visual studio. c language 01

#include <stdio.h>
#include <stdlib.h>
void main()
{
    
    
	int i = 0;
	int j = 12;
	float k = 123.56;

	printf("Hello,world!\r\n");
	printf("k=%f    \r\n",k);
	printf("k=%.1f   \r\n", k);
	printf("k=%.2f   \r\n", k);

	system("pause");
}