Question

求下列C语言题？

Answer 1

选择题第17题选择C

编程题：

1. #include<stdio.h>
   void main(){
   char str;
   printf("请输入一个字符：");
   scanf("%c",&str);
   if(((int)str>=65&&(int)str<=90)||((int)str>=97&&(int)str<=122)){
   printf("%c是一个字母!\n",str);
   }else{
   printf("%c不是一个字母!\n",str);
   }
   }

2. #include<stdio.h>
   void main(){
   int year;
   printf("请输入一个年份：");
   scanf("%d",&year);
   if((year%4==0&&year%100!=0)||year%400==0){
   printf("%d年是一个闰年!\n",year);
   }else{
   printf("%d年不是一个闰年!\n",year);
   }
   }

3. #include<stdio.h>
   void main(){
   int a,b,c;
   printf("请输入三角形三条边，并用,隔开：");
   scanf("%d,%d,%d",&a,&b,&c);
   while(a<=0||b<=0||c<=0){
   printf("你输入的三条边不正确!\n\n");
   printf("请输入三角形三条边，并用,隔开：");
   scanf("%d,%d,%d",&a,&b,&c);
   }
   if(a<b+c&&b<a+c&&c<a+b){
   printf("%d,%d,%d构成一个三角形!\n",a,b,c);
   }else{
   printf("%d,%d,%d不构成一个三角形!\n",a,b,c);
   }
   }

4. #include<stdio.h>
   void main(){
   char str;
   printf("请输入一个字符：");
   scanf("%c",&str);
   if((int)str>=48&&(int)str<=57){
   printf("%c是数字字符!\n",str);
   }else if((int)str>=65&&(int)str<=90){
   printf("%c是大写字母字符!\n",str);
   }else if((int)str>=97&&(int)str<=122){
   printf("%c是小写字母字符!\n",str);
   }else{
   printf("%c是其它特殊字符!\n",str);
   }
   }

5. #include<stdio.h>
   void main(){
   int month;
   char *monthArry[12]={"January","February","March","April","May","June","July","August","September","October","November","December"};
   printf("请输入月份(1-12之间)：");
   scanf("%d",&month);
   while(month>13||month<1){
   printf("你输入的月份不正确!\n\n");
   printf("请输入月份(1-12之间)：");
   scanf("%d",&month);
   }
   printf("%d月份对应的月份英文单词是：%s。\n",month,monthArry[month-1]);
   }