C++輸出各種樣式的三角形

*示例一（號直角三角形）

#include <iostream> using namespace std;int main() {int rows;cout << "輸入行數(shù): ";cin >> rows;for(int i = 1; i <= rows; ++i){for(int j = 1; j <= i; ++j){cout << "* ";}cout << "\n";}return 0; }

輸出結(jié)果

* * * * * * * * * * * * * * *

示例二（數(shù)字直角三角形）

#include <iostream> using namespace std;int main() {int rows;cout << "輸入行數(shù): ";cin >> rows;for(int i = 1; i <= rows; ++i){for(int j = 1; j <= i; ++j){cout << j << " ";}cout << "\n";}return 0; }

輸出結(jié)果

1 1 2 1 2 3 1 2 3 4 1 2 3 4 5

示例三（字母直角三角形）

#include <iostream> using namespace std;int main() {char input, alphabet = 'A';cout << "輸入最后一個大寫字母: ";cin >> input;for(int i = 1; i <= (input-'A'+1); ++i){for(int j = 1; j <= i; ++j){cout << alphabet << " ";}++alphabet;cout << endl;}return 0; }

輸出結(jié)果

A B B C C C D D D D E E E E E

*示例四（號倒直角三角形）

#include <iostream> using namespace std;int main() {int rows;cout << "輸入行數(shù): ";cin >> rows;for(int i = rows; i >= 1; --i){for(int j = 1; j <= i; ++j){cout << "* ";}cout << endl;}return 0; }

輸出結(jié)果

* * * * * * * * * * * * * * *

示例五（數(shù)字倒直角三角形）

#include <iostream> using namespace std;int main() {int rows;cout << "輸入行數(shù): ";cin >> rows;for(int i = rows; i >= 1; --i){for(int j = 1; j <= i; ++j){cout << j << " ";}cout << endl;}return 0; }

輸出結(jié)果

1 2 3 4 5 1 2 3 4 1 2 3 1 2 1

*示例六（號等腰三角形）

#include <iostream> using namespace std;int main() {int space, rows;cout <<"輸入行數(shù): ";cin >> rows;for(int i = 1, k = 0; i <= rows; ++i, k = 0){for(space = 1; space <= rows-i; ++space){cout <<" ";}while(k != 2*i-1){cout << "* ";++k;}cout << endl;} return 0; }

輸出結(jié)果

** * ** * * * ** * * * * * * * * * * * * * * *

示例七（數(shù)字等腰三角形）

#include <iostream> using namespace std;int main() {int rows, count = 0, count1 = 0, k = 0;cout << "輸入行數(shù): ";cin >> rows;for(int i = 1; i <= rows; ++i){for(int space = 1; space <= rows-i; ++space){cout << " ";++count;}while(k != 2*i-1){if (count <= rows-1){cout << i+k << " ";++count;}else{++count1;cout << i+k-2*count1 << " ";}++k;}count1 = count = k = 0;cout << endl;}return 0; }

輸出結(jié)果

12 3 23 4 5 4 34 5 6 7 6 5 4 5 6 7 8 9 8 7 6 5

*示例八（號倒等腰三角形）

#include <iostream> using namespace std;int main() {int rows;cout << "輸入行數(shù): ";cin >> rows;for(int i = rows; i >= 1; --i){for(int space = 0; space < rows-i; ++space)cout << " ";for(int j = i; j <= 2*i-1; ++j)cout << "* ";for(int j = 0; j < i-1; ++j)cout << "* ";cout << endl;}return 0; }

輸出結(jié)果

* * * * * * * * ** * * * * * ** * * * ** * **

示例九（數(shù)字等邊三角形）

#include <iostream> using namespace std;int main() {int rows, coef = 1;cout << "Enter number of rows: ";cin >> rows;for(int i = 0; i < rows; i++){for(int space = 1; space <= rows-i; space++)cout <<" ";for(int j = 0; j <= i; j++){if (j == 0 || i == 0)coef = 1;elsecoef = coef*(i-j+1)/j;cout << coef << " ";}cout << endl;}return 0; }

輸出結(jié)果

11 11 2 11 3 3 11 4 6 4 11 5 10 10 5 1

示例十（數(shù)字三角形）

#include <iostream> using namespace std;int main() {int rows, number = 1;cout << "輸入行數(shù): ";cin >> rows;for(int i = 1; i <= rows; i++){for(int j = 1; j <= i; ++j){cout << number << " ";++number;}cout << endl;}return 0; }

輸出結(jié)果

1 2 3 4 5 6 7 8 9 10

*示例十一（號長等腰三角形）

#include <iostream> using namespace std;int main() {int space, rows = 5;for(int i = 1; i <= rows; ++i){for(space = 1; space <= rows-i; ++space){cout <<" ";}int k = 2*(i-1)+1;while(k>0){cout << "* ";--k;}cout << endl;} return 0; }

輸出結(jié)果

* * * * * * * * * * * * * * * * * * * * * * * * *

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