《C语言程序设计》(苏小红) 课后习题答案 高等教育出版社

2.2#include main() float x=2.5,y=2.5,z=2.5; printf(x=%fn,x); printf(y=%fn,y); printf(z=%fn,z); 3.1(1)#include main() int a=12,b=3; float x=18.5,y=4.6; printf(%dn,(float)(a*b)/2); printf(%dn,(int)x%(int)y); 3.2#include main() int x,b0,b1,b2,s; printf(Inputx:); scanf(%d, b2=x/100; b1=(x-b2*100)/10; b0=x%10; s=b0*100+b1*10+b2; printf(s=%dn,s); 3.3#include #include main() float rate=0.0225; float n,capital,deposit; printf(Input n,capital:); scanf(%f,%f, deposit=capital*pow(1+rate,n); printf(deposit=%fn,deposit); 3.4#include #include main() float a,b,c; double x,y; printf(Inputa,b,c:); scanf(%f,%f,%f, x=(-b+sqrt(b*b-4*a*c)/(2*a); y=(-b-sqrt(b*b-4*a*c)/(2*a); printf(x=%f,y=%fn,x,y); 4.1(1)#include main() char c1=a,c2=b,c3=c; printf(a%cb%cc%cn,c1,c2,c3); 4.1(2)#include main() int a=12,b=15; printf(a=%d%,b=%d%n,a,b); 4.1(3)#include main() int a,b; scanf(%2d%*2s%2d, printf(%d,%dn,a,b); 4.2#include main() long a,b; float x,y; scanf(%d,%dn, scanf(%f,%fn, printf(a=%d,b=%dn,a,b); printf(x=%f,b=%fn,x,y); 5.1#include main() float a; printf(Innputa:); scanf(%f, if(a=0) a=a; printf(a=%fn,a); else a=-a; printf(a=%fn,a); 5.2#include main() int a; printf(Inputa:); scanf(%d, if(a%2=0) printf(a 是偶数); else printf(a 是奇数); 5.3#include #include main() float a,b,c,s,area; printf(Inputa,b,c:); scanf(%f,%f,%f, if(a+bc area=(float)sqrt(s*(s-a)*(s-b)*(s-c); printf(area=%fn,area); else printf(不是三角形); 5.4#include #include main() float a,b,c,x,y; printf(Inputa,b,c:); scanf(%f,%f,%f, if(a=0) printf(该方程不是一元二次方程n); if(b*b-4*a*c0) x=(-b+sqrt(b*b-4*a*c)/(2*a); y=(-b-sqrt(b*b-4*a*c)/(2*a); printf(x=%f,y=%fn,x,y); else if(b*b-4*a*c=0) x=-b/(2*a); y=-b/(2*a); printf(x=%f,y=%fn,x,y); else printf(该方程无实根n); 5.5#include main() int year,flag; printf(Input a year:); scanf(%d, if(year%4=0 else flag=0; if(flag=1) printf(%d is a leap year !n,year); else printf(%d is not a leap year !n,year); 5.6#include main() int year,flag; printf(Input a year:); scanf(%d, flag=year%400=0|year%4=0 if(flag=1 else printf(%d is not a leap year !n,year); 5.7#include main() char ch; printf(Inputch:); scanf(%c, if(ch=a ch=ch+32; printf(%c,%dn,ch,ch); else printf(%c,ch); 5.8#include main() char ch; printf(Inputch:); scanf(%c, if(ch=48 else if(ch=32) printf(ch 是空格n); else printf(ch 是其他字符n); 5.9#include main() int score,grade; printf(Input score:); scanf(%d, grade=score/10; if(score100) printf(Input errorn); if(score=90 5.10#include main() int year,month; printf(Input year,month:); scanf(%d,%d, if(month12|month=0) printf(error monthn); else switch(year,month) case 12: case 10: case 8: case 7: case 5: case 3: case 1: printf(31 天n); break; case 11: case 9: case 6: case 4: printf(30 天n); break; case 2: if(year%4=0 else printf(28 天n); break; default: printf(Input errorn); 6.1(1)#include main() int i,j,k; char space= ; for(i=1;i=4;i+) for(j=1;j=i;j+) printf(%c,space); for(k=1;k=6;k+) printf(*); printf(n); 6.1(2)#include main() int k=4,n; for(n=0;nk;n+) if(n%2=0)continue; k-; printf(k=%dn,n=%dn,k,n); 6.1(3)#include main() int k=4,n; for(n=0;nk;n+) if(n%2=0)break; k-; printf(k=%d,n=%dn,k,n); 