C语言输出浮点数的符号、整数部分和小数部分
编写程序，从键盘输入一个不等于0的浮点数，然后分别输出这个浮点数的符号、整数部分和小数部分。例如输入-123.456，输出应该是（按下列格式输出）：
Sign:-
Integral part:123
Decimal fraction part:0.456000
// 方法一：用abs求绝对值和int取整和三目运算符#include "stdio.h"#include "math.h"int main(){double a;int b;double c;scanf("%lf",&a);printf("sign:%c\n",a <0?'-': '+');b=abs((int)a);printf("integral part:%d\n",b);c=a>0? a-b:fabs((a+b));printf("decimal fraction part:%lf\n",c);}
// 方法二：用abs求绝对值和int取整和if判断#include "stdio.h"#include "math.h"int main(){double a;scanf("%lf",&a);if (a<0){printf("sign:-\n");printf("integral part:%d\n",abs(int(a)));printf("decimal fraction part:%f",abs(a-int(a)));}else{printf("sign:+\n");printf("integral part:%d\n",abs(int(a)));printf("decimal fraction part:%f",abs(a-int(a)));}}
// 方法三：用int取整和if判断#include <stdio.h>int main(){double a;scanf("%lf",&a);if (a<0){printf("sign:-\n");printf("integral part:%d\n",int(a)*-1);printf("decimal fraction part:%f",(a-int(a))*-1);}else{printf("sign:+\n");printf("integral part:%d\n",int(a)*-1);printf("decimal fraction part:%f",(a-int(a))*-1);}}
// 方法四：#include <stdio.h>int main(){double a;int b;scanf("%lf",&a);b = a;if (a<0){printf("sign:-\n");printf("integral part:%d\n",b*-1);if (a-b==0){printf("decimal fraction part:%f",(a-b));}else{printf("decimal fraction part:%f",(a-b)*-1);}}else{printf("sign:+\n");printf("integral part:%d\n",b);printf("decimal fraction part:%f",(a-b));}}
