     intc =7%3;//The result is: 1Ten  One    //Automatic type conversion (Double->int) A     intA =10.8; -  -     //coercion type conversion (Double->int) the     intB = (int)10.5; -  -     //Automatic type lift (int->double) -     Doublec =10.6+6;

2. Relational operators

A. < less operator

B. > Greater than operator

C. <= less than equals operator

D. >= greater than equals operator

E. = = equals operator

F.! = does not equal operator

Note:(1) The result of the relational operation is "true"(for example, 7>=3), return 1 , or "false"(e.g. 7<3), return 0 .

　　　　　　　　　 　　(2) in C , there is no Boolean type, and any value other than 0 is true, and only 0 is false.

//Code Demo:        intA =Ten; //Judging by the results of the relational operation    if(Ten= = a)//Write not recommended: a = = 0;{printf ("conditions established"); }     Else{printf ("conditions are not tenable"); }            

"C Language-Learning Summary" 01-operator