# Share my solution with just if statement(using cpp)

• ``````class Solution {
``````

public:
bool isNumber(const char *s) {
bool flaga = 1;
bool flagb = 1;

``````    bool space = 0;
bool nospace = 0;
bool ex = 0;
bool num = 0;
bool num1 = 0;
bool minus = 1;

for (int i = 0; i < strlen (s); i ++)
{
if (s[i] <= '9' && s[i] >= '0')
num = 1;

if (s[i] == ' ' && nospace == 1)
space = 1;

if (nospace == 1 && space == 1 && s[i] != ' ')
return 0;

if (s[i] != ' ')
nospace = 1;

if ((s [i] > '9' || s [i] < '0') && s[i] != ' ')
{
if ((flaga && s[i] == '.') || (flagb && s[i] == 'e'))
{
if (num == 0 && s[i] == 'e') return 0;
if (nospace == 0)  return 0;
if (i == 0 && (s [i] == 'e' || strlen (s) == 1))  return 0;
else
{
if (s[i] == '.') flaga = 0;
if (s[i] == 'e')
{
num = 0;
flagb = 0;
flaga = 0;
ex = 1;
minus = 1;
}
}
}
else
{
if (s [i] == '-' || s [i] == '+')
{
if (minus && num == 0 && (ex == 1 || flaga == 1) )
minus = 0;
else
return 0;
}
else
return 0;
}
}

}

if (nospace == 0 || num == 0)  return 0;
else               return 1;
}
``````

};

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