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1、参考答案第一章【1-1】.exe【1-2】.c.obj.exe【1-3】顺序，分枝（选择），循环第二章【2-1】B【2-2】D【2-3】B【2-4】A【2-5】C【2-6】A【2-7】B【2-8】B【2-9】A【2-10】C【2-11】B【2-12】B【2-13】A【2-14】11，12【2-15】4.2，4.2【2-16】{,},定义说明,执行语句【2-17】关键字,用户标识符【2-18】int,float,double【2-19】floata1=1，a2=1;【2-20】存贮单元【2-21】
2、3.5【2-22】a*b/c,a/c*b,b/c*a【2-23】把10赋予变量s【2-24】bit,0/1【2-25】8,127,01111111,-128,10000000(补码)【2-26】32767,-32768,1111111111111111,1000000000000000【2-27】8,10,16【2-28-1】(错误)#includestdio.h;main()/*mainfunction*/floatr,s;/*/*risradius*/,/*sisareaofcircular
3、*/*/r=5.0;s=3.14159*r*r;printf("%f",s)【2-28-2】(正确)#includestdio.h;main()/*mainfunction*/{floatr,s;/*risradius,sisareaofcircular*/r=5.0;s=3.14159*r*r;printf("%f",s);}【2-29-1】(错误)#includestdio.hmain/*mainfunction*/{floata,b,c,v;/*a,b,caresides,visv
4、olumeofcube*/a=2.0;b=3.0;c=4.0v=a*b*c;printf("%f",v)}【2-29-2】(正确)#includemain()/*mainfunction*/{floata,b,c,v;/*a,b,caresides,visvolumeofcube*/a=2.0;b=3.0;c=4.0;v=a*b*c;printf("%f",v);}第三章【3-1】C【3-2】C【3-3】D【3-4】C【3-5】D【3-6】B【3-7】C【3-8】D【3
5、-9】A【3-10】B【3-11】C【3-12】D【3-13】D【3-14】A【3-15】C【3-16】C【3-17】C【3-18】A【3-19】C【3-20】B【3-21】(1)-2002500(2)i=-200,j=2500(3)i=-200//(换行)j=2500【3-22】12,0,0【3-23】一条语句,;【3-24】;【3-25】10025.811.89234,100//25.81//1.89234,100//25.811.89234【3-26】x=127,x=127,x=177,x
6、=7f,x=127【3-27】x=127,x=127,x=$127,x=$000127,x=%06d【3-28】a=513.789215,a=513.79,a=513.78921500,a=513.78921500【3-29-1】(错误)main{doublea,b,c,s,v;printf(inputa,b,c:);scanf("%d%d%d",a,b,c);s=a*b;v=a*b*c;printf("%d%d%d",a,b,c);printf("s=%f",s,"v=%d",v)
7、;}【3-29-2】(正确)main(){floata,b,c,s,v;printf("inputa,b,c:");scanf("%f%f%f:",&a,&b,&c);s=a*b;v=a*b*c;printf("a=%f,b=%f,c=%f",a,b,c);printf("s=%f,v=%f",s,v);}【3-30】main(){inth,m;h=560/60;m=560%60;printf("%dh:%dm",h,m);}【3-31】main(){intm,n;printf("inp
8、utm&n:");scanf("%d%d",&m,&n);printf("%d,%d",m/n,m%n);}【3-32】main(){doublex,y,z,s;printf("inputx,y,z:");scanf("%lf%lf%lf",&x,&y,&z);s=(x+y+z)/3.0;printf("Average=%6.1lf",s);}【3-33】main(){inta,b,c,t;printf("Inputa,b,c:");scanf("%d%d%d",&a,&b,&c
