C语言测试题一参考答案.doc

6.#includeint main()char ch; ch=getchar();if (ch=65)&(ch=90)ch=ch+32; printf(%c的十进制的ASCII码值=%dn,ch,ch);return 0;7.#includeint main()const double PI = 3.14159;double r;double area,cir;printf(请输入圆的半径:);scanf(%lf,&r) ;area = PI*r*r ;cir = 2*PI*r;printf(圆的面积为：%.2lfn,area);printf(圆的周长为： %.2lfn,cir);return 0;8.#includeint main()int n,s;s=0;printf(请输入一个正整数:);scanf(%d,&n);for(int i=1;i=n;i+)s=s+i; printf(用for语句计算,1+2+3+%d=%dn,n,s);return 0;#includeint main()int i,n,s;s=0;i=1;printf(请输入一个正整数:);scanf(%d,&n);while (i=n)s=s+i; i+;printf(用while语句计算,1+2+3+%d=%dn,n,s);return 0;#includeint main() int i,n,s;s=0;i=1;printf(请输入一个正整数:);scanf(%d,&n);do s=s+i; i+;while(i=n); printf(用do-while语句计算,1+2+3+%d=%dn,n,s);return 0;9.#includeint main()int i,s;s=1;printf(请输入一个正整数:);scanf(%d,&i);while (i0)s=s*(i % 10); i=i/10;printf(该整数各数字之积=%dn,s);return 0;10#include #define PI 3.14int main() float a,b,r; int ch; do printf(-n); printf(| 简易计算器 |n); printf(|-|n); printf(| 1、加法 |n); printf(| 2、减法 |n); printf(| 3、乘法 |n); printf(| 4、除法 |n); printf(| 5、求模 |n); printf(| 0、退出 |n); printf(-n); /*选择运算类型,并检查输入是否合法*/ while(1) printf(请选择运算类型（0-5）：); scanf(%d,&ch); fflush(stdin); if(ch=0) exit(0); /*输入0时，立即退出程序*/ if(ch0&ch=5)/*输入合法时，跳出死循环*/ break; /*输入进行运算的数据，并检查输入的数据是否合法*/ printf(请输入两个操作数：n); while(scanf(%f%f,&a,&b)!=2) fflush(stdin); /*输入不合法，刷新缓冲区，重新输入数据*/ printf(输入的不是两个数字，请重新输入！n); /*根据操作符，选择运算方式。再对数据进行运算*/ switch(ch) case 1: r=a+b; break; case 2: r=a-b; break; case 3: r=a*b; break; case 4: r=a/b; break; case 5: r=(int)a%(int)b; break; /*若是求模运算，结果为整数*/ if(ch=5) printf(%dn,(int)r); else printf(%.2fn,r); while(1);11.#includeint main() int a,b,temp; scanf(%d%d,&a,&b); temp=a; a=b; b=temp; printf(%d,%dn,a,b); return 0;12.#includeint main() int x; scanf(%d,&x); if(x%2) printf(%dn,x); else printf(%dn,-x); return 0;13.#includeint main() int x; scanf(%d,&x); switch(x) case 1:printf(Monday);break; case 2:printf(Tuesday);break; case 3:printf(Wednesday);break; case 4:printf(Thursday);break; case 5:printf(Friday);break; case 6:printf(Saturday);break; case 7:printf(Sunday);break; default:printf(Input Error!n); return 0;14.#includeint main() int x,i=0; scanf(%d,&x); while(x!=0) if(x0&x=100) i+; scanf(%d,&x); printf(%dn,i); return 0;15.#includeint main() int a,n,i=1,b=0,s=0; scanf(%d%d,&a,&n); while(i=n) b=b*10+a; s=s+b; i+; printf(%dn,s); return 0;16.#includevoidmain()inta,b,c,x,y;for(a=1;a=9;a+)for(b=0;b=9;b+)for(c=1;c=9;c+)x=100*a+10*b+c;y=100*c+10*b+a;if(x+y=1333)printf(x=%d,y=%d,x,y);17.#includevoidmain()inta10;inti=0,nCount=0;doscanf(%d,&ai);i+;while(i10);i=0;doif(ai%3=0&ai%7=0)nCount+;i+;while(i10);printf(%d,nCount);18.#include void main() int n,t=1,f=-1; int sum=0; for(n=1;n=10;n+) t=t*n;f=-f; sum=sum+t*f; printf(%d,sum); 19.#include void main() charday;scanf(%c,&day);swith(day)case1:printf(mondayn);break;case2:printf(tuesdayn);break;case3:printf(wednsdayn);break;case4:printf(thursdayn);braek;case5:printf(fridayn);break;case6:printf(saturdayn);break;case7:printf(sundayn);break;defult:printf(errorn);20.