6.2(1)#include main() int i,sum=0; for(i=1;i=101;i+) sum=sum+i; printf(sum=%dn,sum); 6.2(2)#include main() long i; long term,sum=0; for(i=1;i=1e-5); printf(sin(x)=%f,count=%dn,sum,count); 6.3#include main() int x=1,find=0; while(!find) if(x%2=1 find=1; x+; /*int x,find=0; for (x=1;!find;x+) if(x%2=1 find=1; */ 6.4#include main() int i,n; long p=1,m=1; printf(Input n:); scanf(%d, for(i=1;i=n;i+) p=i*i; m=i*i*i; printf(p=%d,m=%dn,i,p,i,m); 6.5#include main() float c,f; for(c=-40;c0); printf(x=%dn,x); 6.7#include main() int n=0; float a=100.0,c; printf(Inputc:); scanf(%f, do a=a*(1+c); n+; while(a=1e-5) term=pow(-1,count)*(1.0/(n+2); sum=sum+term; n=n+2; count+; sum=4*sum; printf(sum=%f,count=%dn,sum,count); 6.9#include #include main() int n=1,count=1; double sum=1,term=1; while(fabs(term)=1e-5) term=term*(1.0/n); sum=sum+term; n+; count+; printf(sum=%f,count=%dn,sum,count); 6.10#include #include main() int x; for(x=100;x=999;x+) if(x=pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3) printf(x=%dn,x); 6.11#include main() int i=0,n; long sum=0,term=1; printf(Inputn:); scanf(%d, do i+; term=term*i; sum=sum+term; while(sumn); printf(%dn,i-1); 6.12#include main() int i,n,m,count=0,sum=0; printf(Input n:); scanf(%d, for(i=1;i0) sum=sum+m; count+; else break; printf(sum=%d,count=%dn,sum,count); 6.13#include main() int i,n,m,count=0,sum=0; printf(Inputn:); scanf(%d, for(i=1;i0|m0) sum=sum+m; count+; else break; printf(sum=%d,count=%dn,sum,count); 6.14#include main() int x,y,z; for(x=0;x=17;x+) for(y=0;y=25;y+) 3*x+2*y+z=50; z=30-x-y; if(3*x+2*y+z=50 6.15#include main() int x,y; for(x=0;x=98;x+) y=98-x; 2*x+4*y=386; if(x+y=98 6.16#include main() int x,y,z; for(x=0;x=20;x+) for(y=0;y=33;y+) 3*y+5*x+z/3.0=100; z=100-x-y; if (5*x+3*y+z/3.0=100 6.17#include main() int x,y,z; for(x=1;x=9;x+) for(y=1;y0) printf(x=%d,y=%d,z=%dn,x,y,z); 7.1#include int Square(int i) return i*i; int main() int i=0; i=Square(i); for( ;i3;i+) static int i=1; i+=Square(i); printf(%d,i); printf(%dn,i); return 0; 7.2#include int hour,minute,second; void update() second+; if(second=60) second=0; minute+; if(minute=60) minute=0; hour+; if(hour=24) hour=0; void display() printf(%d,%d,%dn,hour,minute,second); void delay() int t; for(t=0;t100000000;t+); int main() int i; void updaye(),display(),delay(); for(i=0;i=n) return m; else return n; 7.4#include int LCM(int n,int m); int main() int a,b; printf(Inputa,b:); scanf(%d,%d, printf(%dn,LCM(a,b); return 0; int LCM(int n,int m) int x; int find=0; for(x=1;!find;x+) if(x%n=0 return x-1; 7.5#include long Fact(int n); int main() int m,a; printf(Inputm:); scanf(%d, for(a=1;a=m;a+) printf(%d!=%ldn,a,Fact(a); return 0; long Fact(int n) int i; long result=1; for(i=2;i=n;i+) result*=i; return result; 7.6#include long Fact(int n); int main() int m; long ret; printf(Inputm:); scanf(%d, ret=Fact(m); printf(ret=%dn,ret); return 0; long Fact(int n) int i; long result=1,sum=0; for(i=2;i=n;i+) result*=i; sum=sum+result; return sum; 7.7(1)#include int Gcd(int a,int b); int main() int m,n; printf(Inputm,n:); scanf(%d,%d, printf(%dn,Gcd(m,n); return 0; int Gcd(int a,int b) int t,min,find=0; min=ab?a:b; t=min; for(t=min;!find;t-) a%t=0; b%t=0; if(a%t=0 find=1; 7.7(2)#include int Gcd(int a,int b); int main() int m,n; printf(Inputm,n:); scanf(%d,%d, printf(%dn,Gcd(m,n); return 0; int Gcd(int a,int b) int r,temp; r=a%b; if(r=0) return b; else do temp=b; b=r; a=temp; r=a%b; while(r!