C语言测试题(一)参考答案[1]

#include <stdio.h>int main(){int a = 0;printf("请输入一个整型数字: ");scanf("%d", &a);if(a < 0){printf("负数\n");return +1;}else if(a > 0){printf("正数\n");return -1;}else if(0 == a){printf("零\n");return 0;}}2、#include <stdio.h>int main(){int a = 0, b = 0, c = 0;int t = 0;printf("请输入三个整型数：");scanf("%d %d %d", &a, &b ,&c);if(a > b){t = a;a = b;b = t;}if(a > c){t = a;a = c;c = t;}if(b > c){t = b;b = c;c = t;}printf("从小到大顺序是: %d, %d, %d\n\n", a, b, c);return 0;}3、#include <stdio.h>int main(){double a = 0, max = 0;int i = 0;printf("请输入第1个数:");scanf("%lf", &a);max=a;for(i = 1; i < 10; i++){printf("请输入第%d个数:", i+1);scanf("%lf", &a);if(max < a){max = a;}}printf("最大的数是: %f", max);return 0;}4、#include <stdio.h>int main(){int i = 0, j = 0, k = 0;for(i = 0; i < 7; i++){for(j = i+1; j < 7; j++){printf(" ");}for(k = 0; k < 2*i+1; k++){printf("*");}printf("\n");}return 0;}5、#include <stdio.h>int main(){int a = 0, i = 0;printf("请输入一个整型数：");scanf("%d", &a);for(i = 2; i <= (a/2 + 1); i++){if(a % i == 0){printf("%d不是一个素数！\n", a);return 0;}}printf("%d是一个素数！\n", a);return 0;}6.#include<stdio.h>int main(){char ch;ch=getchar();if ((ch>=65)&&(ch<=90))ch=ch+32;printf("%c的十进制的ASCII码值=%d\n",ch,ch);return 0;}7.#include<stdio.h>int 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：%.2lf\n",area);printf("圆的周长为：%.2lf\n",cir);return 0;}8.#include<stdio.h>int 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=%d\n",n,s);return 0;}#include<stdio.h>int 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=%d\n",n,s);return 0;}#include<stdio.h>int 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=%d\n",n,s);return 0;}9.#include<stdio.h>int main(){int i,s;s=1;printf("请输入一个正整数:");scanf("%d",&i);while (i>0){s=s*(i % 10);i=i/10;}printf("该整数各数字之积=%d\n",s);return 0;}10．#include <stdio.h>#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(ch>0&&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("%d\n",(int)r);elseprintf("%.2f\n",r);}while(1);}11.#include<stdio.h>int main(){int a,b,temp;scanf("%d%d",&a,&b);temp=a;a=b;b=temp;printf("%d,%d\n",a,b);return 0;}12.#include<stdio.h>int main(){int x;scanf("%d",&x);if(x%2){printf("%d\n",x);}else{printf("%d\n",-x);}return 0;}13.#include<stdio.h>int 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.#include<stdio.h>int main(){int x,i=0;scanf("%d",&x);while(x!=0){if(x>0&&x<=100){i++;}scanf("%d",&x);}printf("%d\n",i);return 0;}15.#include<stdio.h>int 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("%d\n",s);return 0;}16.#include <stdio.h>void main(){int a,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.#include <stdio.h>void main(){int a[10];int i=0,nCount=0;do{scanf("%d",&a[i]);i++;}while(i<10);i = 0 ;do{if(a[i]%3 == 0 && a[i] % 7 == 0)nCount++;i++;}while(i<10);printf("%d", nCount);}18.#include<stdio.h>void main(){int n,t=1;int sum=0;for(n=1;n<=10;n++){t=t*n;sum=sum+t;}printf("%d",sum);}19.#include<stdio.h>void main(){char day;scanf("%c",&day);swith(day){case '1':printf(" monday\n");break;case '2':printf("tuesday\n"); break;case '3':printf("wednsday\n"); break;case '4':printf("thursday\n"); braek;case '5':printf(" friday\n"); break;case '6':printf("saturday\n"); break;case '7':printf("sunday\n"); break;defult: printf("error\n");}}20.#include<stdio.h>void main(){int day,month,year,sum,leap;printf("\nplease input year,month,day\n"); scanf("%d,%d,%d",&year,&month,&day);sum=0;switch(month){case 12:sum=sum+30;case 11:sum=sum+31;case 10:sum=sum+30;case 9:sum=sum+31;case 8:sum=sum+30;case 7:sum=sum+31;case 6:sum=sum+30;case 5:sum=sum+31;case 4:sum=sum+30;case 3:sum=sum+28;case 2:sum=sum+31;case 1:sum=sum+day;default:printf("data error");break;}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 <stdio.h>#include <math.h>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); /*x<0，则y=-exp(x)*/` }printf("y=%f\n", y);}22.#include <stdio.h>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 night\n");break;default:printf("Selection error!\n");}}23.#include <stdio.h>main(){int i, sum = 0;for (i = 1; i <= 101; i = i+2){sum = sum + i;}printf("sum=%d\n", sum);}24.#include <stdio.h>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("%d\t ",n); /*输出结果*/}}printf("\n");}25.#include <stdio.h>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);}}}#include<stdio.h>main(){int a,b,c,t;printf("请输入三个正整数：");scanf("%d,%d,%d",&a,&b,&c);if(a>b){t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(b>c){t=b;b=c;c=t;}printf("\n\n从小到大顺序为:%d,%d,%d\n",a,b,c);}27.#include<stdio.h>main(){int i,n,sum;printf("请输入正整数n：");scanf("%d",&n);if(n<1)printf("输入错误\n");else{sum=0;for(i=1;i<=n;i++){sum+=2*i-1;}printf("\n\n前%d个奇数累加和为:%d\n",n,sum);}28.#include <stdio.h>#include <math.h>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("\n\n1-100间共有%d个素数\n",k);}29.#include<stdio.h>main(){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;x<99;x++)for(y=1;y<99;y++)for(z=1;z<99;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。