以下程序的输出结果是()。#include main(){int a,b,c =246;a=c/100%9;b=(-1)&&(-1);printf(" %d,%d\n",a,b);}

A. 2,1
B. 3,2
C. 4,3
D. 2, -1

设有说明语句"int a =1,b=0;"则执行以下语句后,输出结果为()。switch(a){ case 1:switch(b){case 0:printf(" * * 0 * * " );break;case 1:printf(" * * 1 * * " );break;}case 2:printf(" * * 2 * * " );break; }

A. * * 0 * *
B. * * 0 * * * * 2 * *
C. * * 0 * * * * 1 * * * * 2 * *
D. 有语法错误

与y=(x >0?1:x <0? -1:0);的功能相同的if语句是()。

A. if(x >0) y =1;else if(x<0) y = -1;else y =0;
B. if(x)if(x >0) y=1;else if(x <0) y = -1;
C. y = -1;if(x)if (x >0)y =1;else if(x ==0) y =0;else y = -1;
D. y =0;if(x >=0)if(x >0) y =1;else y = -1;

表示"整数x的绝对值大于5"时值为"真"的c语言表达式是____。

以下程序的输出结果是____。#include main( ){ int a =5,b =4,c=3,d;d= (a>b>c);printf(" %d \n",d);}

若运行时输入13,则以下程序的结果____。#include main( ){ int x,y;scanf(" %d ",&x);y =x >12? x +10:x -12;printf(" %d \n",y);}

6、输入AB下列程序的运行结果是____。#includemain(){int a,b;char c1,c2;printf("please input c1 and c2:\n");scanf("%c%c",&c1,&c2);printf("c1=%d,c2=%d\n",c1-1,c2-1);}

若int i=10;,则执行下列程序段后,变量i的正确结果是____。switch(i){ case 9: i+=1;case 10: i+=1;case 11: i+=1;default: i+=1;}

程序填空:下列程序实现的功能是输入某年某月某日,输出是这一年的第几天。#includevoid main(){int days;int data_year,data_month,data_day;printf("请输入日期(年,月,日):");scanf("%d, %d, %d", &data_year, &data_month, &data_day);switch(data_month){case 1:days = data_day;break;case 2:days = data_day+;break;case 3:days = data_day+59;break;case 4:days = data_day+90;break;case 5:days = data_day+;break;case 6:days = data_day+151;break;case 7:days = data_day+181;break;case 8:days = data_day+212;break;case 9:days = data_day+243;break;case 10:days = data_day+273;break;case 11:days = data_day+304;break;case 12:days = data_day+334;break;}if(data_year%4==0&&data_year%100!=0data_year%400==0)if(data_month>=3)days =;printf("%d月%d日是%d年的第%d天.\n", data_month, data_day, data_year, days);}