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String2Integer.cpp

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class Solution {

public:

int atoi(const char *str) {

int index=0;

long long ret=0;

bool numBegin=false;

bool isNegative=false;

bool isOutflow=false;

while(str[index]!='\0')

{

if(!numBegin)

{

if(str[index]!= ' ')

{

if(str[index] == '+')

{

numBegin=true;

}

else if(str[index]== '-')

{

numBegin=true;

isNegative=true;

}

else if(str[index]>= '0' && str[index]<= '9')

{

numBegin=true;

ret=str[index]-'0';

}

else

{

break;

}

}

}

else

{

if (str[index]>= '0' && str[index]<= '9')

{

ret=ret*10+(str[index]-'0');

if(ret>INT_MAX)

{

isOutflow=true;

break;

}

}

else

{

break;

}

}

index++;

}

if(isOutflow)

{

if(isNegative)

{

return INT_MIN;

}

else

{

return INT_MAX;

}

}

else

{

if(isNegative)

{

return ret*(-1);

}

else

{

return ret;

}

}

}

};