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sqrt(x as int) in Math Library Functions of Programming in CPP
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Usage 
The sqrt function is used to return square root of the given value.
Syntax 
sqrt(number);
Example
#include <stdio.h>      
#include <math.h>      

int main ()
{

  printf ("sqrt(49)= %f\n", sqrt (49) );
  return 0;
}
Output 
sqrt(49)=7
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