C 和指针编程练习 4.1
#include <stdio.h>#include <stdlib.h>
int
main(void)
{
float new_guess;
float last_guess;
float number;
printf("Enter a number: ");
scanf("%f", &number);
if (number < 0) {
printf("Cannot compute the square root of a negative number !\n");
return EXIT_FAILURE;
}
new_guess = 1;
do {
last_guess = new_guess;
new_guess = (last_guess+number/last_guess) / 2;
printf("%.15e\n", new_guess);
} while (new_guess != last_guess); //这个地方为什么能直接用!=比较两个浮点变量？
printf("Square root of %g is %g\n", number, new_guess);
return EXIT_SUCCESS;
}
