C语言程序常考题.docx

1、1将成绩分为A，B，C等的程序#includevoid main()int score;char grade;printf(Please input a score:n);scanf(%d,&score);grade=score=90?A:(score=60?B:C);printf(%d belongs to %cn,score,grade);2判断是数字，字母，还是其他字符#includevoid main()char c;printf(Please input a character:);c=getchar();if(c=A&c=a&c=0&c=9)printf(%c is digitn,

2、c);else printf(%c is other charactern,c);3三角形面积#include#includevoid main()float a,b,c,s,area;scanf(%f,%f,%f,&a,&b,&c);s=(a+b+c)/2.0;area=sqrt(s*(s-a)*(s-b)*(s-c);printf(a=%7.2f,b=%7.2f,c=%7.2fn,a,b,c);printf(area=%7.2f,s=%7.2fn,area,s);4输入数字，即可得到相应星期单词#includevoid main()int x;printf(Input integer nu

3、mber:);scanf(%d,&x);switch(x)case 1:printf(Mondayn);break;case 2:printf(Tuesdayn);break;case 3:printf(Wednesdayn);break;case 4:printf(Thursday);break;case 5:printf(Fridayn);break;case 6:printf(Saturdayn);break;case 7:printf(Sundayn);break;default: printf(errorn);5圆的周长，面积，球的体积，表面积，圆柱体积#include#define

4、 PI 3.1415926void main()float r,h,l,s,sq,vq,vz;printf(请输入圆半径r,圆柱高h:n);scanf(%f,%f,&r,&h);l=2*PI*r;s=PI*r*r;sq=4*PI*r*r;vq=4.0/3.0*PI*r*r*r;vz=PI*r*r*h;printf(圆周长： l=%6.2fn,l);printf(圆面积： s=%6.2fn,s);printf(圆球表面积：sq=%6.2fn,sq);printf(圆球体积： sv=%6.2fn,vq);printf(圆柱体积： sz=%6.2fn,vz);6某分段函数，输入X求解Y的值#incl

5、udevoid main()float x,y;printf(Please input x:);scanf(&f,&x);if(x-1)y=1;elseif(x=1)y=2*x-5;elsey=5*x*x-1;printf(y=%10fn,y);7比较输入的两个数，并输出较大值#includevoid main() float x,y,max;printf(Please input two number x,y:);scanf(%f,%f,&x,&y);if(xy) max=x;else max=y;printf(max=%7.2f,max);例5.10求两个整数的最大公约数和最小公倍数。#i

6、ncludevoidmain()intm,n,p,t,r;scanf(“%d,%d”,&m,&n);if(nm)t=n;n=m;m=t;p=m*n;while(m!=0)r=n%m;n=m;m=r;printf(“m和n的最大公约数：%dn”,n)；printf(“m和n的最小公倍数：%dn”,p/n)；课后2、计算1-10之间的奇数和偶数之和并分别输出。#includevoidmain()inta,b,c,i;a=c=0;for(i=0;i=10;i+=2;)a+=I;b=i+1;c+=b;printf(“偶数之和=%dn”,a);printf(“奇数之和=%dn”,c-11);3、求100

7、-200间的全部素数并输出，输出十个数后换行。#include#includevoidmain()intm,flag,i,n;for(m=101;m200;m=m+2;)flag=1;for(i=2;isqrt(m);i+)if(m%i=0)flag=0;break;if(flag=1)printf(“%d”,m);N=n+1If(n%10=0)printf(“n”);4、输出100以内能被3整除且个位数为6的所有整数。#includevoidmain()inti,j;for(i=0;i=9;i+)j=i*10+6;if(j%3!=0)continue;printf(“%d”,j);print

8、f(“%n”);例6.4应用冒泡排序法将数组中的五个数据按升序排列。#includevoidmain()inti,j,t,a5；printf（“pleaseinputthearray:”）;for(i=0;i5;i+)scanf(“%d”,&ai);for(i=0;i4;i+)for(j=0;jaj+1)t=aj;aj=aj+1;aj+1=t;printf(“theresultis:”);for(i=0；i5;i+)printf(“%d”,ai);printf(“n”)例6.7将3*4的二维数组中的第0列和最后一列的元素的数值交换，第一列和第二列元素的值相交换。#includevoidmain

