/*
============================================================================
Name : Factor.c
Author : moshiyou@163.com
Version :
Copyright : Your copyright notice
Description : Hello World in C, Ansi-style
============================================================================
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int octToDec(int oct){
int dec,divten,divh,divt,modten,modh,modt;
divten = oct/10;
divh = oct/100;
divt = oct/1000;
modten = oct%10;
modh = oct%100;
modt = oct%1000;
if(oct>=0 && oct<100){
if(divten >= 8 || modten>=8)
return -1;
else
dec = divten * 8 + modten;
}else if(oct>=100 && oct <1000){
if(divh>=8 || modh/10 >= 8 || modten>=8)
return -1;
else
dec = divh * 8 * 8 + (modh/10) * 8 + modten;
}else if(oct>=1000 && oct < 10000){
if(divt >= 8 || modt/100 >= 8 || modh/10 >= 8 || modten >=8)
return -1;
else
dec = divt * 8 * 8 * 8 + (modt/100)* 8 * 8 + (modh/10) * 8 + modten;
}else{
printf("请输入大于0或者小于10000的数字\n");
return -1;
}
return dec;
}
int main(int argc,char *argv[]) {
int dec,t;
printf("请输入一个数:\n");
scanf("%d",&t);
dec = octToDec(t);
if(dec==-1){
printf("输入的不是合法八进制数\n");
system("pause");
return EXIT_FAILURE;
}
printf("十进制是:%d\n",dec);
system("pause");
return EXIT_SUCCESS;
}
//主函数