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1、2. 2#includemain()Ifloatx=2.5,y=2.5,z=2.5;printf(x=%fn,x);printf(y=%fn,y);printf(z=%fn,z);)3. 1(1)#includemain()Iinta=12,b=3;floatx=18.5,y=4.6；printf(%dn,(float)(a*b)2);printf(%dn”,(int)x%(int)y)；)3. 2#includemain()Iintx,b,b1,b2,s；printf(,Inputx:)；scanf(%d,x);b2=x100;b1=(-b2*100)10;b0=x%10;s=b0*100+
2、b1*10+b2;printf(s=dn,s);)3. 3#include#incIudemain()Ifloatrate=0.0225；floatn,capital,deposit;printf(Inputn,capitaI：);scanf(%f,%f,&n,&capital);deposit=capitaI*pow(1+rate,n)；printf(deposit=%fn,deposit)；J3. 4include#incIudemain()floata,b,c；doubIex,y;printf(Inputa,b,c：;scanf(%f,%f,%f,&a,&b,&c);x=(-b+sqrt
3、(b*b-4*a*c)/(2*a);y=(-b-sqrt(b*b-4*a*c)/(2*a);printf(x=%f,y=%fn,y);14. 1(1)#includemain()(chard=,a,c2=,b,c3=c;printf(,a%cb%cc%cn,d,c2,c3);)4.1 (2)#includemain()(inta=12,b=15;printf(,a=%d%,b=%d%n,a,b);)4.2 (3)#includemain()(inta,b；scanf(%2d%*2s%2d,&a,&b);printf(%d,%dn,a,b);)4.3 #includemain()(longa,b
4、;floatx,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);J5. 1#includemain()(floata；printf(Innputa:,);scanf;if(a=0)a=a;printf(a=%fn,a)；)else(a=-a;printf(a=%fn,a)；)5. 2#includemain()Iinta；printf(Inputa:)；scanf(%d,a);if(a%2=0)(Printf(a是偶数)；)else(printf(a是奇数)；)5. 3
5、#include#incIudemain()Ifloata,b,c,s,area；printf(Inputa,b,c：);scanf(n%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=%fn,area)；)else(Printf(不是三角形)；)5.4#include#incIudemain()floata,b,c,y；printf(,Inputa,b,c：;scanf(%f,%f,f,&a,&b,&c);if(a=0)(Printf(该方程不是
6、一元二次方程n);)if(b*b-4*a*cO)(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);)elseif(b*b-4*a*c=0)(=-b(2*a);y=-b(2*a);printf(=%f,y=%fn,x,y);)else(Printf(该方程无实根n);)5.5#includemain()(intyear,flag；printf(Inputayear：)；scanf(%d,&year)；if(year%4=0&year%400!=0year%400=0)(fag=1;)el
7、se(fag=0;)if(fIag=Dprintf(,%disaleapyear!n,year)；else(printf(%disnotaleapyear!n,year)；)5.6#includemain()Iintyear,flag；printf(Inputayear：)；scanf(,%d,&year)；fIag=year%400=0year%4=0&year%100!=0?1：0；if(f|ag=1&flag!=0)(printf(%disaleapyear!n,year);)else(printf(%disnotaleapyear!n,year)；)5.7#includemain()I
8、charch；printf(Inputch:);scanf(%c,&ch)；if(ch=,a,aach=,A,Sch=,Z)(ch=getchar()；ch=ch+32;printf(%c,%dn,ch,ch);)elseprintf(%c,ch)；5. 8#includemain()charch;printf(Inputch:,);scanf(%c,&ch);if(ch=48&ch=65&ch=97&ch=122)(Printf(ch是小写字母n);)elseif(ch=32)(printf(,ch是空格n);printf(ch是其他字符n);6. 9#includemain()(intsc
9、ore,grade；printf(Inputscore：);scanf(%d,&score);grade=score10;if(score100)Iprintf(Inputerrorn);if(score=90&score=80&score=70&score=60&score=0&score60)(printf(%dEn,score);)J7. 10#includemain()(intyear,month;printf(Inputyear,month：,)；scanf(%d,%d,&year,&month);if(month121month=0)(printf(errormonthn,);)e
10、Ise(switch(year,month)(case12：case10：case8：case7：case5：case3：case1：printf(31天n);break；case11：case9：case6：case4：printf(30天n);break；case2：if(year%4=0&year!=0year%4OO=O)(printf(,29天n);)else(printf(,28天n);)break；default：printf(,Inputerrorn);)1J8. 1(1)includemain()(inti,j,k；charspace=,;for(i=1；i=4;i+)(fo
11、r(j=1；j=i；j+)(printf(%c,space);)for(k=1；k=6；k+)(printf(*);)printf(,n)；)8.1 (2)#includemain()Iintk=4,n；for(n=0；nk；n+)(if(n%2=0)continue;k-；)printf(k=%dn,n=%dn,k,n);6. 1(3)#includemain()I1 ntk=4,n；for(n=0;nk;n+)(1 f(n%2=0)break；k一；)printf(k=%d,n=%dn,k,n);J6.2(1)#includemain()(inti,sum=0；for(i=1；i=101；i+)(sum=sum+i；)printf(sum=%dn,sum)；)6.2(2)#includemain()Ilongi;longterm,sum=0;for(i=1；i=101；i=i+2)Iterm=i*(i+1)*(i+2);sum=sum+term;)printf(sum=%ldn,sum);)6.2(4)#include
