(考试复习)2011年c语言课后习题及补充例题

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1、例3.8测试是数字、空白还是其他字符的函数(假设测试的对象只限于以上几种字符)。voidtest_char(intc){switch(c){case'0':case'1':…case'9':printf("it'sadigit");break;case'':case'':case't':printf("it'sawhite");break;default:printf("it'sachar");break;}}intmain(void){charch；printf(“请输入字符”)；ch=getchar();test_char(ch);ret

2、urn0;}用switch语句改写例3.6#includeintmain(void){floatscore;printf("Inputascre:");scanf("%f",&score);switch((int)score){case8:printf("%fisA",score);break;case7:printf("%fisB",score);break;case6:printf("%fisC",score);break;default:printf("%fisD",score);break;}return0;}习题3.11由

3、键盘输入3个数，计算以这三个数为边长的三角形面积*/p33#include#includeintmain(void){doublea,b,c,s;printf(“输入三个实数:");scanf("%lf%lf%lf",&a,&b,&c);if((a+b)>c&&(a+c)>b&&(b+c>a)){s=(a+b+c)*0.5;printf("三角形面积：%lf",sqrt(s*(s-a)*(s-b)*(s-c)));}elseprintf("itisnottringle!");return0;}3.15习题:输出形状为

4、直角三角形的九九乘法表#includeintmain(void){inti,j,k;/*输出表头*/printf("*");for(i=1;i<10;i++)printf("%4d",i);printf("");/*输出表体*/for(j=1;j<10;j++)/*控制行输出*/{printf("%2d",j);for(k=1;k<=j;k++)/*控制列输出：列数=行数*/printf("%4d",j*k);printf("");}return0;}3.16习题:/*p111x3-16.c*/#includeintm

5、ain(void){doublee=1.0,y,x,detax;inti=1;printf("pleaeentererror:");scanf("%lf",&detax);/*输入用户希望的精度*/x=1.0;/*首项*/y=1/x;while(y>=detax){x=x*i;y=1/x;e=e+y;++i;}printf("%12.10lf",e);return0;}3.17习题:/*P111X3-17.C*/#includeintmain(void){inti,year,oxnum,oxnum1,oxnum2,oxnum3;printf

6、("Enteryear:");/*希望用户输入求第几年的牛的头数*/scanf("%d",&year);for(i=1;i<=year;i++){if(i<4){oxnum=oxnum1=oxnum2=oxnum3=1;}else{oxnum=oxnum1+oxnum3;oxnum3=oxnum2;oxnum2=oxnum1;oxnum1=oxnum;}printf("i=%2doxnumber=%3d",i,oxnum);}return0;}3.19习题:/*p111X3-19.C*/白马百担#includeintmain(void){int

7、x=0,y,z;while(x<=33){y=0;while(y<=50){z=100-x-y;if(3*x+2*y+z/2==100){printf("menis%d",men);printf("twomenis%d",women);printf("tchildrenis%d",children);}women++;}men++;}}//习题x5-5.c#includeintmain(void){floatmax,min,a[10],n,m;inti;for(i=0;i<10;i++)scanf("%f",&a[i]);max=m