#include void main()int day,month,year,sum,leap;printf(nplease input year,month,dayn);scanf(%d,%d,%d,&year,&month,&day);sum=0;switch(month)case 12:sum=sum+30; break;case 11:sum=sum+31; break;case 10:sum=sum+30; break;case 9:sum=sum+31; break;case 8:sum=sum+30; break;case 7:sum=sum+31; break;case 6:sum=sum+30; break;case 5:sum=sum+31; break;case 4:sum=sum+30; break;case 3:sum=sum+28; break;case 2:sum=sum+31; break;case 1:sum=sum+day;break;default:printf(data error);break;sum=sum+day; if(year%400=0|(year%4=0&year%100!=0)leap=1;elseleap=0;if(leap=1&month=2)sum+;printf(it is the %dth day.,sum)21.#include #include main()int x;double y;scanf(%d, &x); /* 输入一个整数*/if (x 0) y = exp(-x); /*如果大于0，计算y=exp(-x)的值 */else if (x = 0) y = 1; /*x=0，则y=1*/else y = -exp(x); /*x0，则y=-exp(x)*/printf(y=%fn, y);22.#include main()char c;printf(*Time*n);printf(1 morning n);printf(2 afternoon n);printf(3 night n);printf(please enter your choice);/*建立相应的菜单 */c = getchar();/*输入选项*/switch (c)/*通过switch选择 */case 1:printf(Good morning n);break;case 2: printf(Good afternoon n);break;case 3: printf(Good nightn);break;default: printf(Selection error!n);23.#include main()int i, sum = 0;for (i = 1; i = 101; i = i+2)sum = sum + i;printf(sum=%dn, sum);24.#include main()int i, j, k, n;printf(result is:);for (n = 100; n 1000; n+)i = n / 100;/*分出百位*/j = (n - i * 100) / 10;/*分出十位*/k = n % 10;/*分出个位*/ if (i*100 + j*10 + k = i*i*i + j*j*j + k*k*k)printf(%dt ,n);/*输出结果*/printf(n);25.#include main()int x, y;for (x = 1; x = 97; x+)y = 98 - x;if (2 * x + 4 * y = 386)printf(x = %d, y = %d, x, y);26.#includemain() int a,b,c,t; printf(请输入三个正整数：); scanf(%d,%d,%d,&a,&b,&c); if(ab) t=a; a=b; b=t; if(ac) t=a; a=c; c=t; if(bc) t=b; b=c; c=t; printf(nn从小到大顺序为:%d,%d,%dn,a,b,c);27.#includemain() int i,n,sum; printf(请输入正整数n：); scanf(%d,&n); if(n1)printf(输入错误n); else sum=0; for(i=1;i=n;i+) sum+=2*i-1; printf(nn前%d个奇数累加和为:%dn,n,sum); 28.#include #include main() int i,j,k,l,s=0; printf(n下面是100以内的所有素数:n); k=0; for(i=2;i=100;i+) s=1; l=sqrt(i); for(j=2;j=l;j+) if(i%j=0) s=0; break; if(s=1) printf( %d,i); k+; printf(nn1-100间共有%d个素数n,k);29.#includemain() int x,y,z,k;/*分别代表所买的公鸡数，母鸡数，小鸡数*/ k=0; for(x=1;x99;x+) for(y=1;y99;y+) for(z=1;z99;z+) if(x*5+y*3+z/3=100)&(z%3=0)&(x+y+z=100) k+; printf(n百钱百鸡第%d种答案为:公鸡数为%d只，母鸡数为%d只，小鸡数为%d只。n,k,x,y,z); 30.#includemain() int i,students,score; char grade; printf(输入学生总数:); scanf(%d,&students); for(i=1;i=students;i+) printf(n输入第%d名学生分数:,i); scanf(%d,&score); if(score100) printf(分数有错误!n); continue; switch(score/10) case 10: case 9: grade=A; break; case 8: grade=B; break; case 7: grade=C; break; case 6: grade=D; break; default:grade=E; printf(对应五分制等级为 %cn,grade); 31.#includeint main()inta,b,c,t;printf(“Inputthreeintegers:”);scanf(“%d,%d,%d”,&a,&b,&c);if(ab)t=a;a=b;b=t; if(ac)t=a;a=c;c=t; if(bc)t=b;b=c;c=t