Question

C语言编写程序,完成下面分段函数Y 的计算, x由键盘输入

求分段函数： ┌ x x<1
y= ┤5x – 2 1≤x<12 的值；
└ 8x – 10 x≥12

x由键盘输入。

Answer 1

#include  <stdio.h>



int main(void){

int x;
int y;
scanf("%d",&x);//得到x的值



if(x<1){
	y=x;

}else if (x>=1&&x<12) {
	y=5*x-2;
}else {
	y=8*x-10;
}
printf("y= %d\n",y);



	return 0;
}

Answer 2

float funval(float param){
if(param<1)
return param;
elseif(param>=1&¶m<=12)
return 5*param-2;
elseif(param>=12)
return 8*param-10;

}
int main(){
float x;
printf("请输入x:");
scanf("%f",&x);
prinft("%f",funval(x));
}

Answer 3

#include "stdio.h"

void main()
{
int x;

printf("请输入x：");
scanf("%d", &x);

if( x < 1 )
{
printf("y = %d\n", x);
}
else if( x >= 1 && x < 12 )
{
printf("y = %d\n", 5*x-2);
}
else
{
printf("y = %d\n", 8*x-10);
}

}

Answer 4

#include "stdio.h"
void main()
{
double x,y;
char ch;
loop:
printf("please input x:\n");
scanf("%lf",&x);
if(x<1) printf("y=%lf\n",x);
if(x>=1&&x<12) printf("y=%f\n",5*x-2);
if(x>=12) printf("y=%f\n",8*x-10);
printf("Do you want to input again:(y\\n)");
getchar();
ch=getchar();
if(ch=='y'||ch=='Y') goto loop;
}