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1、2.2 #includemain()float x=2.5,y=2.5,z=2.5;printf(x=%fn,x);printf(y=%fn,y);printf(z=%fn,z);3.1(1) #includemain()int a=12,b=3;float x=18.5,y=4.6;printf(%fn,(float)(a*b)/2);printf(%dn,(int)x%(int)y);3.1(2)#includemain()int x=32,y=81,p,q;p=x+;q=-y;printf(%d %dn,p,q);printf(%d %dn,x,y);3.2 #includemain()
2、int x,b0,b1,b2,s;printf(Inputx:);scanf(%d,&x);b2=x/100;b1=(x-b2*100)/10;/或(x%100)/10;或x/10%10;b0=x%10;s=b0*100+b1*10+b2;printf(s=%dn,s);3.3 #include#includemain()float rate=0.0225;float n,capital,deposit;printf(Input n,capital:);scanf(%f,%f,&n,&capital);deposit=capital*pow(1+rate,n);printf(deposit=%
3、fn,deposit);3.4 #include#includemain()float a, b, c;double x, y;printf(Input a, b, c:);scanf(%f %f %f, &a, &b, &c);x=(-b+sqrt(b*b-4*a*c)/(2*a);y=(-b-sqrt(b*b-4*a*c)/(2*a);printf(x=%f,y=%fn,x,y);习题44.1(1) #includemain()char c1=a,c2=b,c3=c;printf(a%cb%cc%cn,c1,c2,c3);4.1(2) #includemain()int a=12,b=15
4、;printf(a=%d%,b=%d%n,a,b);4.1(3) #includemain()int a,b;scanf(%2d%*2s%2d,&a,&b);printf(%d,%dn,a,b);4.2 #includemain()long a,b;float x,y;scanf(%d,%dn,&a,&b);scanf(%f,%fn,&x,&y);printf(a=%d,b=%dn,a,b);printf(x=%f,b=%fn,x,y);5.1 #includemain()float a;printf(Input a:);scanf(%f,&a);if(a=0)a=a;printf(a=%fn
5、,a);elsea=-a;printf(a=%fn,a);5.2 #includemain()int a;printf(Input a:);scanf(%d, &a);if(a%2=0)printf(a 是偶数);elseprintf(a 是奇数);5.3 #include#includemain()float a,b,c,s,area;printf(Input a, b, c:);scanf(%f %f %f, &a, &b, &c);if(a+bc&a+cb&b+ca)s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c);printf(area=
6、%fn,area);elseprintf(不是三角形);5.4 #include#includemain()float a,b,c,x,y;printf(Inputa,b,c:);scanf(%f,%f,%f,&a,&b,&c);if(a=0)printf(该方程不是一元二次方程n);if(b*b-4*a*c0)x=(-b+sqrt(b*b-4*a*c)/(2*a);y=(-b-sqrt(b*b-4*a*c)/(2*a);printf(x=%f,y=%fn,x,y);else if(b*b-4*a*c=0)x=-b/(2*a);y=-b/(2*a);printf(x=%f,y=%fn,x,y)
7、;elseprintf(该方程无实根n);5.5 #includemain()int year,flag;printf(Input a year:);scanf(%d,&year);if(year%4=0&year%400!=0|year%400=0)flag=1;elseflag=0;if(flag=1)printf(%d is a leap year !n,year);elseprintf(%d is not a leap year !n,year);5.6 #includemain()int year,flag;printf(Input a year:);scanf(%d,&year);
8、flag=year%400=0|year%4=0&year%100!=0?1:0;if(flag=1&flag!=0)printf(%d is a leap year !n,year);elseprintf(%d is not a leap year !n,year);5.7 #includemain()char ch;printf(Inputch:);scanf(%c,&ch);if(ch=a&ch=A&ch=Z)ch=getchar();ch=ch+32;printf(%c,%dn,ch,ch);elseprintf(%c,ch);15.8 #includemain()char ch;pr
9、intf(Inputch:);scanf(%c,&ch);if(ch=48&ch=65&ch=97&ch=122)printf(ch 是小写字母n);else if(ch=32)printf(ch 是空格n);elseprintf(ch 是其他字符n);5.9 #includemain()int score,grade;printf(Input score:);scanf(%d,&score);grade=score/10;if(score100)printf(Input errorn);if(score=90&score=80&score=70&score=60&score=0&score6
10、0)printf(%d- -En,score);5.10 #includemain()int year,month;printf(Input year,month:);scanf(%d,%d,&year,&month);if(month12|month=0)printf(error monthn);elseswitch(year,month)case 12:case 10:case 8:case 7:case 5:case 3:case 1:printf(31 天n);break;case 11:case 9:case 6:case 4:printf(30 天n);break;case 2:if(year%4=0&year!=0|year%400=0)printf(29 天n);elseprintf(28 天n);break;default:printf(Input errorn);6.1(1) #includemain()int i,j,k;char space= ;for(i=1;i=4;i+)for(j=1;j=i;j+)printf(%c,space);for(k=1;k=6;k+)printf(*);printf(n);6.1(2) #includemain()int k=4,n;for(n=0;nk;n+)if(n%2=
