有兩種結(jié)構(gòu)可以選擇
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1.if
{}
else if
{}
else if
2.switch
case:
case:
case:
#include?"stdio.h"
#include?"math.h"
int?main(int?argc,char?*argv[]){
double?x,y;
printf("Input?x(R:)...\nx=");
scanf("%lf",x);
if(x5)
y=-x+3.5;
else?if(x=5??x10)
y=20-3.5*pow(x+3,7);//這里看著像7,是幾就把7改成幾
else
y=-3.5+sin(x);
printf("y?=?%g\t(x==%g)\n",y,x);
return?0;
}
運(yùn)行樣例:
#include
int?main()
{
int?x,y;
scanf("%d",x);
if(0xx10)?y=3*x+2;
else
{if(x=0)?y=0;
else
{if?(x0)?y=x*x;
else?printf("go?die\n");
}
}
printf("%d",y);
return?0;
}該程序的分段函數(shù)如下:
f(x)=3x+2? (0x10)
f(x)=1???????? (x=0)
f(x)?=?x*x??? (x0)
#include stdio.h
#include math.h
void main()
{
float x;
double y;
printf("Please input the value of x:");
scanf("%f",x);
if(x=-10x=4)
{
y=fabs(x-2);
printf("y=%.2f\n",y);
}
else if(x=5x=7)
{
y=x+10;
printf("y=%.2f\n",y);
}
else if(x=8x=12)
{
y=pow(x,4);
printf("y=%.2f\n",y);
}
else
printf("No answer\n");
}
#include iostream
#include cmath
int main()
{
using namespace std;
cout"請(qǐng)輸入x的值(x10):";
double x,y;
cinx;
int n;
if(x=10x20)
n=1;
else if(x=20x30)
n=2;
else if(x=30x40)
n=3;
else if(x=40x50)
n=4;
else if(x=50)
n=5;
switch(n)
{
case 1:
y=log10(x);
break;
case 2:
y=log10(x)/log10(3);
break;
case 3:
y=cos(x);
break;
case 4:
y=pow(x,5);
break;
case 5:
y=1.0/tan(x);
break;
default:
cout"\n你輸入的值不在取值范圍內(nèi),再見!\n";
break;
}
if(x10)
cout"\n本函數(shù)的y值為:"y"。*^o^*\n";
return 0;
}