[Ybt] [String processing class example 1] Number flip

Digital flip

Topic link: digital flip

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Title description

Problem solving ideas

Determine whether the number is negative.

Remove leading $0$。

code

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;

int ok;
char c[11];

int main()
{
    
    
	cin>>c;
	if(c[0]=='-')
	{
    
    
		printf("-");
		int i=strlen(c)-1;
		while(c[i]=='0') i--;
		for(;i>0;i--)
			cout<<c[i];
	}
	else
	{
    
    
		int i=strlen(c)-1;
		while(c[i]=='0') i--;
		for(;i>=0;i--)
			cout<<c[i];
	}
}