Dark Horse programmer--c Language--array

One or one-D arrays

Store a group of data of the same type.

1, the definition of the array

Element type array name [number of elements];

1      //It's all right .2     intages[5] = {Ten, One, A, the, About};3     intages[5] = {Ten, One};4     intages[5] = {[3] =Ten, [4] = One};5     intAges[] = {Ten, One, -};6     7     //wrong wording8      intAges[];

2. Initialization of arrays

 1  //  2  //  The  3  int  ages[< can be initialized at the same time as the array is defined Span style= "color: #800080;" >5  ];  4  ages = {10 , 11 , 12 , 14 }; 

 //  correct syntax    can only be initialized at the same time as the array is defined  int  ages[< Span style= "color: #800080;" >5 ] = {10 , 11 , 12 , 14 }; 

1 // correct wording 2     /* 3     int count = 5; 4     int Ages[count]; 5     ages[0] = ten; 6     ages[1] = one; 7     ages[2] =; 8     */

3, the basic use of arrays

1/basic use of arrays2 voidArrayuse ()3 {4     //Array definition Format: type array name [number of elements];5     intages[5] = { +, in, -, -, -};6     //[approx]7ages[1] = in;8     9     /*Ten Ages[0] = +; One ages[1] = +; A ages[2] =; - ages[3] =; - ages[4] = +; the      */ -      -     /* - traverse: View each element of an array sequentially +      */ -      for(inti =0; i<5; i++) +     { Aprintf"ages[%d]=%d\n", I, ages[i]); at     } -}

4. Array in-memory analysis

① size of the array storage space

② Partition of storage space (memory allocation is from high address to low address, but an array of internal elements from low to high)

③ the function of the array name to see the element address

1#include <stdio.h>2 3 /*4 prompts the user to enter 5 students ' scores, calculates the average score and outputs5  */6 7 intMain ()8 {9     Ten      One     //1. Define an array to store the scores A     intscores[5]; -      -     //2. Prompt to enter scores the     //used to store total scores -     intsum =0; -      for(inti =0; i<5; i++) { -         //2.1 Tips for entering a student's score +printf"Please enter the score of%d students: \ n", i +1); -         //2.2 Storage of current student scores +scanf"%d", &scores[i]); A         //2.3 Cumulative Results atSum + =Scores[i]; -     } -      -     //3. Calculate the average score, and the output -printf"average score is%f\n", sum/5.0); -     return 0; in}

5. The relationship between array and function and its application

① Array as a function parameter, you can omit the number of elements

② array as a function parameter, passing is the address of the entire array, modifying the value of the function parameter group element, will affect the outside of the real parameter group

1#include <stdio.h>2 voidChangeintarray[])3 {4     //printf ("array==%p\n", array);5     6array[0] = -;7 }8 9 voidChange2 (intN)Ten { Onen = -; A } -  - intMain () the { -     intages[6] = {Ten, One,Ten, One,Ten, One}; -      -     //printf ("ages==%p\n", ages); +      - Change (ages); +      A     //Change2 (ages[0]); at      -printf"%d\n", ages[0]); -     return 0; -}

Two or two-D arrays

A two-dimensional array is a special one-dimensional array: its elements are one-dimensional arrays

1. Definition and initialization of arrays

1   inta[3][4] = {1,2,3,4,5,6};2   inta[3][4] = {{},{},{}};3 //array elements Simple access4   inta[][5] = {3, +, to,2, +,1};5 6 //Note the error:7   inta[3][4];8a[3] = {};

2. Simple application of two-dimensional array

1 /*2 1 Light Blue3 2 dark blue4 3 Yellow5 4 Red6 -1 No7      */8     9     intcubes[5][5] = {Ten{1, -1, -1, -1, -1}, One{1,1, -1,2, -1}, A{4,1,2,2,2}, -{4,3,3,3,3}, -{4,3,3,3,3} the     }; -     

Dark Horse programmer--c Language--array