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;else y=0;
C. y=-1 if(x) 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;
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若有定义: float w; int a, b; 则合法的switch语句是
A. switch(w){case1.0: printf("*\n"); case2.0: printf("**\n"); }
B. switch(a); { case 1 printf("*\n"); case 2 printf("**\n");}
C. switch(b) { case a: printf("*\n"); default: printf("\n"); case b: printf("**\n");}
D. switch(a+b){ case 1: printf("*\n"); case 2: printf("**\n"); default: printf("\n"); }
有如下程序#includevoid main(){int x=1,a=0,b=0;switch(x){case 0: b++;case 1: a++；case 2: a++;b++；}printf("a=%d,b=%d\n",a,b);}该程序的输出结果是
A. a=2,b=1
B. a=1,b=1
C. a=1,b=0
D. a=2,b=2
有如下程序#includevoid main(){float x=2.0,y;if(x < 0.0)y=0.0;else if(x < 10.0)y=1.0/x;elsey=1.0;printf("%f\n",y);}该程序的输出结果是
A. 0.000000
B. 0.250000
C. 0.500000
D. 1.000000
若a、 b、c1、c2、x、y、均是整型变量,正确的switch语句是
A. switch(a+b); {case 1:y=a+b;break; case 0:y=a-b;break; case 3:y=b-a,break;}
B. switch(a*a+b*b) {case 3: case 1:y=a+b;break; case 3:y=b-a,break;}
C. switch a {case c1:y=a-b;break; case c2:y=a*d;break; default:x=a+b; }
D. switch(a-b) {default:y=a*b;break; case 4:x=a+b;break; case 10:y=a-b;break; }
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