C++ cout格式化輸出（輸出格式）完全攻略

字串和 I/O 格式化 (現代 C++)

800

using namespace std;

int main(int argc, char** argv) {

cout << hex << 59 << "," << 62 << endl;

int n = 141;

//1) 分別以十六進位制、十進位制、八進位制先後輸出 n

cout << "1)" << hex << n << " " << dec << n << " " << oct << n << "\n"; //endl;

double x = 1234567.89, y = 12.3456;

//2)保留5位有效數位

cout << "2)" << setprecision(5) << x << " " << y << " " << endl;

//3)保留小數點後面5位

cout << "3)" << fixed << setprecision(5) << x << " " << y << endl;

//4)科學計數法輸出，且保留小數點後面5位

cout << "4)" << scientific << setprecision(5) << x << " " << y << endl;

return 0;

}