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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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void fac(int n){
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int i;
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unsigned long long res=1;
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for(i=1; i<=n; i++){
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res*=i;
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}
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printf("%d!=%llu",n,res);
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}//n的阶乘
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void judge_prime(int n){
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int i;
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int k=sqrt(n);
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for(i=2; i<=k; i++){
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if(n%i==0){
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break;
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}
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}
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if(i>k){
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printf("This is prime!");
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}else{
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printf("This is not prime!");
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}
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} //判断素数
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void V_sphere(int r){
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printf("The volume of the ball is%f",(4*r*r*r)/3.0);
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}//球的体积
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long long fic(int n){
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long long y;
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if(n==1||n==2){
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y=1;
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}else{
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y=fic(n-1)+fic(n-2);
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}
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return y;
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}//求斐波那契数列的第n项值
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/*double index1(int x,int n){
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int i;
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double result;
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if(n=0){
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result=1;
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}else if(n>0){
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for(i=0; i<n; i++){
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result*=x;
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}
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}else{
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result=1/index(-x,n);
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}
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return result;
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}//求x的n次方*/
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int GCD(int a, int b){
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int t;
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while(a%b){
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t=b;
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b=a%b;
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a=b;
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}
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return b;
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}//求最大公约数
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void LCM(int a, int b){
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int i;
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int t,loc=0;
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if(a>b){
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t=a;
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a=b;
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b=t;
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}
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for(i=2; i<=a; i++){
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if(a%i==0&&b%i==0){
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printf("%d与%d的最小公倍数为%d",a,b,i);
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loc=1;
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break;
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}
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}
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if(loc==0){
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printf("%d与%d的最小公倍数为1",a,b);
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}
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}//求最小公倍数
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void swap(int *a,int *b){
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int t;
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t=*a;
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*a=*b;
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*b=t;
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}//交换两个数的值
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void sort(int a[],int len){
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int i,j,t;
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for(i=0; i<len; i++){
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for(j=i+1; j<len; j++){
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if(a[i]>a[j]){
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t=a[i];
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a[i]=a[j];
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a[j]=t;
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}
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}
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}
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}//数组从小到大排序
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int main(int argc, char *argv[]) {
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int n;
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int a[1000000];
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int k,i;
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int x1,x2;
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long long y;
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double z;
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printf("请输入你要进行的运算：\n");
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printf("1.四则运算\n");
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printf("2.求模运算\n");
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printf("3.求n的阶乘\n");
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printf("4.判断素数\n");
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printf("5.求半径为n的球的体积\n");
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printf("6.求斐波那契数列的第n项值\n");
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printf("7.求x的n次方\n");
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printf("8.求两个数最大的公约数\n");
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printf("9.求两个数的最小公倍数\n");
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printf("10.交换两个数\n");
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printf("11.对输入的n个数排序\n");
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scanf("%d",&n);
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switch(n){
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case 1:
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printf("请选择你要进行的运算方式\n");
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printf("1.加法\n");
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printf("2.减法\n");
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printf("3.乘法\n");
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printf("4.除法\n");
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scanf("%d",&k);
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if(k==1){
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printf("请输入两个加数：\n");
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scanf("%d%d",&x1,&x2);
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printf("%d+%d=%d\n",x1,x2,x1+x2);
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}else if(k==2){
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printf("请输入被减数与减数：\n");
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scanf("%d%d",&x1,&x2);
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printf("%d-%d=%d\n",x1,x2,x1-x2);
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}else if(k==3){
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printf("请输入两个乘数：\n");
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scanf("%d%d",&x1,&x2);
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printf("%d*%d=%d\n",x1,x2,x1*x2);
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}else if(k==4){
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out:
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printf("请输入被除数与除数：\n");
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scanf("%d%d",&x1,&x2);
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if(x2==0){
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printf("输入错误,无法计算,请重新输入\n");
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goto out;
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}else{
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printf("%d÷%d=%f\n",x1,x2,x1/(double)x2);
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}
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}
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break;
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case 2:
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printf("请输入取模的两个数：\n");
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scanf("%d%d",&x1,&x2);
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printf("%d%%%d=%d\n",x1,x2,x1%x2);
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break;
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case 3:
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printf("请输入要求阶乘的数字：\n");
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scanf("%d",&x1);
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fac(x1);
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break;
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case 4:
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printf("请输入数字：\n");
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scanf("%d",&x1);
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judge_prime(x1);
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break;
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case 5:
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printf("请输入半径：\n");
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scanf("%d",&x1);
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V_sphere(x1);
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break;
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case 6:
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printf("请问需要求斐波那契数列的第几项值：\n");
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scanf("%d",&x1);
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y=fic(x1);
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printf("斐波那契数列的第%d项值为%lld",x1,y);
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break;
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case 7:
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printf("请依次输入x和n的值：\n");
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scanf("%d%d",&x1,&x2);
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//z=index1(x1,x2);
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z=pow(x1,x2);
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printf("%d的%d次方为%f",x1,x2,z);
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break;
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case 8:
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printf("请输入两个数：\n");
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scanf("%d%d",&x1,&x2);
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y=GCD(x1,x2);
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printf("%d和%d最大公约数为%lld",x1,x2,y);
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break;
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case 9:
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printf("请输入两个数：\n");
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scanf("%d%d",&x1,&x2);
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LCM(x1,x2);
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break;
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case 10:
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printf("请输入需要交换的两个数：\n");
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scanf("%d%d",&x1,&x2);
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swap(&x1,&x2);
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printf("%d %d",x1,x2);
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break;
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case 11:
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printf("请问需要对几个数进行排序：\n");
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scanf("%d",&k);
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printf("请输入这些数字并用空格隔开：\n");
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for(i=0; i<k; i++){
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scanf("%d",&a[i]);
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}
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sort(a,k);
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printf("排序完成，输出为：\n");
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for(i=0; i<k; i++){
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printf("%d ",a[i]);
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}
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break;
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}
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printf("\n");
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printf("运算完毕.");
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return 0;
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}
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