2020.01-Study_update.2

2020 January 13

Second_week 1.13-1.19

-	Study_update
Mon.	whlie，do whlie①,break②
Tue.
Wed.
Thur.
Fri
Sat
Sun.

1.13 Monday

whlie

With whlie seeking elements of the array and

#include "pch.h"
#include <iostream>
using namespace std;
int sumit(int *parray_begin, int *parray_end);
int sumit(int *parray_begin, int *parray_end)
{
	int sum = 0;
	if (!parray_begin || !parray_end)
		return sum;
	while (parray_begin != parray_end)
		//把当前的值加到sum上
		//然后增加指针，使其指向下一个元素
		sum += *parray_begin++;
	return sum;
}
int main()
{
	
	int ia[3]{ 1,3,3 };
	cout<<sumit(begin(ia), end(ia))；
}

①do whlie

If the control loop is provided in the body of the loop, then use traditional whlie statement must set a value to start the cycle, using Do whlie statement to ensure the implementation of a cycle.

②break

break terminates recent while, do while, for, or switch statement. executive power of the program is passed to the statement immediately after the statement is terminated.