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<cmath>
double sqrt ( double x );
float sqrt ( float x );
long double sqrt ( long double x );
Compute square root
Returns the square root of x.
In C++, this function is overloaded in <complex> and <valarray> (see complex sqrt and valarray sqrt).
Parameters
- x
- Floating point value.
If the argument is negative, a domain error occurs, setting the global variable errno to the value EDOM.
Return Value
Square root of x.
Portability
In C, only the double version of this function exists with this name.
Example
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/* sqrt example */
#include <stdio.h>
#include <math.h>
int main ()
{
double param, result;
param = 1024.0;
result = sqrt (param);
printf ("sqrt(%lf) = %lf\n", param, result );
return 0;
}
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Output:
sqrt(1024.000000) = 32.000000
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See also
| pow | Raise to power (function) |
| log | Compute natural logarithm (function) |
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