《C语言程序设计》苏小红课后习题答案高等教育出版社.pdf

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 printf(“Inputch:“); scanf(“%c“, if(ch=48 printf(“Input score:“); scanf(“%d“, grade=score/10; if(score100) printf(“Input errorn“); if(score=90 printf(“Input year,month:“); scanf(“%d,%d“, if(month12|month main() int i,j,k; char space= ; for(i=1;i main() int k=4,n; for(n=0;n main() int k=4,n; for(n=0;n main() int i,sum=0; for(i=1;i main() long i; long term,sum=0; for(i=1;i #include main() int n=1; float term=1.0,sign=1,sum=0; while(term=1e-4) term=1.0/sign; sum=sum+term; sign=sign+n; n+; printf(“sum=%fn“,sum); 6.2(5)#include #include main() int n=1,count=1; float x; double sum,term; printf(“Input x:“); scanf(“%f“, sum=x; term=x; do term=-term*x*x/(n+1)*(n+2); sum=sum+term; n=n+2; count+; while(fabs(term)=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 main() float c,f; for(c=-40;c #include main() int n; double c=0.01875,x; do x=x*pow(1+c,12)-1000; n+; while(x0); 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 #include main() int n=1,count=1; double sum=1,term=1; while(fabs(term)=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 main() int i=0,n; long sum=0,term=1; printf(“Inputn:“); scanf(“%d“, do i+; term=term*i; sum=sum+term; while(sum 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|m main() int x,y,z; for(x=0;x main() int x,y; for(x=0;x main() int x,y,z; for(x=0;x main() int x,y,z; for(x=1;x0) 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( ;i 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;t int GetMax(int a,int b); int main() int x,y,max; printf(“Inputx,y:“); scanf(“%d,%d“, max=GetMax(x,y); printf(“max=%dn“,max); return 0; int GetMax(int m,int n) if(m=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 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 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=a 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;j0) count+; return 0; 8.2(2)void Fib(long f,long n) int i;f0=0; f1=1; for(i=2;i int main() int a10,n,max,min,maxPos,minPos; for(n=0;nmax) max=an; maxPos=n; else if(an #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;i #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;iaver) count+; return count; int ReadScore(int score) int i=-1; do i+; printf(“Input score:“); scanf(“%d“, while(scorei=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;imax) max=scorei; maxpos=n; else(ai #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 #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; i #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;i #define N 12 void main() int i; int fN=1,1; printf(“%d:%dn“,0,f0); printf(“%d:%dn“,1,f1); for(i=2;i #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;i 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;i #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;i*pMaxa) *pMaxa=ai; *pMaxnum=i; else if(ai 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)password.n“); return 0; 10.4#include #define N 24 unsigned int CountLetter(char str); int main() char aN; printf(“Input a letter:n“); gets(a); printf(“The length of the letter is:%dn“,CountLetter(a); return 0; unsigned intCountLetter(char str) char *p=str; int c=0,flag=0; while(*p!=0) if(*p!= ) flag=1; else if(flag=1) c+; flag=0; p+; return c+1