C语言程序设计：数据的输入与输出单元测试与答案

一、单选题1printf("a\rHappi\by")A.HappyB.aHappiC.aHappyD.Happi正确答案：A2、以下程序的输出结果是（intmain(){floatinti;i=(int)x;printf("x=%f,i=%d\n",x,i);return0;}A.x=3.600000,i=3B.x=3.600000,i=4C.x=3i=3.600000D.x=3,i=3正确答案：A3、已定义doublea;int选择正确的输入格式为（ ）。A.scanf("%6lf%3d",&a,&i);B.scanf("%6.2f%3d",&a,&i);C.scanf("%lf%s",&a,&i);D.scanf("%f%d",a,i);正确答案：A4、已有定义chars1,s2;，下面正确的语句是（ A.scanf("%s%c",s1,&s2);B.scanf("%c%c",s1,s2);C.scanf("%s%c",s1,s2);D.scanf("%c%c",&s1,&s2);正确答案：D5、运行下面的程序，正确的输出结果是（#include<stdio.h>intmain(){doublex=68.7563,y=-789.127;printf("%f,%10.2f\n",x,y);return0;}A.68.756300,□□□-789.13B.68.75,□□□-789.13C.68.75,-789.12D.68.756300,□□□-789.12A6、已知float段是（。x=2.230000,y=4.350000y+x=6.58,y-x=2.12A.printf("x=%8.6f,y=%8.6f\n",x,y);printf("y+x=%4.2f,y-x=%4.2f\n",y+x,y-x);B.printf("x=%8.2f,y=%8.2f",x,y);printf("y+x=%4.2f,y-x=%4.2f\n",y+x,y-x);C.printf("x=%7.2f,y=%7.2f\n",x,y);printf("y+x=%3.2f,y=%3.2f\n",y+x,y-x);D.printf("x=%f,y=%f\n",&x,&y);printf("y+x=%f,y=%f\n",y+x,y-x);二、判断题1、C函数完成。正确答案：√2正确答案：×3ASCIIASCII数通用。正确答案：√4、程序的顺序结构是指按照解决问题的顺序写出相应的语句，程序执行顺序按照自上而下，依次按顺序执行。正确答案：√三、填空题1、下列语句输出的结果charch='b';printf("%c,%d",ch,ch);正确答案：b,982scanfa=2,b='x',c='z'#include<stdio.h>intmain(){inta,b;scanf("%d%c",&a,&bprintf(" return0;}正确答案：a=%d,b='%c',c='%c'3、下面程序的运行结果是：

。#include<stdio.h>intmain(){charstr=65;printf("str=%c,ASCII=%d",str,str);return0;}正确答案：st