c语言课后习题答案.docx

7#2305950519
C语言程序课后答案1.voidfun(intx)
{
if(x>0)
printf("%-4d",x);
else
printf("%-2d",0);
}
#include<conio.h>
main()
{
inta[6],i;
clrscr();
for(i=0;i<6;i++)
scanf("%d\n",&a[i]);
for(i=0;i<6;i++)
fun(a[i])}2．#include<stdio.h>
#include<math.h>
#include<conio.h>
main()
{
floatsum=0.0,a,b,x1=0.0,y1=0.0,xx=0.0;
floatx[12],y[12],ma,na,mb,nb;
inti;
clrscr();
x[0]=0;y[0]=0;
x[1]=5;y[1]=0.000127;
x[2]=10,y[2]=0.000216;
x[3]=15;y[3]=0.000286;
x[4]=20;y[4]=0.000344;
x[5]=25;y[5]=0.000387;
x[6]=30;y[6]=0.000415;
x[7]=35;y[7]=0.000437;
x[8]=40;y[8]=0.000451;
x[9]=45;y[9]=0.000458;
x[10]=50;y[10]=0.000462;
x[11]=55;y[11]=0.000464;
for(i=0;i<12;i++)
{sum+=x[i]*y[i];
x1+=x[i];
y1+=y[i];
xx+=x[i]*x[i];
}
printf("sum=%e,x1=%f,y1=%e,xx=%f\n",sum,x1,y1,xx);
ma=(sum*12-y1*x1);na=(xx*12-x1*x1);
printf("ma=%f,na=%f\n",ma,na);
a=ma/na;
mb=(xx*y1-x1*sum);nb=(xx*12-x1*x1);
printf("mb=%f,nb=%f\n",mb,nb);
b=mb/nb;
printf("a=%e,b=%e\n",a,b);
}3。#include<stdio.h>
#include<math.h>
#include<conio.h>
main()
{
inti,j,b=0;
clrscr();
for(i=0;i<3;i++)
for(j=0;j<2;j++)
if(i>=j)
b++;
printf("b=%d\n",b);
}4。#include<stdio.h>
#include<math.h>
#include<conio.h>
main()
{
intj,x,max,min,sum;
floataver;
clrscr();
printf("pleaseinput10numbers:\n");
scanf("%d",&x);
sum=max=min=x;
for(j=2;j<=10;j++)
{
scanf("%d",&x);
sum+=x;
if(max<x)
max=x;
elseif(min>x)
min=x;
}
sum=sum-max-min;
aver=sum/8.0;
printf("Theaverageis:%6.2f\n",aver);
}
5．#include<stdio.h>
#include<math.h>
#include<conio.h>
main()
{
inti,sum=0;
clrscr();
for(i=1;i<=100;i++)
if(i%7==0)
sum+=i;
printf("sum=%d\n",sum);
}6。#include<stdio.h>
#include<math.h>
#include<conio.h>
main()
{longn=1;
floatterm=1.0,pi,sum=0.0;
clrscr();
term=1.0/(n*n);
while(term>=1e-12)
{

term=1.0/(n*n);
sum+=term;
n++;
}
pi=sqrt(sum*6);
printf("pi=%f\n",pi);
}7。#include<stdio.h>
#include<math.h>
#include<conio.h>
main()
{
intn=0;
charch;
ch=getchar();
while(ch>32)
{
n++;
ch=getchar();
}
printf("n=%d\n",n);}8．#include<stdio.h>
#include<math.h>
#include<conio.h>
main()
{