#include <stdio.h>
long long fun(int n);
int main() {
int n;
long long f;
while(scanf("%d", &n) != EOF) {
f = fun(n);
printf("n = %d, f = %lld\n", n, f);
}
return 0;
}
long long fun(int n){
long long s;
if(n==1)
s=1;
else
s=2*fun(n-1)+1;
return s;
#include <stdio.h>
long long fac(int n); // 函数声明
int main() {
int i,n;
printf("Enter n: ");
scanf("%d", &n);
for(i=1; i<=n; ++i)
printf("%d! = %lld\n", i, fac(i));
return 0;
}
long long fac(int n) {
static long long p = 1;
p = p*n;
return p;
}
#include<stdio.h>
int func(int, int);
int main() {
int k=4,m=1,p1,p2;
p1 = func(k,m) ;
p2 = func(k,m) ;
printf("%d,%d\n",p1,p2) ;
return 0;
}
int func(int a,int b) {
static int m=0,i=2;
i += m+1;
m = i+a+b;
return (m);
}
#include <stdio.h>
#include <stdlib.h>
#define N 1000
int fun(int n,int m,int bb[N]) {
int i,j,k=0,flag;
for(j=n;j<=m;j++) {
flag=1;
for(i=2;i<j;i++)
if(j%i==0) {
flag=0;
break;
}
if(flag==1)
bb[k++]=j;
}
return k;
}
int main(){
int n=0,m=0,i,k,bb[N];
scanf("%d",&n);
scanf("%d",&m);
for(i=0;i<m-n;i++)
bb[i]=0;
k=fun(n,m,bb);
for(i=0;i<k;i++)
printf("%4d",bb[i]);
return 0;
}
#include <stdio.h>
void dec2n(int x, int n);
int main() {
int x;
printf("输入一个十进制整数: ");
scanf("%d", &x);
dec2n(x, 2);
dec2n(x, 8);
dec2n(x, 16);
return 0;
}
void dec2n(int x, int n) {
int i = 0, a[32],b[32],c[32];
char t;
//转化为二进制
if(n==2){
while (x > 0) {
a[i] = x % 2;
i = i + 1;
x = x / 2;
}
for (i--; i >= 0; i--)
printf("%d", a[i]);
printf("\n");
}
//转化为八进制
else if(n==8){
while (x > 0) {
b[i] = x % 8;
i = i + 1;
x = x / 8;
}
for (i--; i >= 0; i--)
printf("%d", b[i]);
printf("\n");
}
//转化为十六进制
else if (n==16){
while (x > 0) {
c[i] = x % 16;
i = i + 1;
x = x / 16;
}
for (i--; i >= 0; i--){
if(c[i]>=10){
t = 'A'+c[i]-10;
printf("%c",t);
}
else
printf("%d", c[i]);
}
printf("\n");
}
}