# include "stdio.h"
# include"math.h"
main()
{
 int a=9;
 
 printf("%d",sqrt(a));
}
 
运行结果为 0
将输出类型改为浮点型 "%f"
# include "stdio.h"
# include"math.h"
main()
{
 int a=9;
 
 printf("%f",sqrt(a));
}
运行结果为 3.000000
请各位大侠解疑