1、C语言课后习题计算调和级数之和#include #include main() double sum; int k; sum=0; for(k=1;k=10;k+) sum+=1.0/k; printf(The sum is %lfn,sum); system(PAUSE); return 0;计算阶乘之和#include #include main() int sum; int fac; int n; int counter; printf(Please enter n: ); scanf(%d,&n); fac=1; sum=0; for(counter=1;counter=n;count
2、er+) fac*=counter; sum+=fac; printf(The sum is %dn,sum); system(PAUSE); return 0;找能被7整除或含7的数#include #include main() int i; for(i=10;i100;i+) if(i%7= =0|i%10= =7|i/10= =7) printf(%4d,i); printf(n); system(PAUSE); return 0;输入整数，构造逆序数#include #include main() long n; long m; int d; printf(Please enter
3、number: ); scanf(%ld, &n); m=0; while(n!=0) d=n%10; m=m*10+d; n/=10; printf(The reverse is %ldn,m); system(PAUSE); return 0;寻找完数#include #include main() int sum; int counter; int n; for(n=2;n=10000;n+) sum=0; for(counter=1;countern;counter+) if(n%counter= =0) sum+=counter; if(sum= =n) printf(%d is a
4、 perfect numbern,n); system(PAUSE); return 0;显示三角模式#include #include #define N 5main() int r; int c; for(r=1;r=1;c-) printf( ); for(c=1;c=2*r-1;c+) printf(*); printf(n); system(PAUSE); return 0;求平均值与标准差#include #include #include #define LENGTH 10main() double arrayLENGTH; double sum; double ave; dou
5、ble dev; int i; for(i=0;iLENGTH;i+) printf(Please enter array%d: ,i); scanf(%lf,&arrayi); sum=0; for(i=0;iLENGTH;i+) sum+=arrayi; ave=sum/LENGTH; sum=0; for(i=0;iLENGTH;i+) sum+=(arrayi-ave)*(arrayi-ave); dev=sqrt(sum/LENGTH); printf(The average is %lfn,ave); printf(The standard dev is %lfn,dev); sy
6、stem(PAUSE); return 0;体操比赛实际得分#include #include #define LENGTH 7main() double arrayLENGTH; double sum; double average; double max; double min; int i; for(i=0;iLENGTH;i+) printf(Please enter array%d: ,i); scanf(%lf,&arrayi); max=array0; for(i=1;imax) max=arrayi; min=array0; for(i=1;iLENGTH;i+) if(arr
7、ayimin) min=arrayi; sum=0; for(i=0;iLENGTH;i+) sum+=arrayi; average=(sum-min-max)/(LENGTH-2); printf(The final is %lfn,average); system(PAUSE); return 0;筛选法求素数#include #include #define LENGTH 99main() int arrayLENGTH; int counter; int i; for(i=0;iLENGTH;i+) arrayi=i+2; for(i=0;iLENGTH;i+) if(arrayi!
8、=0) for(counter=i+1;counterLENGTH;counter+) if(arraycounter%arrayi= =0) arraycounter=0; for(i=0;iLENGTH;i+) if(arrayi!=0) printf(%4d,arrayi); printf(n); system(PAUSE); return 0;杨晖三角#include #include #define N 7main() int matrixNN; int row; int col; for(row=0;rowN;row+) matrixrow0=1; for(col=1;colN;c
9、ol+) matrix0col=0; for(row=1;rowN;row+) for(col=1;colN;col+) matrixrowcol=matrixrow-1col+matrixrow-1col-1; for(row=0;rowN;row+) for(col=0;colN;col+) if(matrixrowcol!=0) printf(%4d,matrixrowcol); printf(n); system(PAUSE); return 0;九宫格#include #include #define N 5main() int matrixNN; int row; int col;
10、 int counter; row=0; col=N/2; for(counter=1;counter=N*N;counter+) matrixrowcol=counter; if(counter%N= =0) row=(row+1)%N; else row=(row-1+N)%N; col=(col+1)%N; for(row=0;rowN;row+) for(col=0;colN;col+) printf(%4d,matrixrowcol); printf(n); system(PAUSE); return 0;第五章第四题#include #include int main(int ar
11、gc, char *argv) double FahToCel(double); double m; double C; printf(nplease enter the number:); scanf(%lf,&m); C=FahToCel(m); printf(nThe fahtocel is %lf,C); system(PAUSE); return 0; double FahToCel(double F) double C; C=5.00/9*(F-32); return(C); system(PAUSE); return 0;第五题#include #include int main
12、(int argc, char *argv) int HaveRealRoot(double,double,double); double a,b,c; printf(nplease enter number1:,a); scanf(%lf,&a); printf(nplease enter number2:,b); scanf(%lf,&b); printf(nplease enter number3:,c); scanf(%lf,&c); int N; N=HaveRealRoot(a,b,c); printf(nThe HaveRealRoot is %d,N); system(PAUS
13、E); return 0;int HaveRealRoot(double a,double b,double c) double result; int N; result=b*b-4*a*c; if(result=0) N=2; else N=0; return(N); system(PAUSE); return 0; 第七题#include #include #include int main(int argc, char *argv) int IsPrime(int); int c; int counter; for(counter=2;counter=200;counter+) c=I
14、sPrime(counter); if(c=1) printf(nThe prime is %d,counter); system(PAUSE); return 0;int IsPrime(int m) int i; int A; for(i=2;isqrt(m) A=1; else A=0; return(A);第十一题#include #include #define STEP 8 int main(int argc, char *argv) double AverageArray(int a,int); int aSTEP; int counter; double result; for
15、(counter=0;counterSTEP;counter+) printf(n please enter a%d:,counter); scanf(%d,&acounter); result=AverageArray(a,STEP); printf(%lf,result); system(PAUSE); return 0;double AverageArray(int a,int n) int counter; double result,sum; sum=0; for(counter=0;countern;counter+) sum+=acounter; result=sum/n; return(result);
