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("%g\n",fabs(-6)+16.3*5.4);}2.2#include#includemain(){int a,b ;printf("Input a,b:\n");scanf("%d%d",&a,&b); if (a>b) printf("%g\n",sqrt(a)); else printf("%g\n",sqrt(b));}2.3#include main() { float a; printf("Input a:\n");scanf("%g",&a); printf("the square of a=%g\ta cubed=%g\n",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("%f\n",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("%d\n",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=%.2f\tS=%.2f\n",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=%.2f\n",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+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 main(){printf("AA\aBB\n");printf("AA\bBB\n");printf("AA\nBB\n");printf("AA\rBB\n");printf("AA\tBB\n");printf("AA\vBB\n");printf("AA\'BB\n");printf("AA\"BB\n");printf("AA\\BB\n");printf("AA\?BB\n");}3.6#includemain(){char zimu;printf("请输入小写英文字母:");scanf("%c",&zimu);zimu=zimu-32;printf("%c\n",zimu);}3.7#includemain(){char a,b,c;printf("请输入两个字符:\n");scanf("%c\t%c",&a,&b);{c=a;a=b;b=c;} printf("%c\t%c\n",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("%lf\n",deposit);}3.9#include
