C + + 11 range-based for loop

Range-based for loop:
For built-in arrays and classes (such as std::string) and STL containers that contain method begin () and end (), scope-based for loops can simplify the work of writing loops for them. This loop performs the specified action on each element in the array or container:

#include <iostream>int main(){    double prices[5] = {4.99,10.99,6.87,7.99,8.49};    for (double x : prices)       std::coutstd::endl;    return0;}

where x will sequentially be the value of each element in prices. The type of x should match the type of the array element. An easier and more secure way is to use Auto to declare x, so the compiler infers the type of x based on the information declared by prices:

for (auto x : prices)    std::coutstd::endl;

If you want to modify each element of an array or container in a loop, you can use a reference type:

std::vector<int> vi(6);for (auto &x : vi)    std::rand();

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C + + 11 range-based for loop