The fifth Bureau, akali teaching Bureau

// Write a question that you can calculate the total scores of Chinese and Mathematics for your third grade brother Code

#include<stdio.h>
int main()
{
	int chinese = 0;
	int math = 0;
	scanf_s("%d %d", &chinese, &math);
	int sum = chinese + math;
	printf("sum = %d\n", sum);
	return 0;
}

/ If you want to calculate the total score of Chinese and Mathematics for the whole class ？ List the repeated codes , That's a lot low ah And that's where it comes in function

#include<stdio.h>
int ADD(int chinese, int math) //int  Function type ;ADD Function name ;（ Function parameter 1, Function parameter 2）
{
	return chinese + math;//return Function return value type      
}
// Like what to eat   Pull what    meat （ Acid food ） Eat into your stomach    Excretion is acidic 
int main()
{
	int chinese = 0;
	int math = 0;
	scanf_s("%d %d", &chinese, &math);
	int sum =ADD(chinese, math);
	printf("sum =  %d\n", sum);
	return 0;
}

  function ：

/*----------------------------------------------------------------

     As mentioned earlier One dimensional array , It can be understood as X Axis ; Two dimensional array It is the X-Y Axis （ Plane coordinate system ）
*/

#include<stdio.h>
int main()
{
	int group[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };// One dimensional array 
	int group_two[][3] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };// Two dimensional array    Equivalent to three rows and three columns 
	// Visit a one-dimensional array   
	printf("%d\n", group[0]);
	printf("%d\n", group[1]);
	printf("%d\n", group[2]);
    // Access 2D array 
	printf("%d\n", group_two[2][0]);// visit [][] You have to write the subscript 
	return 0;
}

Execution results ： 

 // Take one-dimensional array for example , The subscript is from 0 At the beginning , You want to get 1, Is access group[0],o Subscript at , And so on

Two dimensional array writing ：

Two dimensional array subscript ：

#include<stdio.h>
int main()
{
	int group[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };// One dimensional array 
	int group_two[][3] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };// Two dimensional array    Equivalent to three rows and three columns 
	 Visit a one-dimensional array   
	//printf("%d\n", group[0]);
	//printf("%d\n", group[1]);
	//printf("%d\n", group[2]);
	// Access one-dimensional array in a circular way   The same goes for two-dimensional arrays 
	int frequency = 0;
	while (frequency < 9) {
		printf("%d\n", group[frequency]);
		frequency++;
	}
	// Calculate the total size of the array    Calculate the size of an element 
	printf("group = %d\n", sizeof(group));//9 Elements , One int Occupy 4 Bytes   4*9=36
	printf("group[0]=%d\n", sizeof(group[0]));//4

	// Calculate the total size of the array  /  Calculate the size of an element  =  Element number 
	int number = sizeof(group) / sizeof(group[0]);
	printf("number = %d\n", number);
	 Access 2D array 
	//printf("%d\n", group_two[2][0]);// visit [][] You have to write the subscript 


	// Take one-dimensional array for example , The subscript is from 0 At the beginning , You want to get 1, Is access group[0],o Subscript at , And so on 
	return 0;
}

  Second half ： The pointer + Structure   To rush ！！！