C语言习题1-习题4答案

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1、习题1一、选择题1B2D3B4A5B6C7C二、填空题1..obj2.函数3./**/4.inta,ba,b习题2一、选择题1B2B3A4D5A6C7C8A9C10B11A12A13C14A15C二、填空题1．变量2．存储单元3．104．（1）a>=0(2)05．16．17．-308．389．位运算，没学10．位运算，没学11.9.912.7三、写出下列程序的运行结果1.0,0,52.183.6451284.55.位运算，没学四、编程题（供参考）1、#include#definePI3.14159voidmain()

2、{floatr,s;scanf("%f",&r);s=PI*r*r;printf("r=%.2f,s=%.2f",r,s);}2、#includevoidmain(){charc1,c2;scanf("%c",&c1);c2=c1+32;printf("%c",c2);}习题3一、选择题1C2C3A4C5B6B7D8C9A10B二、填空题1.-50300a=-50,b=300a=-50b=3002.10203010,20,30a=10,b=20,c=303.15、0、0三、写出下列程序的运行结果1.a=789

3、.654321,a=789.65,a=789.65432100,a=789.6543212.b=15,b=17,b=f3.c=1,x=0,y=0,z=14.2120,205.216,1806.a=A,b=d,c=F7.9,4,12,128.x=4.500000,y=4,x+y=8.500000四、编程题（供参考）1.#includevoidmain(){printf("************************HAPPYNEWYEAR!************************");}2.说明

4、：以下（1）和（2）只有红色的语句不相同，其它都一样。(1)#includevoidmain(){inta,b,c,max;a=5,b=8,c=10;if(a>b)max=a;elsemax=b;if(maxvoidmain(){inta,b,c,max;scanf("%d,%d,%d",&a,&b,&c);if(a>b)max=a;elsemax=b;if(max

5、n",max);}习题4一、选择题1D2D3C4ª5D6ª7C8C9D10B二、填空题1.6552．a%3==0

6、

7、a%7==03.(1)a>b(2)a=c(3)a,b,c三、写出下列程序的运行结果1.42.643.a=7,b=44.4646465.*#四、编程题1.（参照上一题的第3小题即可）#includevoidmain(){inta,b,c,s;scanf("%d,%d,%d",&a,&b,&c);if(a>b){s=a;a=b;b=s;}if(a>c){s=a;a=c;c=s;}if(b>c){s=b;b=

8、c;c=s;}printf("%d,%d,%d",a,b,c);}2.#includevoidmain(){inta,b;scanf("%d,%d",&a,&b);if(a%b==0)printf("a能被b整除");elseprintf("a不能被b整除");}3.（1）用if语句#includevoidmain(){intx,y;scanf("%d,%d",&x,&y);if(x>-5&&x<0)y=x;elseif(x==0)y=x-1;elseif(x>0&&x<10)y=x

9、+1;printf("x=%d,y=%d",x,y);}（2）用switch语句#includevoidmain(){intx,y;scanf("%d,%d",&x,&y);switch(x){case-1:case-2:case-3:case-4:y=x;break;case0:y=x-1;break;case1:case2:case3:case4:case5:case6:case7:case8:case9:y=x+1;}printf("x=%d,y=%d",x,y);}说明：本题若将区间范围改为：x(-5

10、voidmain(){intx,y;scanf("%d,%d",&