C语言程序设计苏小红版答案.docx
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C语言程序设计苏小红版答案.docx
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C语言程序设计苏小红版答案
2・2#include
main()
{
floatx=2・5,y二2・5,z=2・5;
printf("x=%f\n",x);
printf(z,y=%f\n,,>y);
printf("z=%f\n",z);
}
3.1
(1)#include
main()
{
inta二12,b二3;
floatx=18・5,y二4.6;
printf("%d\n",(float)(a*b)/2);
printf(”%d\n",(int)x%(int)y);
}
3・2#include〈stdio.h>
main()
{
intx,bO,bl,b2,s;
printf(/zInputx:
〃);
scanf&x);
b2=x/100;
bl=(x-b2*100)/10;
b0=x%10;
s=b0*100+bl*10+b2;
printf("s=%d\n",s);
}
3.3ftinclude
ftinclude
main()
{
floatrate=0.0225;
floatn,capital,deposit;
printf(“Inputn,capital:
z,):
scanf("%f,%f",&n,&capital);
deposit二capital*pow(1+rate,n);
printf(〃deposit=%f\n",deposit);
}
3・4#include
ftinclude
main()
floata,b,c;
doublex,y;
printf("Inputa,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);printfy=%f\n,z,x,y);
}
4.1
(1)#include
main()
{
charcl二'a',c2二'b',c3二'c';
printf("a%cb%cc%c\n",cl,c2,c3);
}
4.1
(2)#include
main()
{
inta=12,b=15;
printf(,,a=%d%%,b=%d%%\n,z,a,b);
}
main()
inta,b;
scanf(〃%2d%*2s%2d〃,&a,&b);printf("%d,%d\n",a,b);
}
4・2#include
main()
{
longa,b;
floatx,y;
scanf("%d,%d\n",&a,&b);
scanf(〃%f,%f\n",&x,&y);
printf("a=%d,b二%d\n",a,b);printfb=%f\n,z,x,y);
}
5・1#include
main()
{
floata;
printf("Irmputa:
〃);
scanf("%f",&a);
if(a>=0)
a二a;
printf\n〃,a);
}
else
printfCa=%f\n\a);
}
}
5・2#include
main()
{
inta;
printf(/zInputa:
;
scanf&a);
if(a%2==0)
{
printffa是偶数“);
}
else
printf(〃a是奇数〃);
}
5・3#include
#include
{
floata,b,c,s,area;
printf("Inputa,b,c:
");
scanf(”%f,%f,",&a,&b,&c);
if(a+b>c&&a+c>b&&b+c>a)
{
s二(a+b+c)/2;
area=(float)sqrt(s*(s~a)*(s-b)*(s~c));printf(z,area=%f\n/z,area);
}
else
printfC不是三角形〃);
}
}
5・4#include
main()
{
floata,b,c,x,y;
printf("Inputa,b,c:
");
scanf(“%f,%f,%f",&a,&b,&c);
if(a==0)
{
printfC该方程不是一元二次方程\『);
}
if(b*b-4*a*c>0)
{
x=(-b+sqrt(b*b-4*a*c))/(2*a);
y=(-b-sqrt(b*b-4*a*c))/(2*a);
printf("x=%f,y=%f\n,?
x,y);
}
elseif(b*b-4*a*c二二0)
{
x=-b/(2*a);
y=-b/(2*a);
printf("x=%f,y=%f\n,,»x,y);
else
printfC该方程无实根\n〃);
}
5.5#include
main()
{
intyear,flag;
printf("Inputayear:
");
scanf&year);
if(year%4==0&&year%400!
=0|year%400==0)
{
flag=l;
}
else
{
flag=O;
}
if(flag==l)
{
printf("%disaleapyear!
\n",year);
else
printf(z,%disnotaleapyear!
\n\year):
}
}
5・6#include
main()
{
intyear,flag;
printf("Inputayear:
");
scanf&year);
flag=year%400~0丨year%4==0&&year%100!
=0?
l:
0;
if(flag==l&&flag!
=O)
{
printf(z,%disaleapyear!
\n,z,year);
}
else
{
printf(z,%disnotaleapyear!
\nz,,year):
}
5・7nclude〈stdio.h>
main()
{
charch;
printf("Inputch:
“);
scanf&ch);
if(ch>二'a&&ch〈二'z')
{
ch二getchar();
ch二ch-32;
printf("%c,%d\n",ch,ch);
}
elseif(ch>二'A'&&ch<='Z')
{
ch二getchar();
ch二ch+32;
printf("%c,%d\n",ch,ch);
}
else
{
printfch);
5.8#include〈stdio.h>main()
{
charch;
printf("Inputch:
“);
scanf&ch);
if(ch>=48&&ch<=57)
{
printf("ch是数字字符\n");
}
elseif(ch>=65&&ch<=90)
{
printf(,zch是大写字母\n");
}
elseif(ch>=97&&ch<=122)
{
printf(〃ch是小写字母\n〃);
}
elseif(ch==32)
printf("ch是空格\rT);
else
printf("ch是其他字符\rT);
}
}
5・9#include
main()
{
intscore,grade;
printf("Inputscore:
");
scanf(“%d",&score);
grade二score,10;
if(score<0Iscore>100)
{
printf("Inputerror\n,z):
}
if(score>=90&&score〈二100)
{
printf("%d-一A\n,z,score);
elseif(score>=80&&score<90)
printf("%d-一B\n",score);
}
elseif(score〉二70&&score<80)
{
printf(”%d—C\n",score);
}
elseif(score>=60&&score<70)
{
printf("%d--D\n",score);
}
elseif(score〉二0&&score<60)
{
printf(“%d--E\n",score);
}
}
5・10#include〈stdio.h>
main()
{
intyear,month;
printf("Inputyear,month:
,z);
scanf%d,z,&year,&month);
辻(month>12month<=0)
printf(z,errormonth'n");
else
{
switch(year,month)
{
case12:
case10:
case8:
case7:
case5:
case3:
case1:
printf("31天\n”);
break;
case11:
case9:
case6:
case4:
break;
case2:
辻(year%4==0&&year!
=0year%400==0)
{
printf("29天\n〃);
}
else
{
printf("28天\n");
}
break;
defauIt:
printf("Inputerror\n,/);
}
}
}
6.1
(1)ttinclude
main()
{
inti,j,k;
charspace二'';
for(i=l;i<=4;i++)
printf(“%c",space);
}
for(k=l;k<=6;k卄)
{
printf("*");
}
printf("\n");
}
}
6.1
(2)#include
main()
intk=4,n;
for(n=0;n { if(n%2==0)continue; 6.1(3)#include { intk=4,n; for(n二0;n〈k;n++) { if(n%2二二0)break; } printfn二%d\n",k,n); } 6.2 (1)#include
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