=0); return b; 8.1(1)#include void Func(int x) x=2; int main() int x=10; Func(x); printf(%d,x); return 0; 8.1(2)#include void Func(int b) int j; for(j=0;j4;j+) bj=j; int main() static int a=5,6,7,8,i; Func(a); for(i=0;i4;i+) printf(%d,ai); return 0; 8.2(1)int PositiveNum(int a,int n) int i,count=0; for(i=0;i0) count+; return 0; 8.2(2)void Fib(long f,long n) int i;f0=0; f1=1; for(i=2;in;i+) fi=fi-1+fi-2; 8.2(3)#include int main() int a10,n,max,min,maxPos,minPos; for(n=0;n10;n+) scanf(%d, max=min=a0; maxPos=minPos=0; for(n=0;nmax) max=an; maxPos=n; else if(anmin) min=an; minPos=n; printf(max=%d,pos=%dn,max,maxPos); printf(min=%d,pos=%dn,min,minPos); return 0; 8.3void DivArray(int *pArray,int n) int i; for(i=0;in;i+) pArrayi/=pAttay0; 8.4#include #define N 40 int FailNum(int score,int n); void ReadScore(int score,int n); int main() int scoreN,n; printf(Input n:); scanf(%d, ReadScore(score,n); FailNum(score,n); printf(FailNum students are %dn,FailNum(score,n); return 0; int FailNum(int score,int n) int i,count=0; for(i=0;in;i+) if(scorei60) count+; return count; void ReadScore(int score,int n) int i; printf(Input score:); for(i=0;in;i+) scanf(%d, 8.5#include #define N 40 int HighAver(int score,int n); int ReadScore(int score); int main() int scoreN,n; n=ReadScore(score); printf(HighAver students are %dn,HighAver(score,n); return 0; int HighAver(int score,int n) int i,count=0,sum=0,aver; for(i=0;i=0); return i; 8.6#include #define N 40 int ReadScore(int score,long num); int FindMax(int score,long num,int n); int main() int scoreN,n,max,num,t; long numN; t=FindMax(score,n); max=scoret; num=numt; printf(max=%d,num=%dn,max,num); return 0; int ReadScore(int score,long num) int i=-1; do i+; printf(Input students ID and score:); scanf(%ld%d, while(numi0 return i; int FindMax(int score,long num,int n) int max,i; max=score0; for(i=1;imax) max=scorei; return i; 8.7#include #define N 40 int Read(int a); int ChangeArry(int a,int n); int main() int aN,n; printf(%dn,ChangeArry(a,n); return 0; int Read(int a) int i; for(i=0;i9;i+) printf(Input a:); scanf(%d, return i; int ChangeArry(int a,int n) int max,min,i,maxpos,minpos,term; max=min=score0; for(i=1;imax) max=scorei; maxpos=n; else(aimin) min=ai; minpos=n; temp=maxpos; maxpos=minpos; minpos=temp; return ai; 8.10#include #define N 5 void main() int aNN; int sum = 0; int i, j; printf(请输入一个%d*%d 的矩阵n,N,N); for(i = 0; i N; i+) for(j = 0; j N; j+) scanf(%d, for(i = 0; i N; i+) for(j = 0; j N; j+) if(i = j | i + j = N - 1) sum=sum+aij; printf(对角线元素之和为：%dn,sum); 8.11#include #define N 2 #define M 3 void main() int aNM,bNM; int i,j,sum1=0,sum2=0,sum=0; printf(请输入一个%d*%d 的矩阵n,N,M); for(i = 0; iN; i+) for(j = 0; j M; j+) scanf(%d, sum1=sum1+aij; printf(请输入一个%d*%d 