Question

How to calculate square root (or floor square if not perfect square) of an integer in C

Answer 1

#include <stdio.h>

int sqrt_(int n) { 
    if (n == 0 || n == 1) 
        return n; 
  
    int i = 1, sq = 1; 
    
    while (sq <= n) { 
      i++; 
      sq = i * i; 
    } 
    return i - 1; 
} 
  
int main() 
{ 
    printf("%i\n", sqrt_(9));
    printf("%i\n", sqrt_(5));
    printf("%i\n", sqrt_(26));
    printf("%i\n", sqrt_(16));

    return 0; 
} 



/*
run:

3
2
5
4

*/

 

70+ SQL courses for beginners and professionals