9、()inta34=5,8,9,1,4,2,6,7,12,13,14,10,i,j,k;for(i=0;i3;i+)for(j=0;j4/2;j+)k=aij;aij=ai3-j;ai3-j=k;for(i=0;i3;i+)printf(“n”);for(j=0;j4;j+)printf(“%4d”,aij);printf(“n”);例6.8求3*3矩阵主对角线和次对角线上各元素之和。#includevoidmain()inta33=1,2,3,4,5,6,7,8,9,I,j,sum=0;for(i=0;i3;i+)sum+=aij;for(i=0;i=0;j-)if(i+j=2)sum+=ai

10、j;sum=sum-a3/23/2;printf(“sum=%dn”,sum); 请编写函数fun，其功能是 求2+4+6+8+20 的和#includevoid NONO();int fun()int sum=0;for(int i=2;i21;i+)sum+=i;i+;return sum;void main()printf(%dn,fun();NONO();void NONO()FILE *wf;wf=fopen(j5.out,w);fprintf(wf,%dn,fun();fclose(wf);用指向二维数组元素的指针变量，找出二维数组中值最大的元素，并指出。#includevoid

11、main()int a34=1,2,3,4,5,6,7,8,9,10,11,12;int *p;int max;max=a00;for(p=&a00;pmax) max=*p;printf(max=%dn,max);用字符型指针变量输出字符数组中的字符串#includevoid main()char s=HELLO!;char *p;p=s;while(*p!=0)printf(%c,*p);p+；printf(n);定义一个求字符串长度的函数，输出由键盘输入的字符串的长度。#include#includeint mystrlen(char *s)int len=0;while(*s+)len

12、+;return len;void main()int k;char a80;gets(a);k=mystrlen(a);printf(%dn,k);把“FORTRAN”、“BASIC”、“C+”、“VB”、“C”五个字符串，用指针数组存放它们的首地址，并用指向指针的指针变量把它们输出。#includevoid main()int i;char *c5=FORTRAN,BASIC,C+,VB,C;char *p;p=c;for(i=0;i5;i+)printf(%sn,*p);p+;调用max函数返回数组各元素中值最大的元素地址。#includeint *max(int b,int n)int

13、 i,*q=b;for(i=1;in;i+)if(*qbi) q=b+i;return q;void main()int *p,a10=-7,5,19,13,14,38,-2,11,10,-6;p=max(a,10);printf(max:%dn,*p);用指针变量指向一维数组中的最大值，并输出最大值。#includevoid main()int a8=-2,8,9,12,15,17,25,-8;int i,*p;p=a;for(i=1;i8;i+)if(*pai) p=&ai;printf(%dn,*p);例4.9编写程序，判断某一年是否是闰年#includevoid main( )int

14、year ,flag;printf(“Please input year:”);scanf(“%d”,&year);if(year%4=0)if(year%100= =0)if(year%400= =0)flag=1;elseflag=0;elseflag=1;elseflag=0;if(flag)printf(“%d is a leap yearn”,year);elseprintf(“%d is not a leap yearn”,year);2.输出一个字符，判别它是否是大写字母，如果是大写字母，将其转换为小写字母，否则就不转换，最后输出#includevoid main( )char

15、ch;scanf（“%c”,&ch）;ch=(ch=A&ch=Z?(ch+32):ch);printf(“%c”,ch);3.有一个函数：y=x (x1)2x-1 (1=x=10)根据该分段函数写程序，输入一个x，输出对应y的值#includevoid main( )float x,y;printf(“Please input x:”);scanf(“%f”,&x);if(x1)y=x;else if(x10)y=2*x-1;elsey=3*x-11;printf(“y=%10fn”,y);例5.4 任意输入10个整数，找出其中最大值并输出#includevoid main( )int a,m

16、ax;int i;scanf(“%d”,&a);max=a;for(i=1;imax) max=a;printf(“max=%dn”,max);例5.5输入一个大于3的整数给m,判断m是否为素数#include#includevoid main( )int m,i,flag;printf(“请输入要判断的正整数m; ”);scanf(“%d”,&m);flag=1;for(i=2;i=sqrt(m);i+)if(m%i=0)flag=0;break;if(flag=1)printf(“%d是素数n”,m);elseprintf(“%d不是素数n”,m);例5.6 将300400之间既能被3整除，又能被5整除的数输出，要求