华农C语言教材习题参考答案.docx

注：答案仅供参考分期还款：#include #include int main() double d, p,r; scanf(%lf%lf%lf,&d,&p,&r); printf(%.1f, log10(p/(p-d*r)/log10(1+r); return 0;计算分段函数函数值:#include int main() double x; scanf(%lf,&x); if(x=1 & x10) printf(%.2f, 2*x-1); else printf(%.2f, 3*x-11);成绩等级评分：#include #include int main() int score; scanf(%d, &score); if(score100 | score=90) printf(A); else if(score=80) printf(B); else if(score=70) printf(C); else if(score=60) printf(D); else printf(E); return 0;20秒后时间：#include #include int main() int h,m,s; scanf(%d:%d:%d, &h,&m,&s); s=s+20; if(s59) s=s%60; m+; if(m59) m=m%60; h+; if(h23) h=0; printf(%02d:%02d:%02dn, h, m, s); return 0;分期还款（加强版）：#include #include int main() double d, p,r; scanf(%lf%lf%lf,&d,&p,&r); if(d=0) printf(0.0n); else if(d*(1+r)-pd) printf(Godn); else printf(%.1f, log10(p/(p-d*r)/log10(1+r); return 0;字母分类统计：#include #include int main() char ch; int nL=0, nN=0, nS=0, nO=0; while(ch=getchar()!=n) if(ch=a&ch=A&ch=0&ch=9) nN+; else if (ch= ) nS+; else nO+; printf(%d %d %d %dn, nL, nN, nS, nO); return 0;计算数列和：#includemain() int i,n; double a=2,b=1,s=0; scanf(%d,&n); for(i=1;i=n;i+) s=s+a/b; a=a+b; b=a-b; printf(%.4fn,s);自由落体：#include #include int main() double sum=-100, d=100; int i,n; scanf(%d, &n); for(i=1; i=n; i+) sum+=2*d; d/=2; printf(%.3f %.3f, sum, d); return 0;迭代法求平方根：#include #include int main() double a, x0, x1=1; scanf(%lf, &a); do x0=x1; x1=1.0/2*(x1+a/x1); while(fabs(x1-x0)=1e-5); printf(%.4lfn, x1); return 0;打印三角形：#include #define abs(x) (x)=0?(x):-(x)int main() int n,i,j; scanf(%d, &n); for(i=-(n-1); i=(n-1); i+) for(j=0; jabs(i); j+) printf( ); for(j=0; jn-abs(i); j+) printf(*); printf(n); return 0;勾股数：#include #include int main() int i,j,k,n; scanf(%d, &n); for(i=1; i=n; i+) for(j=i; j=n; j+) k=(int)sqrt(i*i+j*j); if(k*k=i*i+j*j & k=0; i-) if(ain) ai+1=ai; else break;ai+1=n;输出不同的数：#includestdio.hmain() int a20; int i,t,p=0; for(i=0;i10;i+) scanf(%d,&ai); for(t=0;ti;t+) if(at=ai)break; if(t=i) printf(%dn, ai); 鞍点：#include #include int main() int i,j,a34,flag=0,col,r; for(i=0;i3;i+) for(j=0;j4;j+) scanf(%d,&aij); for(i=0;i3;i+) col=0; for(j=1;jaicol) col=j; for(j=0;j4;j+) if(aij=aicol) for(r=0;r3;r+) if(arjaij) break; if(r=3) printf(%dn, aij); flag=1; if(!flag) printf(NOn); return 0;回文串：#include stdio.h#include string.hmain() int i, j; char buf100; scanf(%s,buf); for(i=0, j=strlen(buf)-1;i=j) printf(Y); else printf(N);ASCII码值之和的差：#include int sum(char *s) int t=0,i=0; while(si!=0) t+=si+; return t;int main() char s181,s282; gets(s1); gets(s2); printf(%d, sum(s1)-sum(s2); return 0;所有数字之和：#include stdio.h int sum(int n) int ret=0; while(n0) ret+=n%10; n/=10; return ret; main() int n; scanf(%d, &n); printf(%d, sum(n); 元音字母：#include stdio.h void yuan(char *s,char *s2) while(*s!=0) if(*s=a |*s=o |*s=e |*s=i |*s=u | *s=A |*s=O |*s=E |*s=I |*s=U) *s2=*s; s2+; s+; *s2=0; main() char str81, str281; gets(str); yuan(str,str2); printf(%s, str2); 字符统计：#include #include #include int nL=0, nN=0; int statistics(char *s) int ret=0; while(*s!=0) if(*s=a&*s=A&*s=0&*s=9) nN+; else if (*s= ) ret+; s+; return ret; int main() char s81; int nS; gets(s); nS = statistics(s); printf(%d %d %dn, nL, nN, nS); return 0; 选择排序：#include int sort(int a, int n) int i,j,k,tmp; for(i=0;in-1; i+) k=i; for(j=i+1; jaj) k=j; tmp=ak;ak=ai;ai=tmp; int main() int a10; int i; for(i=0; i10; i+) scanf(%d, &ai); sort(a,10); for(i=0; i10; i+) printf(%dn, ai); return 0; x的n次方：#include int F(int x, int n) if(n=1) return x; else return F(x, n-1)*x; int main() int x, n; scanf(%d%d, &x, &n); printf(%d, F(x, n); return 0; 行列互换：#include void swap(int *a, int *b) int temp; temp=*a;*a=*b;*b=temp; void col(int a4, int i, int j) int k; for(k=0; k4; k+) swap(&aki, &akj); void row(int a4, int i, int j) int k; for(k=0; k4; k+) swap(&aik, &ajk); int main() int a44; int i,j; for(i=0; i4; i+) for(j=0; j4; j+) scanf(%d, &aij); col(a,0,2); row(a,0,2); col(a,1,3); row(a,1,3); col(a,0,3); row(a,0,3); for(i=0; i4; i+) for(j=0; j4; j+) printf(%d , aij); printf(n); return 0; 学生信息统计：#include void average(double a5, int n) int i,j;double sum; for(i=0; in; i+) sum=0; for(j=0; j5; j+) sum+=aij; printf(%.2f , sum/5); printf(n); void average2(double a5, int n) int i,j;double sum; for(j=0; j5; j+) sum=0; for(i=0; in; i+) sum+=aij; printf(%.2f , sum/n); printf(n); void top(double a5, int n) int i,j; double max; for(j=0; j5; j+) max=a0j; for(i=1; imax) max = aij; printf(%.2f , max); printf(n); int main() double a105; int i, j; for(i=0; i10; i+) for(j=0; j5; j+) scanf(%lf, &aij); average(a,10); average2(a,10); top(a,10); return 0; 一年的第几天：#include struct DATE int year;int month;int day; ; int days(struct DATE date) int day,sum;if(date.year%4=0&date.year%100!=0|date.year%400=0) day=29; elseday=28;switch(date.month)case 1:sum=0;break;case 2:sum=31;break;case 3:sum=31+day;break;case 4:sum=62+day;break;case 5:sum=92+day;break;case 6:sum=123+day;break;case 7:sum=153+day;break;case 8:sum=184+day;break;case 9:sum=215+day;break;case 10:sum=245+day;break;case 11:sum=276+day;break;case 12:sum=306+day;break;return(sum+date.day); int main() struct DATE d; scanf(%d-%d-%d, &d.year, &d.month, &d.day); printf(%d, days(d); 学生成绩表：#include struct data int num; char name20; double score3; double average; int main() int i,j; struct data stu10,tmp; for(i=0; i10; i+) scanf(%d%s%lf%lf%lf, &stui.num, , stui.score, stui.score+1, stui.sc