반올림 함수 round()

1 개요[ | ]

Rounds a float
round
number_format

2 C++[ | ]

#include <iostream>
#include <cmath>
int main() {
    std::cout << round(3.14159) << std::endl;
    // 3
}
#include <iostream>
#include <iomanip>
int main() {
    std::cout << std::setprecision(3) << 3.14159 << std::endl;
    // 3.14
    std::cout << std::setprecision(5) << 123.56789 << std::endl;
    // 123.57
}

3 Excel[ | ]

=ROUND(3.14159,0) // 3
=ROUND(3.14159,2) // 3.14

4 Java[ | ]

int i = Math.round(1.5F); // 2
String str = String.format("%.3f", 1.2345678); // 1.235

5 JavaScript[ | ]

console.log( Math.round(10.6) ); // 11

6 Perl[ | ]

printf("%.3f", 3.1415926535);
# 3.142

7 PHP[ | ]

echo round(7.4);         // 7
echo round(7.5);         // 8
echo round(7.6);         // 8
echo round(7.7, 0);         // 8
echo round(3.14159, 2);  // 3.14
echo number_format(9.98);  // 10
echo number_format(-9.98);  // -10

echo number_format(1, 2); // 1.00

echo number_format(3.14159, 0);  // 3
echo number_format(3.14159, 2);  // 3.14
echo number_format(-3.14159, 0);  // -3
echo number_format(-3.14159, 2);  // -3.14

8 Python[ | ]

print( round(3.14159, 2) )  # 3.14

print( round(7.4) ) # 7
print( round(7.5) ) # 8
print( round(7.6) ) # 8

print( round(7, 0) )      # 7
print( round(7, 1) )      # 7
print( round(7, 2) )      # 7

print( round(7.7, 0) )      # 8.0
print( round(7.7, 1) )      # 7.7
print( round(7.7, 2) )      # 7.7

9 SQL[ | ]

9.1 MySQL[ | ]

SELECT ROUND(2.71828, 2);
-- 2.72

9.2 PostgreSQL[ | ]

10 같이 보기[ | ]

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