C + + 11--console draw isosceles Triangle

Practice some usage of C + + 11 ...

Upper Narrow lower width:

#include <iostream> #include <string> #include <vector>void print (void (*triangle) (int), int params) {    triangle (params);} void (*triangle) (int) = [] (int params) {for    (int i = 0; I <= params; i++)    {for        (int j = params; J >= I; j --)            std::cout << ';        for (int k = 0; k < 2*i + 1; k++)            std::cout << ' * ';        Std::cout << Std::endl;    }}; int main () {    std::vector<int> level{4,5,6,7};    for (auto I:level)    {        print (triangle, i);    }    return 0;}

The width of the upper narrow:

#include <iostream> #include <string> #include <vector>void print (void (*triangle) (int), int params) {    triangle (params);} void (*triangle) (int) = [] (int params) {for    (int i = 0; I <= params; i++)    {for        (int j = 0; J <= I; j + +) 
   std::cout << ";        for (int k = 0; k < (params-i) + 1; k++)            std::cout << ' * ';        Std::cout << Std::endl;    }}; int main () {    std::vector<int> level{4,5,6,7};    for (auto I:level)    {        print (triangle, i);    }    return 0;}

　　

C + + 11--console draw isosceles Triangle