C语言课后编程题答案

13-3-1#include void main()int x,a,b,c;scanf(“%d“,a=x%10;b=x/10%10;c=x/100;x=a*100+b*10+c;printf(“%dn“,x);4-3-2#include void main()int a,b,c,d,t;scanf(“%d%d%d%d“,if(ab)t=a;a=b;b=t;if(ac)t=a;a=c;c=t;if(ad)t=a;a=d;d=t;if(bc)t=b;b=c;c=t;2if(bd)t=b;b=d;d=t;if(cd)t=c;c=d;d=t;printf(“%d,%d,%d,%dn“,a,b,c,d);4-3-3#include #include void main()double a,b,c,t,x1,x2;printf(“input a,b,c:n“);scanf(“%lf%lf%lf“,t=b*b-4*a*c;if(t0) x1=(-b+sqrt(t)/(2*a);x2=(-b-sqrt(t)/(2*a);printf(“x1=%.3f,x2=%.3fn“,x1,x2);if(t=0)x1=-b/(2*a);3printf(“x1=x2=%.3f/n“,x1);5-3-1#include void main()int i;double s,h;s=100;h=100;for(i=1;ivoid main() int i;4double f=1,s=0;for(i=1;ivoid main()int i,a,b,c;for(i=100;ivoid main() int i,n,f;for(i=1;ivoid main()long f1,f2,f3,i,m,n,y;6f1=1;f2=1;f3=1;scanf(“%d%d“,for(i=1;ivoid main()double a,b,t,sum=0;int i,s=1;a=1;b=2;for(i=1;i#includevoid main()double x,xn,fac,cosx;int n,s;fac=s=1;n=0;scanf(“%lf“,xn=cosx=1;dos=-s;n=n+2;fac=fac*n*(n-1);xn=xn*x*x;cosx=cosx+s*xn/fac;while(fabs(xn/fac)0.0001);printf(“%lf,%lfn“,cosx,cos(x);6-3-1#include 8double fun(double);void main()double x,y;scanf(“%lf“,y=fun(x);printf(“y=%lfn“,y);double fun(double x) double y;if(xint fun(int);9void main()int i,a;for(i=1;iint fun(int);void main()int m,n,p,q;scanf(“%d%d“,p=fun(n);q=fun(n-m+1);printf(“%dn“,