#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 i){
long long s=1;
while(i!=0){
s=s*2;
i=i-1;
}
s=s-1;
return s;
}
#include <stdio.h>
long long fac(int n);
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); // 函数声明
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, m;
char a[100];
for (i = 0;x != 0;i++) {
a[i] = x%n;
x = x / n;
}
if (a[i]>9)
switch (a[i]){
case 10:a[i] = 'A';break;
case 11:a[i] = 'B';break;
case 12:a[i] = 'C';break;
case 13:a[i] = 'D';break;
case 14:a[i] = 'E';break;
case 15:a[i] = 'F';break;
}
for (m = i - 1;m >= 0;m--)
printf("%X", a[m]);
printf("\n");
}