C语言程序设计答案.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#includevoid main()printf(%gn,fabs(-6)+16.3*5.4);2.2#include#includemain()int a,b ;printf(Input a,b:n);scanf(%d%d,&a,&b); if (ab) printf(%gn,sqrt(a); else printf(%gn,sqrt(b);2.3#include 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 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 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#includemain()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 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 #includemain()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+bc&b+ca&c+ab)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 main()printf(AAaBBn);printf(AAbBBn);printf(AAnBBn);printf(AArBBn);printf(AAtBBn);printf(AAvBBn);printf(AABBn);printf(AABBn);printf(AABBn);printf(AA?BBn);3.6#includemain()char zimu;printf(请输入小写英文字母:);scanf(%c,&zimu);zimu=zimu-32;printf(%cn,zimu);3.7#includemain()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#includemain()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#includemain()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#includemain()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#includemain()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#includemain()float a;printf(请输入一个考试分数:);scanf(%f,&a);if (a100)printf(数据错误n);else if (a60)printf(不及格n); else if(a90) printf(合格n); else printf(优秀n);4.4#includemain()float a,b;printf(输入员工工作时间:n);scanf(%f,&a);if (a=0&a40)b=400+15*(a-40); printf(工资为:%fn,b);4.5#includemain()float a;printf(请输入一个考试分数:);scanf(%f,&a);if (a100)printf(数据错误n);else if (a60)printf(不及格n); else if(a70)printf(及格n); else if(a80) printf(中n); else if(a90) printf(良n); else printf(