String Process

                    <C Base>

bool isalpha(char)     - alphabet ?   

bool isalnum(char)    - alphabet or number ?

bool isupper(char)    - capital letter ?

bool islower(char)     - small letter ?

char toupper(char)    - change to capital letter

char tolower(char)     - change to small letter      

 

int atoi(char [])

float atof(char [])

int itoa(int, char [], int radix)

int _itoa(int, char [], int radix)

int _itoa_s(int, char [], size_t bufsize, int radix)

ex)  char str[100], str2[100];

 itoa(1024, str, 10);

 str = “1024”

 str = “10000000000”

                    <C++ Base>
 

find(“str”)                   - return value : offset

find(“str”, offset)             fail – return : -1

substr(offset, count)

insert(offset, “str”)

replace(offset, count, “str”)

erase(offset, count)

c_str()

/* 들어온 입력이 PUSH면 PUSH를 출력

POP이면 POP을 출력하시오 

ex)    <In>                  <Out>

        5                         PUSH

        ABC                    PUSH

        PUSH                  POP

        PUSH

        POP                       

        DEF

*/

#include <iostream>

#include <string>

using namespace std;

int main()

{

int n;

string s;

cin >> n;

while(n--)

{

cin >> s;

if(s==string("PUSH"))

cout << s << endl;

else if(s==string("POP"))

cout << s << endl;

}

return 0;

}