十进制和任意进制的转换

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s.push()入栈

s.top()取栈顶元素

s.pop()出栈

s.empty()栈不为空

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1.十进制转换成八进制/二进制

#include<iostream>#include<stack>//#include"windows.h"using namespace std;int main(){int n;stack<int> s;scanf("%d", &n);while (n){s.push(n % 8);n = n / 8;}while (!s.empty()){printf("%d", s.top());s.pop();}//system("pause");return 0;}

主要思想：建栈->余数入栈->出栈

2.十进制转换成16进制

#include<iostream>#include<stack>//#include"windows.h"using namespace std;int main(){int n;stack<int> s;scanf("%d", &n);while (n){s.push(n % 16);n = n / 16;}while (!s.empty()){if (s.top() > 9&&s.top()<16){if (s.top() == 10) printf("A");if (s.top() == 11) printf("B");if (s.top() == 12) printf("C");if (s.top() == 13) printf("D");if (s.top() == 14) printf("E");if (s.top() == 15) printf("F");}elseprintf("%d", s.top());s.pop();}printf("\n");//system("pause");return 0;}

调用c++标准库函数进行进制转换

· sprintf(str,"%d",value)converts to decimal base.

· sprintf(str,"%x",value)converts to hexadecimal base.

· sprintf(str,"%o",value)converts to octal base.

/* itoa example */#include <stdio.h>#include <stdlib.h>#include <iostream>#include <algorithm>//#include<windows.h>using namespace std;int main(){int i;char buffer[33];printf("Enter a number: ");scanf("%d", &i);itoa(i, buffer, 10);printf("decimal: %s\n", buffer);itoa(i, buffer, 16);printf("hexadecimal小写: %s\n", buffer);transform(buffer, buffer + strlen(buffer), buffer, toupper);//转大写 toupper：将小写转换成大写，若不是字母，则返回原值printf("hexadecimal大写: %s\n", buffer);itoa(i, buffer, 2);printf("binary: %s\n", buffer);//system("pause");return 0;}

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