Function in C. Having trouble outputing correct number

What i have************************************************

double compute_sqrt(double x) {

/* 2. This function computes the square root of a number. */

double next;

double last=1;

for(int i=1;i

next=0.5 *(last + x/last);

last=next;

}

return last;

}

int main() {

int test;

int x=1;

double n;

double k;

while(x==1) {

printf("Enter a positive integer: ");

scanf("%lf", &n);

k= compute_sqrt(n);

printf("Factorial of %lf", k);

}

printf(" Exiting program. ");

return 0;

}

When I enter 36, it should give me 6 but i doesnt. When i tranfered the code to java, it works, but doesnt in c.

2. Write a function that computes the square root of a number. The square root of a number x can be approximately computed as follows. First guess that the square root of x is 1. Then repeatedly get the next guess from the last guess using the rule next 0.5(last+ x/last) where last is the last guess and next is the next guess. Repeat ten times using a loop and the tenth guess will be approximately the square root. The function prototype is double compute sqrt (double x). The function computes the square root of x and returns the square root