Created
July 19, 2018 18:06
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| class Solution { | |
| public: | |
| int myAtoi(string str) { | |
| int ans=0; | |
| int p=0; | |
| if(str.length()==0) | |
| return 0; | |
| char sign=' '; | |
| for(int i=0;i<str.length();i++) | |
| { | |
| bool bf=false; | |
| while(i<str.length()&&str[i]!='+'&&str[i]!='-'&&!isdigit(str[i])) i++; | |
| if(i+1<str.length()&&str[i]=='+'&&isdigit(str[i+1])) | |
| { | |
| sign='+'; | |
| i++; | |
| } | |
| if(i+1<str.length()&&str[i]=='-'&&isdigit(str[i+1])) | |
| { | |
| sign='-'; | |
| i++; | |
| } | |
| while(i<str.length()&&isdigit(str[i])) | |
| { | |
| if(ans==INT_MAX/10) | |
| return INT_MAX; | |
| if(ans>INT_MAX/10) | |
| return INT_MIN; | |
| if(ans<INT_MIN/10) | |
| return INT_MAX; | |
| ans=(ans*10)+int(str[i]-'0'); | |
| cout<<ans<<endl; | |
| cout<<str[i]-'0'<<endl; | |
| i++; | |
| if(!isdigit(str[i])) | |
| { | |
| bf=true; | |
| break; | |
| } | |
| p++; | |
| } | |
| if(bf) break; | |
| } | |
| if(!isdigit(str[0])&&str[0]!='-'&&str[0]!=' '&&str[0]!='+') | |
| return 0; | |
| if(str.length()>1&&(str[0]=='+'||str[0]=='-')&&!isdigit(str[1])) | |
| return 0; | |
| if(sign=='-') | |
| return -ans; | |
| return ans; | |
| } | |
| }; |
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