的矩阵n,N,M); for(i = 0; i N; i+) for(j = 0; j M; j+) scanf(%d, sum2=sum2+aij; sum=sum1+sum2; printf(sum=%dn,sum); 8.12#include #define N 7 void YangHui(int aNN,int n); void main() int i,j,n,bNN; printf(Input n:); scanf(%d, YangHui(b,n); for(i=0;in;i+) for(j=0;j=i;j+) printf(%4d,bij); printf(n); void YangHui(int aNN,int n) int i,j; for(i=0;in;i+) ai0=1; aii=1; for(i=2;in;i+) for(j=1;ji;j+) aij=ai-1j-1+ai-1j; 8.13#include #define N 12 void main() int i; int fN=1,1; printf(%d:%dn,0,f0); printf(%d:%dn,1,f1); for(i=2;iN;i+) fi=fi-1+fi-2; printf(%d:%dn,i+1,fi); 8.14#include #include #include #define N 6000 void main() int aN,i; int b1=0,b2=0,b3=0,b4=0,b5=0,b6=0; float p1,p2,p3,p4,p5,p6; srand(time(NULL); for(i=0;iN;i+) ai=rand()%6+1; printf(%3d,ai); if(ai=1) b1+; if(ai=2) b2+; if(ai=3) b3+; if(ai=4) b4+; if(ai=5) b5+; if(ai=6) b6+; p1=(float)(b1/6000.0); p2=(float)(b2/6000.0); p3=(float)(b3/6000.0); p4=(float)(b4/6000.0); p5=(float)(b5/6000.0); p6=(float)(b6/6000.0); printf(骰子出现 1 的概率：%.2fn,p1); printf(骰子出现 2 的概率：%.2fn,p2); printf(骰子出现 3 的概率：%.2fn,p3); printf(骰子出现 4 的概率：%.2fn,p4); printf(骰子出现 5 的概率：%.2fn,p5); printf(骰子出现 6 的概率：%.2fn,p6); 9.1(1)void Swap(int *x,int *y) int *pTemp;/*pTemp 未进行初始化，*pTemp 指向哪里位置 *pTemp=*x; *x=*y; *y=*pTemp; 9.1(2)void Swap(int *x,int *y) int *pTemp; pTemp=x; x=y; y=pTemp; /错误，x,y 没有指向类型 9.2#include int main() int a=1,2,3,4,5; int *p=a; printf(%d,%d,%d,%d,%d,%d,%dn,*p,*(+p),(*p)+,*p,*p-,-(*p),*p); return 0; 9.3#include void Swap(int *x,int *y); intmain() int a6=1,2,3,4,5,6,b6=11,22,33,44,55,66; int i; printf(BeforeArray n); for(i=0;i6;i+) printf( %dn,ai); for(i=0;i6;i+) printf(%dn,bi); for(i=0;i6;i+) Swap( printf(After Array n); for(i=0;i6;i+) printf(%dn,ai); for(i=0;i6;i+) printf(%dn,bi); return 0; void Swap(int *x,int *y) int temp; temp=*x; *x=*y; *y=temp; 9.4#include #define N 10 void FindMaxMin(int a,int *pMaxa,int *pMaxnum,int *pMina,int *pMinnum); intmain() int aN; int i,maxa,mina,maxnum,minnum; printf(Input a:); for(i=0;i10;i+) scanf(%d, FindMaxMin(a, printf(maxa=%d,maxnum=%d,mina=%d,minnum=%dn,maxa,maxnum,mina,minnum); return 0; void FindMaxMin(int a,int *pMaxa,int *pMaxnum,int *pMina,int *pMinnum) int i; *pMaxa=a0; *pMina=a0; *pMaxnum=0; *pMinnum=0; for(i=0;i*pMaxa) *pMaxa=ai; *pMaxnum=i; else if(ai*pMina) *pMina=ai; *pMinnum=i; 10.1void MYStrcpy(char *dstStr,const char *srcStr) while (*dstStr+=*srcStr+)!=0) 10.2#include main() char *a=main()char *a=% c% s% c; printf(a,34,a,34);printf(a,34,a,34); 10.3(1)unsigned int MyStrlen(char *p) main() unsigned int len; len=0; for(;*pa!=0;pa+) len+; return len; 10.3(2)unsigned int MyStrlen(char s) char *p=s; while(*p!=0) p+; return (p-*p); 10.3(3)int MyStrcmp(char *p1,char *p2) for(;*p1=*p2;p1+,p2+) if(*p1=0)return -1; return 1; 10.3(4)int MyStrcmp(char s,char t) int i; for(i=0;si=ti;i+) if(si=0)return 0; return i; 10.3(5)#include #include int main() char password7=secret; char userInput81; printf(Input Password:); scanf(%s,userInput); if(strcmp(userInput,password)=0) printf(Coorrect password!Welcome to the system.n); else if(strcmp(userInput,password)0) printf(Invalid pas