C语言学习知识程序设计规范标准答案.doc
!-C语言程序设计（第三版） 黄保和 江弋主编 第一到四章编程题答案2.1#include<stdio.h>#include<math.h>void main()printf("%gn",fabs(-6)+16.3*5.4);2.2#include<stdio.h>#include<math.h>main()int a,b ;printf("Input a,b:n");scanf("%d%d",&a,&b); if (a>b) printf("%gn",sqrt(a); else printf("%gn",sqrt(b);2.3#include<stdio.h> main() float a; printf("Input a:n");scanf("%g",&a); printf("the square of a=%gta cubed=%gn",a*a,a*a*a); 2.4#include<stdio.h> main() float a,b,c,d,sum; printf("Input a,b,c,d:n");scanf("%f%f%f%f",&a,&b,&c,&d); sum=a+b+c+d; printf("%fn",sum/4); 2.5#include <stdio.h>main()int n,a,b,c,d,e,s;printf("请输入一个五位数：n");scanf("%d",&n);a=n%10;b=n/10%10;c=n/100%10;d=n/1000%10;e=n/10000;s=a+b+c+d+e;printf("%dn",s);3.2#include<stdio.h>main()float r,C,S;printf("Input r :n");scanf("%f",&r);C=2*3.14159*r;S=3.141459*r*r;printf("C=%.2ftS=%.2fn",C,S);3.3#include <stdio.h>main()float f,c;printf("请输入华氏温度：n");scanf("%f",&f);c=5.0/9*(f-32);printf("摄氏温度为=%.2fn",c);3.4#include<stdio.h> #include<math.h>main()float a,b,c,S,p; printf("输入三角形的三条边长：");scanf("%f%f%f",&a,&b,&c);if(a+b>c&&b+c>a&&c+a>b)p=(a+b+c)/2;S=sqrt(p*(p-a)*(p-b)*(p-c);printf("S=%f",S);else printf("该三角形不存在n");3.5#include<stdio.h> main()printf("AAaBBn");printf("AAbBBn");printf("AAnBBn");printf("AArBBn");printf("AAtBBn");printf("AAvBBn");printf("AABBn");printf("AA"BBn");printf("AABBn");printf("AA?BBn");3.6#include<stdio.h>main()char zimu;printf("请输入小写英文字母:");scanf("%c",&zimu);zimu=zimu-32;printf("%cn",zimu);3.7#include<stdio.h>main()char a,b,c;printf("请输入两个字符:n");scanf("%ct%c",&a,&b);c=a;a=b;b=c; printf("%ct%cn",a,b);3.8#include<stdio.h>#include<math.h>main()float rate=3.25,capital,n,deposit;printf("请输入存款本金:");scanf("%f",&capital);printf("请输入存款期:");scanf("%f",&n);deposit=capital+capital*rate/100*n;printf("%lfn",deposit);3.9#include<stdio.h>#include<math.h>main()float a,b,c=9;printf("请输入该销售员的销售额:n");scanf("%f",&a);b=1000+a*c/100;printf("%fn",b);4.1#include<stdio.h>main()int a;printf("请输入一个整数:n");scanf("%d",&a);if (a%2=0)printf("%d为偶数n",a); else printf("%d为奇数n",a);4.2#include<stdio.h>main()char c; printf("请输入一个字符:n");scanf("%c",&c);if(c>=A&&c<=Z)c=c+32;printf("%cn",c);elseprintf("%cn",c);4.3#include<stdio.h>main()float a;printf("请输入一个考试分数:");scanf("%f",&a);if (a<0|a>100)printf("数据错误n");else if (a<60)printf("不及格n"); else if(a<90) printf("合格n"); else printf("优秀n");4.4#include<stdio.h>main()float a,b;printf("输入员工工作时间:n");scanf("%f",&a);if (a>=0&&a<=40)b=10*a;if (a>40)b=400+15*(a-40); printf("工资为:%fn",b);4.5#include<stdio.h>main()float a;printf("请输入一个考试分数:");scanf("%f",&a);if (a<0|a>100)printf("数据错误n");else if (a<60)printf("不及格n"); else if(a<70)printf("及格n"); else if(a<80) printf("中n"); else if(a<90) printf("良n"); else printf("优n");4.6#include<stdio.h>#include<math.h>main()float x,y;printf("Input x:n");scanf("%f",&x);if (x<=-1)y=2*x*x*x-1;if (x>-1&&x<=0)y=x*x; if(x>0&&x<=1) y=sqrt(x); if(x>1) y=3*x+2; printf("x=%ftf(x)=%fn",x,y);
