cpp1.cpp

五、 进制转换器（10）（方法 2） 要求：（1）可输入二进制、八进制、十进制、十六进制数； （2）将已输入的数转换成其余进制的数； （3）具有输入输出界面

#include <stdio.h> 
#include <string.h> 
#include <math.h> 

void menu(); 
int BinToBex(char str[100],int b); 
char * BexToBTH(int n,int b); 

int main() 
{ 
int x; 

menu(); 
while (1) 
{ 
do 
{ 
printf(" ☆★输入1-12的序号,选择你要转换的方式,输入0退出★☆\n您输入的是:"); 
scanf("%d",&x); 
if(x>12||x<0) 
printf("请看清楚序号是1-12哦→再给你一次机会\n"); 
}while(x>12||x<0); 


char str[100]; 
int n; 


switch(x) 
{ 
case 1: 
printf("Please input a binary number:"); 
scanf("%s",str); 
n=BinToBex(str,2); 
printf("转换后的数字为:%s\n",BexToBTH(n,8)); 
break; 
case 2: 
printf("Please input a binary number:"); 
scanf("%s",str); 
printf("转换后的数字为:%d\n",BinToBex(str,2)); 
break; 
case 3: 
printf("Please input a binary number:"); 
scanf("%s",str); 
n=BinToBex(str,2); 
printf("转换后的数字为:%s\n",BexToBTH(n,16)); 
break; 
case 4: 
printf("Please input a number:"); 
scanf("%d",&n); 
printf("转换后的数字为:%s\n",BexToBTH(n,2)); 
break; 
case 5: 
printf("Please input a number:"); 
scanf("%d",&n); 
printf("转换后的数字为:%s\n",BexToBTH(n,8)); 
break; 
case 6: 
printf("Please input a number:"); 
scanf("%d",&n); 
printf("转换后的数字为:%s\n",BexToBTH(n,16)); 
break; 
case 7: 
printf("Please input a binary number:"); 
scanf("转换后的数字为:%s",str); 
n=BinToBex(str,8); 
printf("转换后的数字为:%s\n",BexToBTH(n,2)); 
break; 
case 8: 
printf("Please input a binary number:"); 
scanf("%s",str); 
printf("转换后的数字为:%d\n",BinToBex(str,8)); 
break; 
case 9: 
printf("Please input a binary number:"); 
scanf("%s",str); 
n=BinToBex(str,8); 
printf("转换后的数字为:%s\n",BexToBTH(n,16)); 
break; 
case 10: 
printf("Please input a binary number:"); 
scanf("%s",str); 
n=BinToBex(str,16); 
printf("转换后的数字为:%s\n",BexToBTH(n,2)); 
break; 
case 11: 
printf("Please input a binary number:"); 
scanf("%s",str); 
n=BinToBex(str,16); 
printf("转换后的数字为:%s\n",BexToBTH(n,8)); 
break; 
case 12: 
printf("Please input a binary number:"); 
scanf("%s",str); 
printf("转换后的数字为:%d\n",BinToBex(str,16)); 
break; 
case 0: return 1; 
} 

} 
return 1; 
} 


void menu() 
{ 
printf ("============================Welcome you!======================================="); 
printf(" 1:二进制转换为八进制 ★ 4:十进制转换为二进制\n"); 
printf(" 2:二进制转换为十进制 ☆☆ 5:十进制转换为八进制\n"); 
printf(" 3:二进制转换为十六进制 ★☆★ 6:十进制转换为十六进制\n"); 
printf("================================================================================"); 
printf(" 7:八进制转换为二进制 ★☆★ 10:十六进制转换为二进制\n"); 
printf(" 8:八进制转换为十进制 ☆☆ 11:十六进制转换为八进制\n"); 
printf(" 9:八进制转换为十六进制 ★ 12:十六进制转换为十进制\n"); 
printf ("=======================press 0:exit the program!================================"); 
} 

int BinToBex(char str[100],int b) 
{ 
int i,sum=0,lenstr; 

lenstr=strlen(str); 

for(i=0;i<lenstr;i++) 
{ 
sum+=(str[i]-'0')*(int)(pow(b,lenstr-1-i)); 
} 
return sum; 
} 

char * BexToBTH(int n,int b) 
{ 
int i,len; 
char str[100]; 

for(i=0;n!=0;i++) 
{ 
str[i]=n%b+48; 
if (str[i]>'9') str[i]=str[i]-'9'-1+'a'; 
n/=b; 
} 
str[i]=0; 
len=strlen(str); 

for(i=0;i<len/2;i++) 
{ 
str[i]^=str[len-1]^=str[i]^=str[len-1]; 
} 

return str; 
}